Add cross builtins and cross HLSL function to DirectX and SPIR-V backend #109180

bob80905 · 2024-09-18T19:21:45Z

This PR adds the step intrinsic and an HLSL function that uses it.
The SPIRV backend is also implemented.

Used #106471 as a reference.
Fixes #99095

llvmbot · 2024-09-18T19:22:19Z

@llvm/pr-subscribers-backend-spir-v
@llvm/pr-subscribers-llvm-ir
@llvm/pr-subscribers-hlsl
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-backend-directx

Author: Joshua Batista (bob80905)

Changes

This PR adds the step intrinsic and an HLSL function that uses it.
The SPIRV backend is also implemented.

Used #106471 as a reference.
Fixes #99095

Full diff: https://github.com/llvm/llvm-project/pull/109180.diff

13 Files Affected:

(modified) clang/include/clang/Basic/Builtins.td (+6)
(modified) clang/lib/CodeGen/CGBuiltin.cpp (+15)
(modified) clang/lib/CodeGen/CGHLSLRuntime.h (+1)
(modified) clang/lib/Headers/hlsl/hlsl_intrinsics.h (+22)
(modified) clang/lib/Sema/SemaHLSL.cpp (+14)
(added) clang/test/CodeGenHLSL/builtins/cross.hlsl (+36)
(added) clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl (+31)
(modified) llvm/include/llvm/IR/IntrinsicsDirectX.td (+1)
(modified) llvm/include/llvm/IR/IntrinsicsSPIRV.td (+1)
(modified) llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp (+40)
(modified) llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp (+23-1)
(added) llvm/test/CodeGen/DirectX/cross.ll (+57)
(added) llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll (+33)

diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
index 8c5d7ad763bf97..c4735b59dfb0be 100644
--- a/clang/include/clang/Basic/Builtins.td
+++ b/clang/include/clang/Basic/Builtins.td
@@ -4709,6 +4709,12 @@ def HLSLCreateHandle : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void*(unsigned char)";
 }
 
+def HLSLCross: LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_cross"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void(...)";
+}
+
 def HLSLDotProduct : LangBuiltin<"HLSL_LANG"> {
   let Spellings = ["__builtin_hlsl_dot"];
   let Attributes = [NoThrow, Const];
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 7e18aafcdd4b8a..0883ad17ce0ffd 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -18639,6 +18639,21 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned BuiltinID,
         IsUnsigned ? Intrinsic::dx_uclamp : Intrinsic::dx_clamp,
         ArrayRef<Value *>{OpX, OpMin, OpMax}, nullptr, "dx.clamp");
   }
+  case Builtin::BI__builtin_hlsl_cross: {
+    Value *Op0 = EmitScalarExpr(E->getArg(0));
+    Value *Op1 = EmitScalarExpr(E->getArg(1));
+    assert(E->getArg(0)->getType()->hasFloatingRepresentation() &&
+           E->getArg(1)->getType()->hasFloatingRepresentation() &&
+           "step operands must have a float representation");
+    // make sure each vector has exactly 3 elements
+    auto *XVecTy1 = E->getArg(0)->getType()->getAs<VectorType>();
+    auto *XVecTy2 = E->getArg(1)->getType()->getAs<VectorType>();
+    assert(XVecTy1->getNumElements() == 3 && XVecTy2->getNumElements() == 3 &&
+           "input vectors must have 3 elements each");
+    return Builder.CreateIntrinsic(
+        /*ReturnType=*/Op0->getType(), CGM.getHLSLRuntime().getCrossIntrinsic(),
+        ArrayRef<Value *>{Op0, Op1}, nullptr, "hlsl.cross");
+  }
   case Builtin::BI__builtin_hlsl_dot: {
     Value *Op0 = EmitScalarExpr(E->getArg(0));
     Value *Op1 = EmitScalarExpr(E->getArg(1));
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.h b/clang/lib/CodeGen/CGHLSLRuntime.h
index a8aabca7348ffb..6722d2c7c50a2b 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.h
+++ b/clang/lib/CodeGen/CGHLSLRuntime.h
@@ -74,6 +74,7 @@ class CGHLSLRuntime {
 
   GENERATE_HLSL_INTRINSIC_FUNCTION(All, all)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Any, any)
+  GENERATE_HLSL_INTRINSIC_FUNCTION(Cross, cross)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Frac, frac)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Length, length)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Lerp, lerp)
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 6cd6a2caf19994..e4b40978dea6b9 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -1563,6 +1563,28 @@ uint64_t3 reversebits(uint64_t3);
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_bitreverse)
 uint64_t4 reversebits(uint64_t4);
 
+//===----------------------------------------------------------------------===//
+// cross builtins
+//===----------------------------------------------------------------------===//
+
+/// \fn T cross(T x, T y)
+/// \brief Returns the cross product of two floating-point, 3D vectors.
+/// \param x [in] The first floating-point, 3D vector.
+/// \param y [in] The second floating-point, 3D vector.
+///
+/// Result is the cross product of x and y, i.e., the resulting
+/// components are, in order :
+/// x[1] * y[2] - y[1] * x[2]
+/// x[2] * y[0] - y[2] * x[0]
+/// x[0] * y[1] - y[0] * x[1]
+
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_cross)
+half3 cross(half3, half3);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_cross)
+float3 cross(float3, float3);
+
 //===----------------------------------------------------------------------===//
 // rcp builtins
 //===----------------------------------------------------------------------===//
diff --git a/clang/lib/Sema/SemaHLSL.cpp b/clang/lib/Sema/SemaHLSL.cpp
index a303f211501348..e7e7a3c259e27a 100644
--- a/clang/lib/Sema/SemaHLSL.cpp
+++ b/clang/lib/Sema/SemaHLSL.cpp
@@ -1704,6 +1704,20 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_cross: {
+    if (SemaRef.checkArgCount(TheCall, 2))
+      return true;
+    if (CheckVectorElementCallArgs(&SemaRef, TheCall))
+      return true;
+    if (CheckFloatOrHalfRepresentations(&SemaRef, TheCall))
+      return true;
+
+    ExprResult A = TheCall->getArg(0);
+    QualType ArgTyA = A.get()->getType();
+    // return type is the same as the input type
+    TheCall->setType(ArgTyA);
+    break;
+  }
   case Builtin::BI__builtin_hlsl_dot: {
     if (SemaRef.checkArgCount(TheCall, 2))
       return true;
diff --git a/clang/test/CodeGenHLSL/builtins/cross.hlsl b/clang/test/CodeGenHLSL/builtins/cross.hlsl
new file mode 100644
index 00000000000000..047e7fef7136fe
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/cross.hlsl
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF \
+// RUN:   -DFNATTRS=noundef -DTARGET=dx
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF \
+// RUN:   -DFNATTRS=noundef -DTARGET=dx
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF \
+// RUN:   -DFNATTRS="spir_func noundef" -DTARGET=spv
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF \
+// RUN:   -DFNATTRS="spir_func noundef" -DTARGET=spv
+
+// NATIVE_HALF: define [[FNATTRS]] <3 x half> @
+// NATIVE_HALF: call <3 x half> @llvm.[[TARGET]].cross.v3f16(<3 x half>
+// NO_HALF: call <3 x float> @llvm.[[TARGET]].cross.v3f32(<3 x float>
+// NATIVE_HALF: ret <3 x half> %hlsl.cross
+// NO_HALF: ret <3 x float> %hlsl.cross
+half3 test_cross_half3(half3 p0, half3 p1)
+{
+    return cross(p0, p1);
+}
+
+// CHECK: define [[FNATTRS]] <3 x float> @
+// CHECK: %hlsl.cross = call <3 x float> @llvm.[[TARGET]].cross.v3f32(
+// CHECK: ret <3 x float> %hlsl.cross
+float3 test_cross_float3(float3 p0, float3 p1)
+{
+    return cross(p0, p1);
+}
diff --git a/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl b/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl
new file mode 100644
index 00000000000000..40ab4b533a495e
--- /dev/null
+++ b/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -disable-llvm-passes -verify -verify-ignore-unexpected
+
+void test_too_few_arg()
+{
+  return __builtin_hlsl_cross();
+  // expected-error@-1 {{too few arguments to function call, expected 2, have 0}}
+}
+
+void test_too_many_arg(float3 p0)
+{
+  return __builtin_hlsl_cross(p0, p0, p0);
+  // expected-error@-1 {{too many arguments to function call, expected 2, have 3}}
+}
+
+bool builtin_bool_to_float_type_promotion(bool p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {passing 'bool' to parameter of incompatible type 'float'}}
+}
+
+bool builtin_cross_int_to_float_promotion(int p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {{passing 'int' to parameter of incompatible type 'float'}}
+}
+
+bool2 builtin_cross_int2_to_float2_promotion(int2 p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {{passing 'int2' (aka 'vector<int, 2>') to parameter of incompatible type '__attribute__((__vector_size__(2 * sizeof(float)))) float' (vector of 2 'float' values)}}
+}
diff --git a/llvm/include/llvm/IR/IntrinsicsDirectX.td b/llvm/include/llvm/IR/IntrinsicsDirectX.td
index 3ce7b8b987ef86..f4242772bab20c 100644
--- a/llvm/include/llvm/IR/IntrinsicsDirectX.td
+++ b/llvm/include/llvm/IR/IntrinsicsDirectX.td
@@ -44,6 +44,7 @@ def int_dx_cast_handle : Intrinsic<[llvm_any_ty], [llvm_any_ty]>;
 def int_dx_all : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_any : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_clamp : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
+def int_dx_cross : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
 def int_dx_uclamp : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
 def int_dx_saturate : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>], [IntrNoMem]>;
 
