b10ecfa914
Currently SLP vectorizer tries to keep only GEPs as scalar, if they are vectorized but used externally. Same approach can be used for all scalar values. This patch tries to keep original scalars if all its operands remain scalar or externally used, the cost of the original scalar is lower than the cost of the extractelement instruction, or if the number of externally used scalars in the same entry is power of 2. Last criterion allows better revectorization for multiply used scalars. Reviewers: RKSimon Reviewed By: RKSimon Pull Request: https://github.com/llvm/llvm-project/pull/100904
36 lines
1.4 KiB
LLVM
36 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S --passes=slp-vectorizer -slp-threshold=-99999 < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
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define void @test() {
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; CHECK-LABEL: define void @test() {
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; CHECK-NEXT: [[BB:.*]]:
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; CHECK-NEXT: [[TRUNC:%.*]] = trunc i64 0 to i32
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; CHECK-NEXT: br label %[[BB1:.*]]
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; CHECK: [[BB1]]:
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; CHECK-NEXT: [[TMP0:%.*]] = phi <2 x i32> [ zeroinitializer, %[[BB]] ], [ [[TMP4:%.*]], %[[BB1]] ]
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i32> [[TMP0]], i32 1
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; CHECK-NEXT: [[TMP2:%.*]] = call i8 @llvm.vector.reduce.mul.v4i8(<4 x i8> zeroinitializer)
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; CHECK-NEXT: [[TMP3:%.*]] = zext i8 [[TMP2]] to i32
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; CHECK-NEXT: [[OP_RDX:%.*]] = mul i32 [[TMP3]], [[TMP1]]
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; CHECK-NEXT: [[OP_RDX1:%.*]] = mul i32 [[OP_RDX]], [[TRUNC]]
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; CHECK-NEXT: [[TMP4]] = insertelement <2 x i32> <i32 0, i32 poison>, i32 [[OP_RDX1]], i32 1
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; CHECK-NEXT: br label %[[BB1]]
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;
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bb:
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br label %bb1
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bb1:
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%phi = phi i32 [ 0, %bb ], [ %mul9, %bb1 ]
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%phi2 = phi i32 [ 0, %bb ], [ 0, %bb1 ]
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%trunc = trunc i64 0 to i32
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%mul = mul i32 0, %trunc
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%mul3 = mul i32 %trunc, %phi
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%mul4 = mul i32 %mul3, %mul
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%mul5 = mul i32 %mul4, %mul
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%trunc6 = trunc i64 0 to i32
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%mul7 = mul i32 0, %trunc6
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%mul8 = mul i32 %mul5, %mul7
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%mul9 = mul i32 %mul8, %mul7
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br label %bb1
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}
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