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Fix a bug in isVectorReductionOp() in SelectionDAGBuilder.cpp that may cause assertion failure on AArch64. 

llvm-svn: 262091
This commit is contained in:
Cong Hou 2016-02-26 23:25:30 +00:00
parent cc2e27f098
commit e0eb8bfe37
2 changed files with 56 additions and 4 deletions
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8
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -2393,8 +2393,9 @@ static bool isVectorReductionOp(const User *I) {
// ElemNumToReduce / 2 elements in another vector.
unsigned ResultElements = ShufInst->getType()->getVectorNumElements();
ElemNumToReduce = ResultElements <= ElemNumToReduce ? ResultElements
: ElemNumToReduce;
if (ResultElements < ElemNum)
return false;
if (ElemNumToReduce == 1)
return false;
if (!isa<UndefValue>(U->getOperand(1)))
@ -2407,8 +2408,7 @@ static bool isVectorReductionOp(const User *I) {
return false;
// There is only one user of this ShuffleVector instruction, which
// must
// be a reduction operation.
// must be a reduction operation.
if (!U->hasOneUse())
return false;

52
llvm/test/CodeGen/AArch64/arm64-detect-vec-redux.ll Normal file
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@ -0,0 +1,52 @@
; RUN: llc -mtriple=arm64-darwin-unknown < %s
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
; Function Attrs: nounwind readnone
define i32 @dotests_56() #0 {
entry:
%vqshrn_n4 = tail call <2 x i32> @llvm.aarch64.neon.uqshrn.v2i32(<2 x i64> zeroinitializer, i32 19)
%shuffle.i109 = shufflevector <2 x i32> %vqshrn_n4, <2 x i32> undef, <4 x i32> <i32 undef, i32 1, i32 undef, i32 undef>
%neg = xor <4 x i32> %shuffle.i109, <i32 undef, i32 -1, i32 undef, i32 undef>
%shuffle = shufflevector <4 x i32> %neg, <4 x i32> undef, <2 x i32> <i32 1, i32 undef>
%mul = mul <2 x i32> %shuffle, <i32 add (i32 extractelement (<2 x i32> bitcast (<1 x i64> <i64 -4264345899313889281> to <2 x i32>), i32 0), i32 sub (i32 0, i32 extractelement (<2 x i32> bitcast (<1 x i64> <i64 -9223231295071453185> to <2 x i32>), i32 0))), i32 undef>
%shuffle27 = shufflevector <2 x i32> %mul, <2 x i32> undef, <4 x i32> zeroinitializer
%0 = bitcast <4 x i32> %shuffle27 to <8 x i16>
%shuffle.i108 = shufflevector <8 x i16> %0, <8 x i16> undef, <8 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4>
%vqshrn_n38 = tail call <8 x i8> @llvm.aarch64.neon.uqshrn.v8i8(<8 x i16> %shuffle.i108, i32 1)
%shuffle.i = shufflevector <8 x i8> %vqshrn_n38, <8 x i8> undef, <16 x i32> <i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
%1 = bitcast <16 x i8> %shuffle.i to <2 x i64>
%vpaddq_v2.i = tail call <2 x i64> @llvm.aarch64.neon.addp.v2i64(<2 x i64> undef, <2 x i64> %1) #2
%vqdmlal2.i = tail call <2 x i64> @llvm.aarch64.neon.sqdmull.v2i64(<2 x i32> undef, <2 x i32> undef) #2
%vqdmlal_v3.i = tail call <2 x i64> @llvm.aarch64.neon.sqadd.v2i64(<2 x i64> %vpaddq_v2.i, <2 x i64> %vqdmlal2.i) #2
%vmovn.i = trunc <2 x i64> %vqdmlal_v3.i to <2 x i32>
%vqdmulh_v2.i = tail call <2 x i32> @llvm.aarch64.neon.sqdmulh.v2i32(<2 x i32> %vmovn.i, <2 x i32> zeroinitializer) #2
%2 = bitcast <2 x i32> %vqdmulh_v2.i to <1 x i64>
%vget_lane = extractelement <1 x i64> %2, i32 0
%cmp = icmp ne i64 %vget_lane, -7395147708962464393
%conv = zext i1 %cmp to i32
ret i32 %conv
}
; Function Attrs: nounwind readnone
declare <2 x i32> @llvm.aarch64.neon.uqshrn.v2i32(<2 x i64>, i32) #1
; Function Attrs: nounwind readnone
declare <8 x i8> @llvm.aarch64.neon.uqshrn.v8i8(<8 x i16>, i32) #1
; Function Attrs: nounwind readnone
declare <2 x i64> @llvm.aarch64.neon.sqdmull.v2i64(<2 x i32>, <2 x i32>) #1
; Function Attrs: nounwind readnone
declare <2 x i64> @llvm.aarch64.neon.sqadd.v2i64(<2 x i64>, <2 x i64>) #1
; Function Attrs: nounwind readnone
declare <2 x i64> @llvm.aarch64.neon.addp.v2i64(<2 x i64>, <2 x i64>) #1
; Function Attrs: nounwind readnone
declare <2 x i32> @llvm.aarch64.neon.sqdmulh.v2i32(<2 x i32>, <2 x i32>) #1
attributes #0 = { nounwind readnone "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="generic" "target-features"="+neon" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }