[llvm] [VectorCombine] Refactor Insertion Point setting in shrinkType (PR #108398)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Igor Kirillov (igogo-x86)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/108398.diff


2 Files Affected:

- (modified) llvm/lib/Transforms/Vectorize/VectorCombine.cpp (+1-7) 
- (modified) llvm/test/Transforms/VectorCombine/AArch64/shrink-types.ll (+8-8) 


``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
index e993e5684f4115..d7afe2f426d392 100644
--- a/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
+++ b/llvm/lib/Transforms/Vectorize/VectorCombine.cpp
@@ -2651,15 +2651,9 @@ bool VectorCombine::shrinkType(llvm::Instruction &I) {
   if (ShrinkCost > CurrentCost)
     return false;
 
+  Builder.SetInsertPoint(&I);
   Value *Op0 = ZExted;
-  if (auto *OI = dyn_cast<Instruction>(OtherOperand)) {
-    if (isa<PHINode>(OI))
-      Builder.SetInsertPoint(OI->getParent()->getFirstInsertionPt());
-    else
-      Builder.SetInsertPoint(OI->getNextNode());
-  }
   Value *Op1 = Builder.CreateTrunc(OtherOperand, SmallTy);
-  Builder.SetInsertPoint(&I);
   // Keep the order of operands the same
   if (I.getOperand(0) == OtherOperand)
     std::swap(Op0, Op1);
diff --git a/llvm/test/Transforms/VectorCombine/AArch64/shrink-types.ll b/llvm/test/Transforms/VectorCombine/AArch64/shrink-types.ll
index 33e295841f641a..1a23f0a0ac142f 100644
--- a/llvm/test/Transforms/VectorCombine/AArch64/shrink-types.ll
+++ b/llvm/test/Transforms/VectorCombine/AArch64/shrink-types.ll
@@ -45,17 +45,17 @@ define i32 @multiuse(<16 x i32> %u, <16 x i32> %v, ptr %b) {
 ; CHECK-LABEL: @multiuse(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[U_MASKED:%.*]] = and <16 x i32> [[U:%.*]], <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
-; CHECK-NEXT:    [[TMP0:%.*]] = trunc <16 x i32> [[U_MASKED]] to <16 x i8>
 ; CHECK-NEXT:    [[V_MASKED:%.*]] = and <16 x i32> [[V:%.*]], <i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255, i32 255>
-; CHECK-NEXT:    [[TMP1:%.*]] = trunc <16 x i32> [[V_MASKED]] to <16 x i8>
 ; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[B:%.*]], align 1
-; CHECK-NEXT:    [[TMP2:%.*]] = lshr <16 x i8> [[WIDE_LOAD]], <i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4>
-; CHECK-NEXT:    [[TMP3:%.*]] = or <16 x i8> [[TMP2]], [[TMP1]]
-; CHECK-NEXT:    [[TMP4:%.*]] = zext <16 x i8> [[TMP3]] to <16 x i32>
-; CHECK-NEXT:    [[TMP5:%.*]] = and <16 x i8> [[WIDE_LOAD]], <i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15>
-; CHECK-NEXT:    [[TMP6:%.*]] = or <16 x i8> [[TMP5]], [[TMP0]]
+; CHECK-NEXT:    [[TMP0:%.*]] = lshr <16 x i8> [[WIDE_LOAD]], <i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4, i8 4>
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc <16 x i32> [[V_MASKED]] to <16 x i8>
+; CHECK-NEXT:    [[TMP2:%.*]] = or <16 x i8> [[TMP0]], [[TMP1]]
+; CHECK-NEXT:    [[TMP3:%.*]] = zext <16 x i8> [[TMP2]] to <16 x i32>
+; CHECK-NEXT:    [[TMP4:%.*]] = and <16 x i8> [[WIDE_LOAD]], <i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15, i8 15>
+; CHECK-NEXT:    [[TMP5:%.*]] = trunc <16 x i32> [[U_MASKED]] to <16 x i8>
+; CHECK-NEXT:    [[TMP6:%.*]] = or <16 x i8> [[TMP4]], [[TMP5]]
 ; CHECK-NEXT:    [[TMP7:%.*]] = zext <16 x i8> [[TMP6]] to <16 x i32>
-; CHECK-NEXT:    [[TMP8:%.*]] = add nuw nsw <16 x i32> [[TMP4]], [[TMP7]]
+; CHECK-NEXT:    [[TMP8:%.*]] = add nuw nsw <16 x i32> [[TMP3]], [[TMP7]]
 ; CHECK-NEXT:    [[TMP9:%.*]] = call i32 @llvm.vector.reduce.add.v16i32(<16 x i32> [[TMP8]])
 ; CHECK-NEXT:    ret i32 [[TMP9]]
 ;

``````````

</details>


https://github.com/llvm/llvm-project/pull/108398