[SPIRV] Make access qualifier optional for spirv.Image type (llvm#110852

)

The SPIRV backend has a special type named `spirv.Image`. This type is
meant to correspond to the OpTypeImage instruction in SPIR-V, but there
is one difference. The access qualifier operand in OpTypeImage is
optional. On top of that, the access qualifiers are only valid for
kernels, and not for shaders.

We want to reuse this type when generating shader from HLSL, but we
can't use the access qualifier. This commit make the access qualifer
optional in the target extension type.

The same is done for `spirv.SampledImage`.

Contributes to llvm#81036

llvm/docs/SPIRVUsage.rst

@@ -223,19 +223,19 @@ using target extension types and are represented as follows:
 
   .. table:: SPIR-V Opaque Types
 
-     ================== ====================== =========================================================================================
+     ================== ====================== ===========================================================================================
      SPIR-V Type        LLVM type name         LLVM type arguments
-     ================== ====================== =========================================================================================
-     OpTypeImage        ``spirv.Image``        sampled type, dimensionality, depth, arrayed, MS, sampled, image format, access qualifier
+     ================== ====================== ===========================================================================================
+     OpTypeImage        ``spirv.Image``        sampled type, dimensionality, depth, arrayed, MS, sampled, image format, [access qualifier]
      OpTypeSampler      ``spirv.Sampler``      (none)
-     OpTypeSampledImage ``spirv.SampledImage`` sampled type, dimensionality, depth, arrayed, MS, sampled, image format, access qualifier
+     OpTypeSampledImage ``spirv.SampledImage`` sampled type, dimensionality, depth, arrayed, MS, sampled, image format, [access qualifier]
      OpTypeEvent        ``spirv.Event``        (none)
      OpTypeDeviceEvent  ``spirv.DeviceEvent``  (none)
      OpTypeReserveId    ``spirv.ReserveId``    (none)
      OpTypeQueue        ``spirv.Queue``        (none)
      OpTypePipe         ``spirv.Pipe``         access qualifier
      OpTypePipeStorage  ``spirv.PipeStorage``  (none)
-     ================== ====================== =========================================================================================
+     ================== ====================== ===========================================================================================
 
 All integer arguments take the same value as they do in their `corresponding
 SPIR-V instruction <https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#_type_declaration_instructions>`_.

llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp

@@ -2678,19 +2678,27 @@ getImageType(const TargetExtType *ExtensionType,
          "SPIR-V image builtin type must have sampled type parameter!");
   const SPIRVType *SampledType =
       GR->getOrCreateSPIRVType(ExtensionType->getTypeParameter(0), MIRBuilder);
-  assert(ExtensionType->getNumIntParameters() == 7 &&
+  assert((ExtensionType->getNumIntParameters() == 7 ||
+          ExtensionType->getNumIntParameters() == 6) &&
          "Invalid number of parameters for SPIR-V image builtin!");
+
+  SPIRV::AccessQualifier::AccessQualifier accessQualifier =
+      SPIRV::AccessQualifier::None;
+  if (ExtensionType->getNumIntParameters() == 7) {
+    accessQualifier = Qualifier == SPIRV::AccessQualifier::WriteOnly
+                          ? SPIRV::AccessQualifier::WriteOnly
+                          : SPIRV::AccessQualifier::AccessQualifier(
+                                ExtensionType->getIntParameter(6));
+  }
+
   // Create or get an existing type from GlobalRegistry.
   return GR->getOrCreateOpTypeImage(
       MIRBuilder, SampledType,
       SPIRV::Dim::Dim(ExtensionType->getIntParameter(0)),
       ExtensionType->getIntParameter(1), ExtensionType->getIntParameter(2),
       ExtensionType->getIntParameter(3), ExtensionType->getIntParameter(4),
       SPIRV::ImageFormat::ImageFormat(ExtensionType->getIntParameter(5)),
-      Qualifier == SPIRV::AccessQualifier::WriteOnly
-          ? SPIRV::AccessQualifier::WriteOnly
-          : SPIRV::AccessQualifier::AccessQualifier(
-                ExtensionType->getIntParameter(6)));
+      accessQualifier);
 }
 
