[SLP]Fix PR107036: Check if the type of the user is sizable before re…

…questing its size.

Only some instructions should be considered as potentially reducing the
size of the operands types, not all instructions should be considered.

Fixes #107036

(cherry picked from commit f381cd0)

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -15539,6 +15539,11 @@ void BoUpSLP::computeMinimumValueSizes() {
                     const TreeEntry *UserTE = E.UserTreeIndices.back().UserTE;
                     if (TE == UserTE || !TE)
                       return false;
+                    if (!isa<CastInst, BinaryOperator, FreezeInst, PHINode,
+                             SelectInst>(U) ||
+                        !isa<CastInst, BinaryOperator, FreezeInst, PHINode,
+                             SelectInst>(UserTE->getMainOp()))
+                      return true;
                     unsigned UserTESz = DL->getTypeSizeInBits(
                         UserTE->Scalars.front()->getType());
                     auto It = MinBWs.find(TE);

llvm/test/Transforms/SLPVectorizer/X86/minbw-user-non-sizable.ll

@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S --passes=slp-vectorizer -mtriple=x86_64-unknown-linux-gnu < %s -slp-threshold=-100 | FileCheck %s
+
+define void @test(ptr %i) {
+; CHECK-LABEL: define void @test(
+; CHECK-SAME: ptr [[I:%.*]]) {
+; CHECK-NEXT:  [[BB:.*]]:
+; CHECK-NEXT:    br label %[[BB2:.*]]
+; CHECK:       [[BB2]]:
+; CHECK-NEXT:    [[TMP0:%.*]] = phi <2 x i32> [ [[TMP3:%.*]], %[[BB2]] ], [ zeroinitializer, %[[BB]] ]
+; CHECK-NEXT:    store <2 x i32> [[TMP0]], ptr [[I]], align 4
+; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <2 x i32> [[TMP0]], <2 x i32> <i32 0, i32 poison>, <2 x i32> <i32 2, i32 1>
+; CHECK-NEXT:    [[TMP2:%.*]] = trunc <2 x i32> [[TMP1]] to <2 x i1>
+; CHECK-NEXT:    [[TMP3]] = select <2 x i1> [[TMP2]], <2 x i32> zeroinitializer, <2 x i32> zeroinitializer
+; CHECK-NEXT:    br label %[[BB2]]
+;
+bb:
+  %i1 = getelementptr i8, ptr %i, i64 4
+  br label %bb2
+
+bb2:
+  %i3 = phi i32 [ %i6, %bb2 ], [ 0, %bb ]
+  %i4 = phi i32 [ %i8, %bb2 ], [ 0, %bb ]
+  store i32 %i3, ptr %i
+  store i32 %i4, ptr %i1
+  %i5 = trunc i32 0 to i1
+  %i6 = select i1 %i5, i32 0, i32 0
+  %i7 = trunc i32 %i4 to i1
+  %i8 = select i1 %i7, i32 0, i32 0
+  br label %bb2
+}