diff --git a/llvm/include/llvm/IR/IntrinsicsSPIRV.td b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
index a4c01952927175..480b391bd54fdf 100644
--- a/llvm/include/llvm/IR/IntrinsicsSPIRV.td
+++ b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
@@ -60,6 +60,7 @@ let TargetPrefix = "spv" in {
       Intrinsic<[ llvm_ptr_ty ], [llvm_i8_ty], [IntrWillReturn]>;
   def int_spv_all : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty]>;
   def int_spv_any : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty]>;
+  def int_spv_cross : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
   def int_spv_frac : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty]>;
   def int_spv_lerp : Intrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty, LLVMMatchType<0>,LLVMMatchType<0>],
     [IntrNoMem, IntrWillReturn] >;
diff --git a/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp b/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
index dd73b895b14d37..e921dffede38f8 100644
--- a/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
+++ b/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
@@ -43,6 +43,7 @@ static bool isIntrinsicExpansion(Function &F) {
   case Intrinsic::dx_all:
   case Intrinsic::dx_any:
   case Intrinsic::dx_clamp:
+  case Intrinsic::dx_cross:
   case Intrinsic::dx_uclamp:
   case Intrinsic::dx_lerp:
   case Intrinsic::dx_length:
@@ -73,6 +74,42 @@ static Value *expandAbs(CallInst *Orig) {
                                  "dx.max");
 }
 
+static Value *expandCrossIntrinsic(CallInst *Orig) {
+
+  VectorType *VT = cast<VectorType>(Orig->getType());
+  if (cast<FixedVectorType>(VT)->getNumElements() != 3)
+    report_fatal_error(Twine("return vector must have exactly 3 elements"),
+                       /* gen_crash_diag=*/false);
+
+  Value *op0 = Orig->getOperand(0);
+  Value *op1 = Orig->getOperand(1);
+  IRBuilder<> Builder(Orig);
+
+  Value *op0_x = Builder.CreateExtractElement(op0, (uint64_t)0);
+  Value *op0_y = Builder.CreateExtractElement(op0, 1);
+  Value *op0_z = Builder.CreateExtractElement(op0, 2);
+
+  Value *op1_x = Builder.CreateExtractElement(op1, (uint64_t)0);
+  Value *op1_y = Builder.CreateExtractElement(op1, 1);
+  Value *op1_z = Builder.CreateExtractElement(op1, 2);
+
+  auto MulSub = [&](Value *x0, Value *y0, Value *x1, Value *y1) -> Value * {
+    Value *xy = Builder.CreateFMul(x0, y1);
+    Value *yx = Builder.CreateFMul(y0, x1);
+    return Builder.CreateFSub(xy, yx);
+  };
+
+  Value *yz_zy = MulSub(op0_y, op0_z, op1_y, op1_z);
+  Value *zx_xz = MulSub(op0_z, op0_x, op1_z, op1_x);
+  Value *xy_yx = MulSub(op0_x, op0_y, op1_x, op1_y);
+
+  Value *cross = UndefValue::get(VT);
+  cross = Builder.CreateInsertElement(cross, yz_zy, (uint64_t)0);
+  cross = Builder.CreateInsertElement(cross, zx_xz, 1);
+  cross = Builder.CreateInsertElement(cross, xy_yx, 2);
+  return cross;
+}
+
 // Create appropriate DXIL float dot intrinsic for the given A and B operands
 // The appropriate opcode will be determined by the size of the operands
 // The dot product is placed in the position indicated by Orig
@@ -434,6 +471,9 @@ static bool expandIntrinsic(Function &F, CallInst *Orig) {
   case Intrinsic::dx_any:
     Result = expandAnyOrAllIntrinsic(Orig, IntrinsicId);
     break;
+  case Intrinsic::dx_cross:
+    Result = expandCrossIntrinsic(Orig);
+    break;
   case Intrinsic::dx_uclamp:
   case Intrinsic::dx_clamp:
     Result = expandClampIntrinsic(Orig, IntrinsicId);
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index b526c9f29f1e6a..677119840709aa 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -167,7 +167,8 @@ class SPIRVInstructionSelector : public InstructionSelector {
 
   bool selectCmp(Register ResVReg, const SPIRVType *ResType,
                  unsigned comparisonOpcode, MachineInstr &I) const;
-
+  bool selectCross(Register ResVReg, const SPIRVType *ResType,
+                   MachineInstr &I) const;
   bool selectICmp(Register ResVReg, const SPIRVType *ResType,
                   MachineInstr &I) const;
   bool selectFCmp(Register ResVReg, const SPIRVType *ResType,
@@ -1465,6 +1466,25 @@ bool SPIRVInstructionSelector::selectAny(Register ResVReg,
   return selectAnyOrAll(ResVReg, ResType, I, SPIRV::OpAny);
 }
 
