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Flip on vectorization of bswap intrinsics.

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The cost model conservatively assumes that it will always get scalarized and
that's about as good as we can get with the generic TTI; reasoning whether a
shuffle with an efficient lowering is available is hard. We can override that
conservative estimate for some targets in the future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209125 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2014-05-19 13:48:08 +00:00
parent bb81d9d5fa
commit 29e068bac0
2 changed files with 45 additions and 0 deletions
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1
include/llvm/Transforms/Utils/VectorUtils.h
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@ -43,6 +43,7 @@ static inline bool isTriviallyVectorizable(Intrinsic::ID ID) {
case Intrinsic::rint:
case Intrinsic::nearbyint:
case Intrinsic::round:
case Intrinsic::bswap:
case Intrinsic::ctpop:
case Intrinsic::pow:
case Intrinsic::fma:

44
test/Transforms/SLPVectorizer/X86/intrinsic.ll
View File

@ -71,5 +71,49 @@ entry:
ret void
}
declare i32 @llvm.bswap.i32(i32) nounwind readnone
define void @vec_bswap_i32(i32* %a, i32* %b, i32* %c) {
entry:
%i0 = load i32* %a, align 4
%i1 = load i32* %b, align 4
%add1 = add i32 %i0, %i1
%call1 = tail call i32 @llvm.bswap.i32(i32 %add1) nounwind readnone
%arrayidx2 = getelementptr inbounds i32* %a, i32 1
%i2 = load i32* %arrayidx2, align 4
%arrayidx3 = getelementptr inbounds i32* %b, i32 1
%i3 = load i32* %arrayidx3, align 4
%add2 = add i32 %i2, %i3
%call2 = tail call i32 @llvm.bswap.i32(i32 %add2) nounwind readnone
%arrayidx4 = getelementptr inbounds i32* %a, i32 2
%i4 = load i32* %arrayidx4, align 4
%arrayidx5 = getelementptr inbounds i32* %b, i32 2
%i5 = load i32* %arrayidx5, align 4
%add3 = add i32 %i4, %i5
%call3 = tail call i32 @llvm.bswap.i32(i32 %add3) nounwind readnone
%arrayidx6 = getelementptr inbounds i32* %a, i32 3
%i6 = load i32* %arrayidx6, align 4
%arrayidx7 = getelementptr inbounds i32* %b, i32 3
%i7 = load i32* %arrayidx7, align 4
%add4 = add i32 %i6, %i7
%call4 = tail call i32 @llvm.bswap.i32(i32 %add4) nounwind readnone
store i32 %call1, i32* %c, align 4
%arrayidx8 = getelementptr inbounds i32* %c, i32 1
store i32 %call2, i32* %arrayidx8, align 4
%arrayidx9 = getelementptr inbounds i32* %c, i32 2
store i32 %call3, i32* %arrayidx9, align 4
%arrayidx10 = getelementptr inbounds i32* %c, i32 3
store i32 %call4, i32* %arrayidx10, align 4
ret void
; CHECK-LABEL: @vec_bswap_i32(
; CHECK: load <4 x i32>
; CHECK: load <4 x i32>
; CHECK: call <4 x i32> @llvm.bswap.v4i32
; CHECK: store <4 x i32>
; CHECK: ret
}