15915c06d5
If MaxVFOnly for buildvector/buildvalue vectorization is set to true and the total number of elements to vectorize is <= 2, better to try to vectorize reductions at first, which may produce larger tree (reductions have a limit of at least 4 elements to vectorize). Smaller buildvector/buildvalue sequence will be attempted to vectorize later, with MaxVFOnly set to false. Reviewers: RKSimon Reviewed By: RKSimon Pull Request: https://github.com/llvm/llvm-project/pull/98957
29 lines
1.2 KiB
LLVM
29 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=slp-vectorizer -S -o - -mtriple=x86_64-unknown-linux -mcpu=bdver2 -pass-remarks-output=%t | FileCheck %s
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; RUN: FileCheck --input-file=%t --check-prefix=YAML %s
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; YAML: --- !Missed
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; YAML-NEXT: Pass: slp-vectorizer
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; YAML-NEXT: Name: NotPossible
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; YAML-NEXT: Function: g
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; YAML-NEXT: Args:
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; YAML-NEXT: - String: 'Cannot SLP vectorize list: only 2 elements of buildvector, trying reduction first.'
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define <2 x i32> @g(<2 x i32> %x, i32 %a, i32 %b) {
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; CHECK-LABEL: @g(
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; CHECK-NEXT: [[X1:%.*]] = extractelement <2 x i32> [[X:%.*]], i32 1
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; CHECK-NEXT: [[X1X1:%.*]] = mul i32 [[X1]], [[X1]]
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; CHECK-NEXT: [[AB:%.*]] = mul i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[INS1:%.*]] = insertelement <2 x i32> poison, i32 [[X1X1]], i32 0
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; CHECK-NEXT: [[INS2:%.*]] = insertelement <2 x i32> [[INS1]], i32 [[AB]], i32 1
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; CHECK-NEXT: ret <2 x i32> [[INS2]]
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;
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%x1 = extractelement <2 x i32> %x, i32 1
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%x1x1 = mul i32 %x1, %x1
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%ab = mul i32 %a, %b
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%ins1 = insertelement <2 x i32> poison, i32 %x1x1, i32 0
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%ins2 = insertelement <2 x i32> %ins1, i32 %ab, i32 1
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ret <2 x i32> %ins2
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}
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