+bool SPIRVInstructionSelector::selectCross(Register ResVReg,
+                                           const SPIRVType *ResType,
+                                           MachineInstr &I) const {
+
+  assert(I.getNumOperands() == 4);
+  assert(I.getOperand(2).isReg());
+  assert(I.getOperand(3).isReg());
+  MachineBasicBlock &BB = *I.getParent();
+
+  return BuildMI(BB, I, I.getDebugLoc(), TII.get(SPIRV::OpExtInst))
+      .addDef(ResVReg)
+      .addUse(GR.getSPIRVTypeID(ResType))
+      .addImm(static_cast<uint32_t>(SPIRV::InstructionSet::GLSL_std_450))
+      .addImm(GL::Cross)
+      .addUse(I.getOperand(2).getReg())
+      .addUse(I.getOperand(3).getReg())
+      .constrainAllUses(TII, TRI, RBI);
+}
+
 bool SPIRVInstructionSelector::selectFmix(Register ResVReg,
                                           const SPIRVType *ResType,
                                           MachineInstr &I) const {
@@ -2458,6 +2478,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
     return selectAll(ResVReg, ResType, I);
   case Intrinsic::spv_any:
     return selectAny(ResVReg, ResType, I);
+  case Intrinsic::spv_cross:
+    return selectCross(ResVReg, ResType, I);
   case Intrinsic::spv_lerp:
     return selectFmix(ResVReg, ResType, I);
   case Intrinsic::spv_length:
diff --git a/llvm/test/CodeGen/DirectX/cross.ll b/llvm/test/CodeGen/DirectX/cross.ll
new file mode 100644
index 00000000000000..90847ac635dbba
--- /dev/null
+++ b/llvm/test/CodeGen/DirectX/cross.ll
@@ -0,0 +1,57 @@
+; RUN: opt -S  -dxil-intrinsic-expansion  < %s | FileCheck %s --check-prefix=CHECK
+; RUN: opt -S  -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library < %s | FileCheck %s --check-prefix=CHECK
+
+; Make sure dxil operation function calls for cross are generated for half/float.
+
+declare <3 x half> @llvm.dx.cross.v3f16(<3 x half>, <3 x half>)
+declare <3 x float> @llvm.dx.cross.v3f32(<3 x float>, <3 x float>)
+
+define noundef <3 x half> @test_cross_half3(<3 x half> noundef %p0, <3 x half> noundef %p1) {
+entry:
+  ; CHECK: %0 = extractelement <3 x half> %p0, i64 0
+  ; CHECK: %1 = extractelement <3 x half> %p0, i64 1
+  ; CHECK: %2 = extractelement <3 x half> %p0, i64 2
+  ; CHECK: %3 = extractelement <3 x half> %p1, i64 0
+  ; CHECK: %4 = extractelement <3 x half> %p1, i64 1
+  ; CHECK: %5 = extractelement <3 x half> %p1, i64 2
+  ; CHECK: %6 = fmul half %1, %5
+  ; CHECK: %7 = fmul half %2, %4
+  ; CHECK: %8 = fsub half %6, %7
+  ; CHECK: %9 = fmul half %2, %3
+  ; CHECK: %10 = fmul half %0, %5
+  ; CHECK: %11 = fsub half %9, %10
+  ; CHECK: %12 = fmul half %0, %4
+  ; CHECK: %13 = fmul half %1, %3
+  ; CHECK: %14 = fsub half %12, %13
+  ; CHECK: %15 = insertelement <3 x half> undef, half %8, i64 0
+  ; CHECK: %16 = insertelement <3 x half> %15, half %11, i64 1
+  ; CHECK: %17 = insertelement <3 x half> %16, half %14, i64 2
+  ; CHECK: ret <3 x half> %17
+  %hlsl.cross = call <3 x half> @llvm.dx.cross.v3f16(<3 x half> %p0, <3 x half> %p1)
+  ret <3 x half> %hlsl.cross
+}
+
+define noundef <3 x float> @test_cross_float3(<3 x float> noundef %p0, <3 x float> noundef %p1) {
+entry:
+  ; CHECK: %0 = extractelement <3 x float> %p0, i64 0
+  ; CHECK: %1 = extractelement <3 x float> %p0, i64 1
+  ; CHECK: %2 = extractelement <3 x float> %p0, i64 2
+  ; CHECK: %3 = extractelement <3 x float> %p1, i64 0
+  ; CHECK: %4 = extractelement <3 x float> %p1, i64 1
+  ; CHECK: %5 = extractelement <3 x float> %p1, i64 2
+  ; CHECK: %6 = fmul float %1, %5
+  ; CHECK: %7 = fmul float %2, %4
+  ; CHECK: %8 = fsub float %6, %7
+  ; CHECK: %9 = fmul float %2, %3
+  ; CHECK: %10 = fmul float %0, %5
+  ; CHECK: %11 = fsub float %9, %10
+  ; CHECK: %12 = fmul float %0, %4
+  ; CHECK: %13 = fmul float %1, %3
+  ; CHECK: %14 = fsub float %12, %13
+  ; CHECK: %15 = insertelement <3 x float> undef, float %8, i64 0
+  ; CHECK: %16 = insertelement <3 x float> %15, float %11, i64 1
+  ; CHECK: %17 = insertelement <3 x float> %16, float %14, i64 2
+  ; CHECK: ret <3 x float> %17
+  %hlsl.cross = call <3 x float> @llvm.dx.cross.v3f32(<3 x float> %p0, <3 x float> %p1)
+  ret <3 x float> %hlsl.cross
+}
diff --git a/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll
new file mode 100644
index 00000000000000..2e0eb8c429ac27
--- /dev/null
+++ b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll
@@ -0,0 +1,33 @@
+; RUN: llc -O0 -mtriple=spirv-unknown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - -filetype=obj | spirv-val %}
+
+; Make sure SPIRV operation function calls for cross are lowered correctly.
+
+; CHECK-DAG: %[[#op_ext_glsl:]] = OpExtInstImport "GLSL.std.450"
+; CHECK-DAG: %[[#float_32:]] = OpTypeFloat 32
+; CHECK-DAG: %[[#float_16:]] = OpTypeFloat 16
+; CHECK-DAG: %[[#vec3_float_16:]] = OpTypeVector %[[#float_16]] 3
+; CHECK-DAG: %[[#vec3_float_32:]] = OpTypeVector %[[#float_32]] 3
+
+define noundef <3 x half> @cross_half4(<3 x half> noundef %a, <3 x half> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec3_float_16]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec3_float_16]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec3_float_16]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec3_float_16]] %[[#op_ext_glsl]] Cross %[[#arg0]] %[[#arg1]]
+  %hlsl.cross = call <3 x half> @llvm.spv.cross.v4f16(<3 x half> %a, <3 x half> %b)
+  ret <3 x half> %hlsl.cross
+}
+
+define noundef <3 x float> @cross_float4(<3 x float> noundef %a, <3 x float> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec3_float_32]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec3_float_32]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec3_float_32]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec3_float_32]] %[[#op_ext_glsl]] Cross %[[#arg0]] %[[#arg1]]
+  %hlsl.cross = call <3 x float> @llvm.spv.cross.v4f32(<3 x float> %a, <3 x float> %b)
+  ret <3 x float> %hlsl.cross
+}
+
+declare <3 x half> @llvm.spv.cross.v4f16(<3 x half>, <3 x half>)
+declare <3 x float> @llvm.spv.cross.v4f32(<3 x float>, <3 x float>)

llvmbot · 2024-09-18T19:22:20Z

@llvm/pr-subscribers-clang-codegen

Author: Joshua Batista (bob80905)

Changes

This PR adds the step intrinsic and an HLSL function that uses it.
The SPIRV backend is also implemented.