 static SPIRVType *getSampledImageType(const TargetExtType *OpaqueType,

llvm/lib/Target/SPIRV/SPIRVDuplicatesTracker.h

@@ -103,13 +103,15 @@ make_descr_image(const Type *SampledTy, unsigned Dim, unsigned Depth,
 inline SpecialTypeDescriptor
 make_descr_sampled_image(const Type *SampledTy, const MachineInstr *ImageTy) {
   assert(ImageTy->getOpcode() == SPIRV::OpTypeImage);
+  unsigned AC = AccessQualifier::AccessQualifier::None;
+  if (ImageTy->getNumOperands() > 8)
+    AC = ImageTy->getOperand(8).getImm();
   return std::make_tuple(
       SampledTy,
       ImageAttrs(
           ImageTy->getOperand(2).getImm(), ImageTy->getOperand(3).getImm(),
           ImageTy->getOperand(4).getImm(), ImageTy->getOperand(5).getImm(),
-          ImageTy->getOperand(6).getImm(), ImageTy->getOperand(7).getImm(),
-          ImageTy->getOperand(8).getImm())
+          ImageTy->getOperand(6).getImm(), ImageTy->getOperand(7).getImm(), AC)
           .Val,
       SpecialTypeKind::STK_SampledImage);
 }

llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp

@@ -1149,16 +1149,19 @@ SPIRVType *SPIRVGlobalRegistry::getOrCreateOpTypeImage(
     return Res;
   Register ResVReg = createTypeVReg(MIRBuilder);
   DT.add(TD, &MIRBuilder.getMF(), ResVReg);
-  return MIRBuilder.buildInstr(SPIRV::OpTypeImage)
-      .addDef(ResVReg)
-      .addUse(getSPIRVTypeID(SampledType))
-      .addImm(Dim)
-      .addImm(Depth)        // Depth (whether or not it is a Depth image).
-      .addImm(Arrayed)      // Arrayed.
-      .addImm(Multisampled) // Multisampled (0 = only single-sample).
-      .addImm(Sampled)      // Sampled (0 = usage known at runtime).
-      .addImm(ImageFormat)
-      .addImm(AccessQual);
+  auto MIB = MIRBuilder.buildInstr(SPIRV::OpTypeImage)
+                 .addDef(ResVReg)
+                 .addUse(getSPIRVTypeID(SampledType))
+                 .addImm(Dim)
+                 .addImm(Depth)   // Depth (whether or not it is a Depth image).
+                 .addImm(Arrayed) // Arrayed.
+                 .addImm(Multisampled) // Multisampled (0 = only single-sample).
+                 .addImm(Sampled)      // Sampled (0 = usage known at runtime).
+                 .addImm(ImageFormat);
+
+  if (AccessQual != SPIRV::AccessQualifier::None)
+    MIB.addImm(AccessQual);
+  return MIB;
 }
 
 SPIRVType *

llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp

@@ -691,7 +691,9 @@ void RequirementHandler::initAvailableCapabilitiesForVulkan(
 
   // Provided by all supported Vulkan versions.
   addAvailableCaps({Capability::Int16, Capability::Int64, Capability::Float16,
-                    Capability::Float64, Capability::GroupNonUniform});
+                    Capability::Float64, Capability::GroupNonUniform,
+                    Capability::Image1D, Capability::SampledBuffer,
+                    Capability::ImageBuffer});
 }
 
 } // namespace SPIRV
@@ -776,12 +778,13 @@ static void addOpTypeImageReqs(const MachineInstr &MI,
   }
 
