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94c7d4af34
This patch prevents the following combine when the input vector is used more than once. insert_vector_elt (build_vector elt0, ..., eltN), NewEltIdx, idx => build_vector elt0, ..., NewEltIdx, ..., eltN The reasons are: - Building a vector may be expensive, so try to reuse the existing part of a vector instead of creating a new one (think big vectors). - elt0 to eltN now have two users instead of one. This may prevent some other optimizations. llvm-svn: 187396
68 lines
2.0 KiB
LLVM
68 lines
2.0 KiB
LLVM
; RUN: llc < %s -march=x86 -mattr=+sse2 | FileCheck %s
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; test vector shifts converted to proper SSE2 vector shifts when the shift
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; amounts are the same.
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; Note that x86 does have ashr
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; shift1a can't use a packed shift
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define void @shift1a(<2 x i64> %val, <2 x i64>* %dst) nounwind {
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entry:
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; CHECK-LABEL: shift1a:
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; CHECK: sarl
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%ashr = ashr <2 x i64> %val, < i64 32, i64 32 >
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store <2 x i64> %ashr, <2 x i64>* %dst
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ret void
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}
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define void @shift2a(<4 x i32> %val, <4 x i32>* %dst) nounwind {
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entry:
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; CHECK-LABEL: shift2a:
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; CHECK: psrad $5
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%ashr = ashr <4 x i32> %val, < i32 5, i32 5, i32 5, i32 5 >
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store <4 x i32> %ashr, <4 x i32>* %dst
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ret void
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}
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define void @shift2b(<4 x i32> %val, <4 x i32>* %dst, i32 %amt) nounwind {
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entry:
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; CHECK-LABEL: shift2b:
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; CHECK: movd
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; CHECK: psrad
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%0 = insertelement <4 x i32> undef, i32 %amt, i32 0
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%1 = insertelement <4 x i32> %0, i32 %amt, i32 1
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%2 = insertelement <4 x i32> %1, i32 %amt, i32 2
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%3 = insertelement <4 x i32> %2, i32 %amt, i32 3
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%ashr = ashr <4 x i32> %val, %3
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store <4 x i32> %ashr, <4 x i32>* %dst
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ret void
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}
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define void @shift3a(<8 x i16> %val, <8 x i16>* %dst) nounwind {
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entry:
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; CHECK-LABEL: shift3a:
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; CHECK: psraw $5
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%ashr = ashr <8 x i16> %val, < i16 5, i16 5, i16 5, i16 5, i16 5, i16 5, i16 5, i16 5 >
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store <8 x i16> %ashr, <8 x i16>* %dst
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ret void
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}
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define void @shift3b(<8 x i16> %val, <8 x i16>* %dst, i16 %amt) nounwind {
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entry:
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; CHECK-LABEL: shift3b:
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; CHECK: movzwl
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; CHECK: movd
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; CHECK: psraw
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%0 = insertelement <8 x i16> undef, i16 %amt, i32 0
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%1 = insertelement <8 x i16> %0, i16 %amt, i32 1
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%2 = insertelement <8 x i16> %1, i16 %amt, i32 2
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%3 = insertelement <8 x i16> %2, i16 %amt, i32 3
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%4 = insertelement <8 x i16> %3, i16 %amt, i32 4
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%5 = insertelement <8 x i16> %4, i16 %amt, i32 5
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%6 = insertelement <8 x i16> %5, i16 %amt, i32 6
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%7 = insertelement <8 x i16> %6, i16 %amt, i32 7
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%ashr = ashr <8 x i16> %val, %7
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store <8 x i16> %ashr, <8 x i16>* %dst
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ret void
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}
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