Used #106471 as a reference.
Fixes #99095

Full diff: https://github.com/llvm/llvm-project/pull/109180.diff

13 Files Affected:

(modified) clang/include/clang/Basic/Builtins.td (+6)
(modified) clang/lib/CodeGen/CGBuiltin.cpp (+15)
(modified) clang/lib/CodeGen/CGHLSLRuntime.h (+1)
(modified) clang/lib/Headers/hlsl/hlsl_intrinsics.h (+22)
(modified) clang/lib/Sema/SemaHLSL.cpp (+14)
(added) clang/test/CodeGenHLSL/builtins/cross.hlsl (+36)
(added) clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl (+31)
(modified) llvm/include/llvm/IR/IntrinsicsDirectX.td (+1)
(modified) llvm/include/llvm/IR/IntrinsicsSPIRV.td (+1)
(modified) llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp (+40)
(modified) llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp (+23-1)
(added) llvm/test/CodeGen/DirectX/cross.ll (+57)
(added) llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll (+33)

diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
index 8c5d7ad763bf97..c4735b59dfb0be 100644
--- a/clang/include/clang/Basic/Builtins.td
+++ b/clang/include/clang/Basic/Builtins.td
@@ -4709,6 +4709,12 @@ def HLSLCreateHandle : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void*(unsigned char)";
 }
 
+def HLSLCross: LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_cross"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void(...)";
+}
+
 def HLSLDotProduct : LangBuiltin<"HLSL_LANG"> {
   let Spellings = ["__builtin_hlsl_dot"];
   let Attributes = [NoThrow, Const];
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 7e18aafcdd4b8a..0883ad17ce0ffd 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -18639,6 +18639,21 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned BuiltinID,
         IsUnsigned ? Intrinsic::dx_uclamp : Intrinsic::dx_clamp,
         ArrayRef<Value *>{OpX, OpMin, OpMax}, nullptr, "dx.clamp");
   }
+  case Builtin::BI__builtin_hlsl_cross: {
+    Value *Op0 = EmitScalarExpr(E->getArg(0));
+    Value *Op1 = EmitScalarExpr(E->getArg(1));
+    assert(E->getArg(0)->getType()->hasFloatingRepresentation() &&
+           E->getArg(1)->getType()->hasFloatingRepresentation() &&
+           "step operands must have a float representation");
+    // make sure each vector has exactly 3 elements
+    auto *XVecTy1 = E->getArg(0)->getType()->getAs<VectorType>();
+    auto *XVecTy2 = E->getArg(1)->getType()->getAs<VectorType>();
+    assert(XVecTy1->getNumElements() == 3 && XVecTy2->getNumElements() == 3 &&
+           "input vectors must have 3 elements each");
+    return Builder.CreateIntrinsic(
+        /*ReturnType=*/Op0->getType(), CGM.getHLSLRuntime().getCrossIntrinsic(),
+        ArrayRef<Value *>{Op0, Op1}, nullptr, "hlsl.cross");
+  }
   case Builtin::BI__builtin_hlsl_dot: {
     Value *Op0 = EmitScalarExpr(E->getArg(0));
     Value *Op1 = EmitScalarExpr(E->getArg(1));
diff --git a/clang/lib/CodeGen/CGHLSLRuntime.h b/clang/lib/CodeGen/CGHLSLRuntime.h
index a8aabca7348ffb..6722d2c7c50a2b 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.h
+++ b/clang/lib/CodeGen/CGHLSLRuntime.h
@@ -74,6 +74,7 @@ class CGHLSLRuntime {
 
   GENERATE_HLSL_INTRINSIC_FUNCTION(All, all)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Any, any)
+  GENERATE_HLSL_INTRINSIC_FUNCTION(Cross, cross)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Frac, frac)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Length, length)
   GENERATE_HLSL_INTRINSIC_FUNCTION(Lerp, lerp)
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 6cd6a2caf19994..e4b40978dea6b9 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -1563,6 +1563,28 @@ uint64_t3 reversebits(uint64_t3);
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_bitreverse)
 uint64_t4 reversebits(uint64_t4);
 
+//===----------------------------------------------------------------------===//
+// cross builtins
+//===----------------------------------------------------------------------===//
+
+/// \fn T cross(T x, T y)
+/// \brief Returns the cross product of two floating-point, 3D vectors.
+/// \param x [in] The first floating-point, 3D vector.
+/// \param y [in] The second floating-point, 3D vector.
+///
+/// Result is the cross product of x and y, i.e., the resulting
+/// components are, in order :
+/// x[1] * y[2] - y[1] * x[2]
+/// x[2] * y[0] - y[2] * x[0]
+/// x[0] * y[1] - y[0] * x[1]
+
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_cross)
+half3 cross(half3, half3);
+
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_cross)
+float3 cross(float3, float3);
+
 //===----------------------------------------------------------------------===//
 // rcp builtins
 //===----------------------------------------------------------------------===//
diff --git a/clang/lib/Sema/SemaHLSL.cpp b/clang/lib/Sema/SemaHLSL.cpp
index a303f211501348..e7e7a3c259e27a 100644
--- a/clang/lib/Sema/SemaHLSL.cpp
+++ b/clang/lib/Sema/SemaHLSL.cpp
@@ -1704,6 +1704,20 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
       return true;
     break;
   }
+  case Builtin::BI__builtin_hlsl_cross: {
+    if (SemaRef.checkArgCount(TheCall, 2))
+      return true;
+    if (CheckVectorElementCallArgs(&SemaRef, TheCall))
+      return true;
+    if (CheckFloatOrHalfRepresentations(&SemaRef, TheCall))
+      return true;
+
+    ExprResult A = TheCall->getArg(0);
+    QualType ArgTyA = A.get()->getType();
+    // return type is the same as the input type
+    TheCall->setType(ArgTyA);
+    break;
+  }
   case Builtin::BI__builtin_hlsl_dot: {
     if (SemaRef.checkArgCount(TheCall, 2))
       return true;
diff --git a/clang/test/CodeGenHLSL/builtins/cross.hlsl b/clang/test/CodeGenHLSL/builtins/cross.hlsl
new file mode 100644
index 00000000000000..047e7fef7136fe
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/cross.hlsl
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF \
+// RUN:   -DFNATTRS=noundef -DTARGET=dx
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF \
+// RUN:   -DFNATTRS=noundef -DTARGET=dx
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF \
+// RUN:   -DFNATTRS="spir_func noundef" -DTARGET=spv
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF \
+// RUN:   -DFNATTRS="spir_func noundef" -DTARGET=spv
+
+// NATIVE_HALF: define [[FNATTRS]] <3 x half> @
+// NATIVE_HALF: call <3 x half> @llvm.[[TARGET]].cross.v3f16(<3 x half>
+// NO_HALF: call <3 x float> @llvm.[[TARGET]].cross.v3f32(<3 x float>
+// NATIVE_HALF: ret <3 x half> %hlsl.cross
+// NO_HALF: ret <3 x float> %hlsl.cross
+half3 test_cross_half3(half3 p0, half3 p1)
+{
+    return cross(p0, p1);
+}
+
+// CHECK: define [[FNATTRS]] <3 x float> @
+// CHECK: %hlsl.cross = call <3 x float> @llvm.[[TARGET]].cross.v3f32(
+// CHECK: ret <3 x float> %hlsl.cross
+float3 test_cross_float3(float3 p0, float3 p1)
+{
+    return cross(p0, p1);
+}
diff --git a/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl b/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl
new file mode 100644
index 00000000000000..40ab4b533a495e
--- /dev/null
+++ b/clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl
@@ -0,0 +1,31 @@
+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -disable-llvm-passes -verify -verify-ignore-unexpected
+
+void test_too_few_arg()
+{
+  return __builtin_hlsl_cross();
+  // expected-error@-1 {{too few arguments to function call, expected 2, have 0}}
+}
+
+void test_too_many_arg(float3 p0)
+{
+  return __builtin_hlsl_cross(p0, p0, p0);
+  // expected-error@-1 {{too many arguments to function call, expected 2, have 3}}
+}
+
+bool builtin_bool_to_float_type_promotion(bool p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {passing 'bool' to parameter of incompatible type 'float'}}
+}
+
+bool builtin_cross_int_to_float_promotion(int p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {{passing 'int' to parameter of incompatible type 'float'}}
+}
+
+bool2 builtin_cross_int2_to_float2_promotion(int2 p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {{passing 'int2' (aka 'vector<int, 2>') to parameter of incompatible type '__attribute__((__vector_size__(2 * sizeof(float)))) float' (vector of 2 'float' values)}}
+}
diff --git a/llvm/include/llvm/IR/IntrinsicsDirectX.td b/llvm/include/llvm/IR/IntrinsicsDirectX.td
index 3ce7b8b987ef86..f4242772bab20c 100644
--- a/llvm/include/llvm/IR/IntrinsicsDirectX.td
+++ b/llvm/include/llvm/IR/IntrinsicsDirectX.td
@@ -44,6 +44,7 @@ def int_dx_cast_handle : Intrinsic<[llvm_any_ty], [llvm_any_ty]>;
 def int_dx_all : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_any : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_clamp : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
+def int_dx_cross : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
 def int_dx_uclamp : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
 def int_dx_saturate : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>], [IntrNoMem]>;
 