   // Has optional access qualifier.
-  // TODO: check if it's OpenCL's kernel.
-  if (MI.getNumOperands() > 8 &&
-      MI.getOperand(8).getImm() == SPIRV::AccessQualifier::ReadWrite)
-    Reqs.addRequirements(SPIRV::Capability::ImageReadWrite);
-  else
-    Reqs.addRequirements(SPIRV::Capability::ImageBasic);
+  if (ST.isOpenCLEnv()) {
+    if (MI.getNumOperands() > 8 &&
+        MI.getOperand(8).getImm() == SPIRV::AccessQualifier::ReadWrite)
+      Reqs.addRequirements(SPIRV::Capability::ImageReadWrite);
+    else
+      Reqs.addRequirements(SPIRV::Capability::ImageBasic);
+  }
 }
 
 // Add requirements for handling atomic float instructions

llvm/lib/Target/SPIRV/SPIRVSymbolicOperands.td

@@ -1096,6 +1096,7 @@ multiclass AccessQualifierOperand<bits<32> value, list<Capability> reqCapabiliti
 defm ReadOnly : AccessQualifierOperand<0, [Kernel]>;
 defm WriteOnly : AccessQualifierOperand<1, [Kernel]>;
 defm ReadWrite : AccessQualifierOperand<2, [Kernel]>;
+defm None : AccessQualifierOperand<3, []>;
 
 //===----------------------------------------------------------------------===//
 // Multiclass used to define FunctionParameterAttribute enum values and at the

llvm/test/CodeGen/SPIRV/ShaderBufferImage.ll

@@ -0,0 +1,20 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv-vulkan-library %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-vulkan-library %s -o - -filetype=obj | spirv-val %}
+
+; CHECK-NOT: OpCapability ImageBasic
+; CHECK-NOT: OpCapability ImageReadWrite
+; CHECK: OpCapability ImageBuffer
+; CHECK-NOT: OpCapability ImageBasic
+; CHECK-NOT: OpCapability ImageReadWrite
+
+; CHECK-DAG: [[Float:%[0-9]+]] = OpTypeFloat 32
+; CHECK-DAG: [[Void:%[0-9]+]] = OpTypeVoid
+; CHECK-DAG: [[ImageType:%[0-9]+]] = OpTypeImage [[Float]] Buffer 2 0 0 2 R32i {{$}}
+; CHECK-DAG: [[ImageFuncType:%[0-9]+]] = OpTypeFunction [[Void]] [[ImageType]]
+
+; CHECK: {{%[0-9]+}} = OpFunction [[Void]] DontInline [[ImageFuncType]]
+define void @ImageWithNoAccessQualifier(target("spirv.Image", float, 5, 2, 0, 0, 2, 24) %img) #0 {
+  ret void
+}
+
+attributes #0 = { convergent noinline norecurse "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }

llvm/test/CodeGen/SPIRV/ShaderImage.ll

@@ -0,0 +1,21 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv-vulkan-library %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-vulkan-library %s -o - -filetype=obj | spirv-val %}
+
+; CHECK-DAG: [[Float:%[0-9]+]] = OpTypeFloat 32
+; CHECK-DAG: [[Void:%[0-9]+]] = OpTypeVoid
+; CHECK-DAG: [[ImageType:%[0-9]+]] = OpTypeImage [[Float]] Buffer 2 0 0 1 R32i {{$}}
+; CHECK-DAG: [[ImageFuncType:%[0-9]+]] = OpTypeFunction [[Void]] [[ImageType]]
+; CHECK-DAG: [[SampledImageType:%[0-9]+]] = OpTypeSampledImage [[ImageType]]
+; CHECK-DAG: [[SampledImageFuncType:%[0-9]+]] = OpTypeFunction [[Void]] [[SampledImageType]]
+
+; CHECK: {{%[0-9]+}} = OpFunction [[Void]] DontInline [[ImageFuncType]]
+define void @ImageWithNoAccessQualifier(target("spirv.Image", float, 5, 2, 0, 0, 1, 24) %img) #0 {
+  ret void
+}
+
+; CHECK: {{%[0-9]+}} = OpFunction [[Void]] DontInline [[SampledImageFuncType]]
+define void @SampledImageWithNoAccessQualifier(target("spirv.SampledImage", float, 5, 2, 0, 0, 1, 24) %img) #0 {
+  ret void
+}
+
+attributes #0 = { convergent noinline norecurse "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }