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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-10-23 15:48:08 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-10-23 15:48:08 +0000 |
| commit | 32da2f9245f259fc437129ec9894e664b64ad0d4 (patch) | |
| tree | 6c5c61a606556bf63be0159baeb91962eb79688c /llvm/test/CodeGen/X86/avx-vbroadcast.ll | |
| parent | f9cb007355de70b6e8204156fdcfaf886dbed316 (diff) | |
| download | bcm5719-llvm-32da2f9245f259fc437129ec9894e664b64ad0d4.tar.gz bcm5719-llvm-32da2f9245f259fc437129ec9894e664b64ad0d4.zip | |
[DAGCombine] Permit combining of shuffles of equivalent splat BUILD_VECTORs
combineShuffleOfScalars is very conservative about shuffled BUILD_VECTORs that can be combined together.
This patch adds one additional case - if both BUILD_VECTORs represent splats of the same scalar value but with different UNDEF elements, then we should create a single splat BUILD_VECTOR, sharing only the UNDEF elements defined by the shuffle mask.
Differential Revision: https://reviews.llvm.org/D38696
llvm-svn: 316331
Diffstat (limited to 'llvm/test/CodeGen/X86/avx-vbroadcast.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/avx-vbroadcast.ll | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/llvm/test/CodeGen/X86/avx-vbroadcast.ll b/llvm/test/CodeGen/X86/avx-vbroadcast.ll index 65e856c03c8..5dcc5a70529 100644 --- a/llvm/test/CodeGen/X86/avx-vbroadcast.ll +++ b/llvm/test/CodeGen/X86/avx-vbroadcast.ll @@ -853,14 +853,12 @@ define <4 x double> @broadcast_shuffle1032(double* %p) { ; X32-LABEL: broadcast_shuffle1032: ; X32: ## BB#0: ; X32-NEXT: movl {{[0-9]+}}(%esp), %eax -; X32-NEXT: vmovddup {{.*#+}} xmm0 = mem[0,0] -; X32-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0 +; X32-NEXT: vbroadcastsd (%eax), %ymm0 ; X32-NEXT: retl ; ; X64-LABEL: broadcast_shuffle1032: ; X64: ## BB#0: -; X64-NEXT: vmovddup {{.*#+}} xmm0 = mem[0,0] -; X64-NEXT: vinsertf128 $1, %xmm0, %ymm0, %ymm0 +; X64-NEXT: vbroadcastsd (%rdi), %ymm0 ; X64-NEXT: retq %1 = load double, double* %p %2 = insertelement <2 x double> undef, double %1, i32 1 |