diff --git a/llvm/include/llvm/IR/IntrinsicsSPIRV.td b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
index a4c01952927175..480b391bd54fdf 100644
--- a/llvm/include/llvm/IR/IntrinsicsSPIRV.td
+++ b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
@@ -60,6 +60,7 @@ let TargetPrefix = "spv" in {
       Intrinsic<[ llvm_ptr_ty ], [llvm_i8_ty], [IntrWillReturn]>;
   def int_spv_all : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty]>;
   def int_spv_any : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty]>;
+  def int_spv_cross : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
   def int_spv_frac : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty]>;
   def int_spv_lerp : Intrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty, LLVMMatchType<0>,LLVMMatchType<0>],
     [IntrNoMem, IntrWillReturn] >;
diff --git a/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp b/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
index dd73b895b14d37..e921dffede38f8 100644
--- a/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
+++ b/llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp
@@ -43,6 +43,7 @@ static bool isIntrinsicExpansion(Function &F) {
   case Intrinsic::dx_all:
   case Intrinsic::dx_any:
   case Intrinsic::dx_clamp:
+  case Intrinsic::dx_cross:
   case Intrinsic::dx_uclamp:
   case Intrinsic::dx_lerp:
   case Intrinsic::dx_length:
@@ -73,6 +74,42 @@ static Value *expandAbs(CallInst *Orig) {
                                  "dx.max");
 }
 
+static Value *expandCrossIntrinsic(CallInst *Orig) {
+
+  VectorType *VT = cast<VectorType>(Orig->getType());
+  if (cast<FixedVectorType>(VT)->getNumElements() != 3)
+    report_fatal_error(Twine("return vector must have exactly 3 elements"),
+                       /* gen_crash_diag=*/false);
+
+  Value *op0 = Orig->getOperand(0);
+  Value *op1 = Orig->getOperand(1);
+  IRBuilder<> Builder(Orig);
+
+  Value *op0_x = Builder.CreateExtractElement(op0, (uint64_t)0);
+  Value *op0_y = Builder.CreateExtractElement(op0, 1);
+  Value *op0_z = Builder.CreateExtractElement(op0, 2);
+
+  Value *op1_x = Builder.CreateExtractElement(op1, (uint64_t)0);
+  Value *op1_y = Builder.CreateExtractElement(op1, 1);
+  Value *op1_z = Builder.CreateExtractElement(op1, 2);
+
+  auto MulSub = [&](Value *x0, Value *y0, Value *x1, Value *y1) -> Value * {
+    Value *xy = Builder.CreateFMul(x0, y1);
+    Value *yx = Builder.CreateFMul(y0, x1);
+    return Builder.CreateFSub(xy, yx);
+  };
+
+  Value *yz_zy = MulSub(op0_y, op0_z, op1_y, op1_z);
+  Value *zx_xz = MulSub(op0_z, op0_x, op1_z, op1_x);
+  Value *xy_yx = MulSub(op0_x, op0_y, op1_x, op1_y);
+
+  Value *cross = UndefValue::get(VT);
+  cross = Builder.CreateInsertElement(cross, yz_zy, (uint64_t)0);
+  cross = Builder.CreateInsertElement(cross, zx_xz, 1);
+  cross = Builder.CreateInsertElement(cross, xy_yx, 2);
+  return cross;
+}
+
 // Create appropriate DXIL float dot intrinsic for the given A and B operands
 // The appropriate opcode will be determined by the size of the operands
 // The dot product is placed in the position indicated by Orig
@@ -434,6 +471,9 @@ static bool expandIntrinsic(Function &F, CallInst *Orig) {
   case Intrinsic::dx_any:
     Result = expandAnyOrAllIntrinsic(Orig, IntrinsicId);
     break;
+  case Intrinsic::dx_cross:
+    Result = expandCrossIntrinsic(Orig);
+    break;
   case Intrinsic::dx_uclamp:
   case Intrinsic::dx_clamp:
     Result = expandClampIntrinsic(Orig, IntrinsicId);
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index b526c9f29f1e6a..677119840709aa 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -167,7 +167,8 @@ class SPIRVInstructionSelector : public InstructionSelector {
 
   bool selectCmp(Register ResVReg, const SPIRVType *ResType,
                  unsigned comparisonOpcode, MachineInstr &I) const;
-
+  bool selectCross(Register ResVReg, const SPIRVType *ResType,
+                   MachineInstr &I) const;
   bool selectICmp(Register ResVReg, const SPIRVType *ResType,
                   MachineInstr &I) const;
   bool selectFCmp(Register ResVReg, const SPIRVType *ResType,
@@ -1465,6 +1466,25 @@ bool SPIRVInstructionSelector::selectAny(Register ResVReg,
   return selectAnyOrAll(ResVReg, ResType, I, SPIRV::OpAny);
 }
 
+bool SPIRVInstructionSelector::selectCross(Register ResVReg,
+                                           const SPIRVType *ResType,
+                                           MachineInstr &I) const {
+
+  assert(I.getNumOperands() == 4);
+  assert(I.getOperand(2).isReg());
+  assert(I.getOperand(3).isReg());
+  MachineBasicBlock &BB = *I.getParent();
+
+  return BuildMI(BB, I, I.getDebugLoc(), TII.get(SPIRV::OpExtInst))
+      .addDef(ResVReg)
+      .addUse(GR.getSPIRVTypeID(ResType))
+      .addImm(static_cast<uint32_t>(SPIRV::InstructionSet::GLSL_std_450))
+      .addImm(GL::Cross)
+      .addUse(I.getOperand(2).getReg())
+      .addUse(I.getOperand(3).getReg())
+      .constrainAllUses(TII, TRI, RBI);
+}
+
 bool SPIRVInstructionSelector::selectFmix(Register ResVReg,
                                           const SPIRVType *ResType,
                                           MachineInstr &I) const {
@@ -2458,6 +2478,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
     return selectAll(ResVReg, ResType, I);
   case Intrinsic::spv_any:
     return selectAny(ResVReg, ResType, I);
+  case Intrinsic::spv_cross:
+    return selectCross(ResVReg, ResType, I);
   case Intrinsic::spv_lerp:
     return selectFmix(ResVReg, ResType, I);
   case Intrinsic::spv_length:
diff --git a/llvm/test/CodeGen/DirectX/cross.ll b/llvm/test/CodeGen/DirectX/cross.ll
new file mode 100644
index 00000000000000..90847ac635dbba
--- /dev/null
+++ b/llvm/test/CodeGen/DirectX/cross.ll
@@ -0,0 +1,57 @@
+; RUN: opt -S  -dxil-intrinsic-expansion  < %s | FileCheck %s --check-prefix=CHECK
+; RUN: opt -S  -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library < %s | FileCheck %s --check-prefix=CHECK
+
+; Make sure dxil operation function calls for cross are generated for half/float.
+
+declare <3 x half> @llvm.dx.cross.v3f16(<3 x half>, <3 x half>)
+declare <3 x float> @llvm.dx.cross.v3f32(<3 x float>, <3 x float>)
+
+define noundef <3 x half> @test_cross_half3(<3 x half> noundef %p0, <3 x half> noundef %p1) {
+entry:
+  ; CHECK: %0 = extractelement <3 x half> %p0, i64 0
+  ; CHECK: %1 = extractelement <3 x half> %p0, i64 1
+  ; CHECK: %2 = extractelement <3 x half> %p0, i64 2
+  ; CHECK: %3 = extractelement <3 x half> %p1, i64 0
+  ; CHECK: %4 = extractelement <3 x half> %p1, i64 1
+  ; CHECK: %5 = extractelement <3 x half> %p1, i64 2
+  ; CHECK: %6 = fmul half %1, %5
+  ; CHECK: %7 = fmul half %2, %4
+  ; CHECK: %8 = fsub half %6, %7
+  ; CHECK: %9 = fmul half %2, %3
+  ; CHECK: %10 = fmul half %0, %5
+  ; CHECK: %11 = fsub half %9, %10
+  ; CHECK: %12 = fmul half %0, %4
+  ; CHECK: %13 = fmul half %1, %3
+  ; CHECK: %14 = fsub half %12, %13
+  ; CHECK: %15 = insertelement <3 x half> undef, half %8, i64 0
+  ; CHECK: %16 = insertelement <3 x half> %15, half %11, i64 1
+  ; CHECK: %17 = insertelement <3 x half> %16, half %14, i64 2
+  ; CHECK: ret <3 x half> %17
+  %hlsl.cross = call <3 x half> @llvm.dx.cross.v3f16(<3 x half> %p0, <3 x half> %p1)
+  ret <3 x half> %hlsl.cross
+}
+
+define noundef <3 x float> @test_cross_float3(<3 x float> noundef %p0, <3 x float> noundef %p1) {
+entry:
+  ; CHECK: %0 = extractelement <3 x float> %p0, i64 0
+  ; CHECK: %1 = extractelement <3 x float> %p0, i64 1
+  ; CHECK: %2 = extractelement <3 x float> %p0, i64 2
+  ; CHECK: %3 = extractelement <3 x float> %p1, i64 0
+  ; CHECK: %4 = extractelement <3 x float> %p1, i64 1
+  ; CHECK: %5 = extractelement <3 x float> %p1, i64 2
+  ; CHECK: %6 = fmul float %1, %5
+  ; CHECK: %7 = fmul float %2, %4
+  ; CHECK: %8 = fsub float %6, %7
+  ; CHECK: %9 = fmul float %2, %3
+  ; CHECK: %10 = fmul float %0, %5
+  ; CHECK: %11 = fsub float %9, %10
+  ; CHECK: %12 = fmul float %0, %4
+  ; CHECK: %13 = fmul float %1, %3
+  ; CHECK: %14 = fsub float %12, %13
+  ; CHECK: %15 = insertelement <3 x float> undef, float %8, i64 0
+  ; CHECK: %16 = insertelement <3 x float> %15, float %11, i64 1
+  ; CHECK: %17 = insertelement <3 x float> %16, float %14, i64 2
+  ; CHECK: ret <3 x float> %17
+  %hlsl.cross = call <3 x float> @llvm.dx.cross.v3f32(<3 x float> %p0, <3 x float> %p1)
+  ret <3 x float> %hlsl.cross
+}
diff --git a/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll
new file mode 100644
index 00000000000000..2e0eb8c429ac27
--- /dev/null
+++ b/llvm/test/CodeGen/SPIRV/hlsl-intrinsics/cross.ll
@@ -0,0 +1,33 @@
+; RUN: llc -O0 -mtriple=spirv-unknown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - -filetype=obj | spirv-val %}
+
+; Make sure SPIRV operation function calls for cross are lowered correctly.
+
+; CHECK-DAG: %[[#op_ext_glsl:]] = OpExtInstImport "GLSL.std.450"
+; CHECK-DAG: %[[#float_32:]] = OpTypeFloat 32
+; CHECK-DAG: %[[#float_16:]] = OpTypeFloat 16
+; CHECK-DAG: %[[#vec3_float_16:]] = OpTypeVector %[[#float_16]] 3
+; CHECK-DAG: %[[#vec3_float_32:]] = OpTypeVector %[[#float_32]] 3
+
+define noundef <3 x half> @cross_half4(<3 x half> noundef %a, <3 x half> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec3_float_16]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec3_float_16]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec3_float_16]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec3_float_16]] %[[#op_ext_glsl]] Cross %[[#arg0]] %[[#arg1]]
+  %hlsl.cross = call <3 x half> @llvm.spv.cross.v4f16(<3 x half> %a, <3 x half> %b)
+  ret <3 x half> %hlsl.cross
+}
+
+define noundef <3 x float> @cross_float4(<3 x float> noundef %a, <3 x float> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec3_float_32]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec3_float_32]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec3_float_32]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec3_float_32]] %[[#op_ext_glsl]] Cross %[[#arg0]] %[[#arg1]]
+  %hlsl.cross = call <3 x float> @llvm.spv.cross.v4f32(<3 x float> %a, <3 x float> %b)
+  ret <3 x float> %hlsl.cross
+}
+
+declare <3 x half> @llvm.spv.cross.v4f16(<3 x half>, <3 x half>)
+declare <3 x float> @llvm.spv.cross.v4f32(<3 x float>, <3 x float>)

farzonl · 2024-09-20T19:31:43Z

clang/lib/CodeGen/CGBuiltin.cpp

+    Value *Op1 = EmitScalarExpr(E->getArg(1));
+    assert(E->getArg(0)->getType()->hasFloatingRepresentation() &&
+           E->getArg(1)->getType()->hasFloatingRepresentation() &&
+           "step operands must have a float representation");


Suggested change

"step operands must have a float representation");

"cross operands must have a float representation");

farzonl · 2024-09-20T19:34:57Z

llvm/include/llvm/IR/IntrinsicsDirectX.td

@@ -44,6 +44,7 @@ def int_dx_cast_handle : Intrinsic<[llvm_any_ty], [llvm_any_ty]>;
 def int_dx_all : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_any : DefaultAttrsIntrinsic<[llvm_i1_ty], [llvm_any_ty], [IntrNoMem]>;
 def int_dx_clamp : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
+def int_dx_cross : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;


I think you are trying to keep this alphabetical, but don't put this between the clamp intrinsics.

farzonl · 2024-09-20T19:37:41Z

clang/lib/Sema/SemaHLSL.cpp

+      return true;
+    if (CheckFloatOrHalfRepresentations(&SemaRef, TheCall))
+      return true;
+


Maybe we should do a vector size == 3 check to prevent misuse of the builtin? Downsize is the check isn't triggerable from the hlsl function name.

There are also other asserts to catch when the size isn't 3, I don't think this is needed.

If thats the case could you add a test to clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl As long as this gets caugh by an error in Sema then we should be good.

float2 builtin_cross_float2(float2 p1, float2 p2) { return __builtin_hlsl_cross(p1, p2); } float4 builtin_cross_float4(float4 p1, float4 p2) { return __builtin_hlsl_cross(p1, p2); }

I added a diagnostic and put the test in cross-errors.hlsl instead.

I can't find a float4 builtin_cross_float4(float4 p1, float4 p2) test case in cross-errors.hlsl?

Do float4s implicitly truncate to float3 perhaps?

farzonl · 2024-09-20T20:03:00Z

llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp

+  Value *op1 = Orig->getOperand(1);
+  IRBuilder<> Builder(Orig);
+
+  Value *op0_x = Builder.CreateExtractElement(op0, (uint64_t)0);


NIT: in general I don't think this matters but since cross product is crossing over elements
with x1*y2 - x2*y1 I think its worth naming these elements like so Builder.CreateExtractElement(op0, 0, "x0");
This will effect the SSA names so it isn't just %1-%n

farzonl · 2024-09-23T18:42:53Z

clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl

+bool2 builtin_cross_int2_to_float2_promotion(int2 p1)
+{
+  return __builtin_hlsl_cross(p1, p1);
+  // expected-error@-1 {{passing 'int2' (aka 'vector<int, 2>') to parameter of incompatible type '__attribute__((__vector_size__(2 * sizeof(float)))) float' (vector of 2 'float' values)}}


what happens if its

float3 builtin_cross_float3_int3(float3 p1, int3 p2) { return __builtin_hlsl_cross(p1, p2); }

emits an error that all args must be the same type. Added this case to cross-errors.hlsl

ah ok it got promoted in DXC so wanted t check: https://hlsl.godbolt.org/z/3nvGve7WP

farzonl · 2024-09-23T22:17:40Z

llvm/test/CodeGen/DirectX/cross.ll

@@ -0,0 +1,57 @@
+; RUN: opt -S  -dxil-intrinsic-expansion  < %s | FileCheck %s --check-prefix=CHECK


typicall we do --check-prefix if one run is different than the other. in this case they are the same. My recommendation is to drop one of these runs and remove the check prefix.

My point still stands why do you need two runs?

llvm-beanz · 2024-09-30T17:53:32Z

clang/include/clang/Basic/DiagnosticSemaKinds.td

+def err_invalid_vector_size : Error<
+  "expected vector size of '%0', but vector size is '%1'">;


I'm a little surprised we don't have a similar diagnostic, but it seems that we don't. Maybe we could make a small tweak to an existing message and reuse the message. What if we changed err_vector_incorrect_num_initializers to:

def err_vector_incorrect_num_initializers : Error< "%select{too many|too few}0 elements in vector %select{initialization|operand}3 (expected %1 elements, have %2)">;

Then you could add a 0 argument to the one place it is called, and change your new diagnostic to:

Suggested change

def err_invalid_vector_size : Error<

"expected vector size of '%0', but vector size is '%1'">;

def err_incorrect_vector_element_count : Error<

err_vector_incorrect_num_initializers.Summary>;

llvm-beanz · 2024-09-30T23:47:47Z

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -10506,7 +10506,9 @@ def err_second_argument_to_cwsc_not_pointer : Error<
  "second argument to __builtin_call_with_static_chain must be of pointer type">;

 def err_vector_incorrect_num_initializers : Error<
-  "%select{too many|too few}0 elements in vector initialization (expected %1 elements, have %2)">;
+  "%select{too many|too few}0 elements in vector %select{initialization|operand}3 (expected %1 elements, have %2)">;
+def err_incorrect_vector_element_count  : Error<


I think you updated all the uses of this to use the other diagnostic, which is fine, but then we can remove this.

Also maybe rename err_vector_incorrect_num_initializers -> err_vector_incorrect_num_elements?

llvm-beanz · 2024-10-01T00:01:58Z

clang/include/clang/Basic/Builtins.td

+  let Spellings = ["__builtin_hlsl_create_handle"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void*(unsigned char)";
+}


This looks like an unrelated change sliding back in?

It's the result of a merge, I'll remove it.

llvm-beanz · 2024-10-01T00:02:45Z

clang/lib/Sema/SemaInit.cpp

@@ -1977,7 +1977,7 @@ void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
    if (!VerifyOnly)
      SemaRef.Diag(IList->getBeginLoc(),
                   diag::err_vector_incorrect_num_initializers)
-          << (numEltsInit < maxElements) << maxElements << numEltsInit;
+          << (numEltsInit < maxElements) << maxElements << numEltsInit << 0;


nit: please comment the meaning of the number

Suggested change

<< (numEltsInit < maxElements) << maxElements << numEltsInit << 0;

<< (numEltsInit < maxElements) << maxElements << numEltsInit << /*initialization*/ 0;

llvm-beanz · 2024-10-01T00:03:13Z

clang/lib/Sema/SemaHLSL.cpp

+
+      SemaRef.Diag(TheCall->getBeginLoc(),
+                   diag::err_vector_incorrect_num_initializers)
+          << LessOrMore << 3 << NumElementsArg2 << 1;


nit:

Suggested change

<< LessOrMore << 3 << NumElementsArg2 << 1;

<< LessOrMore << 3 << NumElementsArg2 << /*operand*/ 1;

llvm-beanz · 2024-10-01T00:03:29Z

clang/lib/Sema/SemaHLSL.cpp

+      int LessOrMore = NumElementsArg1 > 3 ? 1 : 0;
+      SemaRef.Diag(TheCall->getBeginLoc(),
+                   diag::err_vector_incorrect_num_initializers)
+          << LessOrMore << 3 << NumElementsArg1 << 1;


nit:

Suggested change

<< LessOrMore << 3 << NumElementsArg1 << 1;

<< LessOrMore << 3 << NumElementsArg1 << /*operand*/ 1;

llvm-beanz

A few last small things, but mostly looks good.

bogner · 2024-09-30T23:58:00Z

clang/include/clang/Basic/Builtins.td

+def HLSLCreateHandle : LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_create_handle"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void*(unsigned char)";
+}


This was removed recently, looks like your change is accidentally reintroducing it.

bogner · 2024-10-01T00:00:29Z

clang/lib/Sema/SemaHLSL.cpp

+      return true;
+    }
+    if (NumElementsArg2 != 3) {
+      int LessOrMore = NumElementsArg1 > 3 ? 1 : 0;


Should this be NumElementsArg2?

Good catch!

bogner · 2024-10-01T00:03:46Z

clang/test/CodeGenHLSL/builtins/cross.hlsl

+// NATIVE_HALF: define [[FNATTRS]] <3 x half> @
+// NATIVE_HALF: call <3 x half> @llvm.[[TARGET]].cross.v3f16(<3 x half>
+// NO_HALF: call <3 x float> @llvm.[[TARGET]].cross.v3f32(<3 x float>
+// NATIVE_HALF: ret <3 x half> %hlsl.cross
+// NO_HALF: ret <3 x float> %hlsl.cross


It's probably clearer to put the NATIVE_HALF checks consecutively, followed by the NO_HALF checks - the way they're intertwined here is a bit hard to read. Also, it looks like the define check is missing for the NO_HALF case.

bogner · 2024-10-01T00:05:35Z

llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp

+  auto MulSub = [&](Value *x0, Value *y0, Value *x1, Value *y1) -> Value * {
+    Value *xy = Builder.CreateFMul(x0, y1);
+    Value *yx = Builder.CreateFMul(y0, x1);
+    return Builder.CreateFSub(xy, yx);


Should we copy the value name from Orig for the final result here?

I don't think so, since we want distinct variable names when constructing the final result vector. Each insertelement needs a unique variable name so that contents of the vector are correct.

I tried it out and turns out each variable was assigned a unique variable name, contrary to what I expected. So your comment has been incorporated.

damyanp

LGTM, and I see you've addressed all of the feedback.

Would be good to check @bogner is happy with the resolution of this issue before merging.

pow2clk

Looks good to me. I just have a couple nits that you might include if you create another commit for another reason.

pow2clk · 2024-10-02T20:26:52Z

clang/test/SemaHLSL/BuiltIns/cross-errors.hlsl

@@ -0,0 +1,43 @@
+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -disable-llvm-passes -verify -verify-ignore-unexpected


Is this producing or expected to produce unexpected diagnostics? I see this flag in a few other uses of this in SemaHLSL, but not so much in other Sema* test directories. Perhaps it's getting copied over needlessly?

If there are some tricky diagnostics getting produced, it might be better to limit them by assigning tis to a specific type of diagnostic.

Thanks, this revealed a missing open curly brace on line 18!
I got rid of this extra flag, seems to be a needless copy.

pow2clk · 2024-10-02T20:29:38Z

clang/test/CodeGenHLSL/builtins/cross.hlsl

+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF \
+// RUN:   -DFNATTRS="spir_func noundef" -DTARGET=spv


It's harmless, but given that these run lines are long and hard to compare as-is, I'll note for next time that -x hlsl isn't necessary as long as the file ends in .hlsl

pow2clk · 2024-10-02T20:33:01Z

llvm/lib/Target/DirectX/DXILIntrinsicExpansion.cpp

+  Value *op1 = Orig->getOperand(1);
+  IRBuilder<> Builder(Orig);
+
+  Value *op0_x = Builder.CreateExtractElement(op0, (uint64_t)0, "x0");


Just curious why the 0 needs a cast and the others don't.

Without the cast I get:
error C2668: 'llvm::IRBuilderBase::CreateExtractElement': ambiguous call to overloaded function note: while trying to match the argument list '(llvm::Value *, int)'
as a compilation error.

Isn't C++ fun!

…end (llvm#109180) This PR adds the step intrinsic and an HLSL function that uses it. The SPIRV backend is also implemented. Used llvm#106471 as a reference. Fixes llvm#99095

add cross hlsl function

3c58861

bob80905 requested a review from farzonl September 18, 2024 21:53

farzonl reviewed Sep 20, 2024

View reviewed changes

bob80905 added 2 commits September 20, 2024 15:08

address Farzon

9109b48

use correct naming convention for vec elements

b5dc3e7

bob80905 self-assigned this Sep 23, 2024

farzonl reviewed Sep 23, 2024

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add more test cases to cross-errors

a8f8faf

farzonl reviewed Sep 23, 2024

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farzonl approved these changes Sep 23, 2024

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bob80905 added 2 commits September 23, 2024 16:10

drop unneeded check-prefix

32d6add

remove an unneeded run

c13d2b1

llvm-beanz reviewed Sep 30, 2024

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bob80905 added 2 commits September 30, 2024 12:20

Merge branch 'main' into add_hlsl_cross_function

f31ecc6

update diag message

81aa399

llvm-beanz reviewed Sep 30, 2024

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llvm-beanz reviewed Oct 1, 2024

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bogner reviewed Oct 1, 2024

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use orig name, adjust tests, address feedback

15defe2

damyanp approved these changes Oct 2, 2024

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Merge branch 'main' into add_hlsl_cross_function

8a367a5

pow2clk approved these changes Oct 2, 2024

View reviewed changes

remove unneeded flag, update code with latest main

514c40b

bogner approved these changes Oct 3, 2024

View reviewed changes

bob80905 merged commit c098435 into llvm:main Oct 3, 2024
9 checks passed

	"step operands must have a float representation");
	"cross operands must have a float representation");

		@@ -0,0 +1,57 @@
		; RUN: opt -S -dxil-intrinsic-expansion < %s \| FileCheck %s --check-prefix=CHECK

		def err_invalid_vector_size : Error<
		"expected vector size of '%0', but vector size is '%1'">;

	<< (numEltsInit < maxElements) << maxElements << numEltsInit << 0;
	<< (numEltsInit < maxElements) << maxElements << numEltsInit << /initialization/ 0;

	<< LessOrMore << 3 << NumElementsArg2 << 1;
	<< LessOrMore << 3 << NumElementsArg2 << /operand/ 1;

	<< LessOrMore << 3 << NumElementsArg1 << 1;
	<< LessOrMore << 3 << NumElementsArg1 << /operand/ 1;

		@@ -0,0 +1,43 @@
		// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -disable-llvm-passes -verify -verify-ignore-unexpected

Add cross builtins and cross HLSL function to DirectX and SPIR-V backend #109180

Add cross builtins and cross HLSL function to DirectX and SPIR-V backend #109180

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