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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-02-14 11:20:11 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2017-02-14 11:20:11 +0000 |
| commit | 75dda50ebe5771b7129db2080e35c1d51d4f5e68 (patch) | |
| tree | afd770c834128ca5e85112ccad7c14749ab16b4d /llvm/test | |
| parent | 258ff25bbce734e8826a7d2275392a46bc7e3bcd (diff) | |
| download | bcm5719-llvm-75dda50ebe5771b7129db2080e35c1d51d4f5e68.tar.gz bcm5719-llvm-75dda50ebe5771b7129db2080e35c1d51d4f5e68.zip | |
[X86][SSE] Test case showing missed PSHUFB target shuffle constant fold opportunity.
It also shows an unnecessary pshufb/broadcast being used - the original pshufb mask only requested the lowest byte.
llvm-svn: 295046
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/X86/vector-shuffle-combining-ssse3.ll | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/vector-shuffle-combining-ssse3.ll b/llvm/test/CodeGen/X86/vector-shuffle-combining-ssse3.ll index 792496e83f0..7b73bda48ce 100644 --- a/llvm/test/CodeGen/X86/vector-shuffle-combining-ssse3.ll +++ b/llvm/test/CodeGen/X86/vector-shuffle-combining-ssse3.ll @@ -586,3 +586,38 @@ define <16 x i8> @constant_fold_pshufb() { %1 = tail call <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8> <i8 15, i8 14, i8 13, i8 12, i8 11, i8 10, i8 9, i8 8, i8 7, i8 6, i8 5, i8 4, i8 3, i8 2, i8 1, i8 0>, <16 x i8> <i8 1, i8 -1, i8 -1, i8 -1, i8 undef, i8 undef, i8 -1, i8 -1, i8 15, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 7, i8 6>) ret <16 x i8> %1 } + +; FIXME - unnecessary pshufb/broadcast being used - pshufb mask only needs lowest byte. +define <16 x i8> @constant_fold_pshufb_2() { +; SSE-LABEL: constant_fold_pshufb_2: +; SSE: # BB#0: +; SSE-NEXT: movl $2, %eax +; SSE-NEXT: movd %eax, %xmm0 +; SSE-NEXT: pxor %xmm1, %xmm1 +; SSE-NEXT: pshufb %xmm1, %xmm0 +; SSE-NEXT: retq +; +; AVX1-LABEL: constant_fold_pshufb_2: +; AVX1: # BB#0: +; AVX1-NEXT: movl $2, %eax +; AVX1-NEXT: vmovd %eax, %xmm0 +; AVX1-NEXT: vpxor %xmm1, %xmm1, %xmm1 +; AVX1-NEXT: vpshufb %xmm1, %xmm0, %xmm0 +; AVX1-NEXT: retq +; +; AVX2-LABEL: constant_fold_pshufb_2: +; AVX2: # BB#0: +; AVX2-NEXT: movl $2, %eax +; AVX2-NEXT: vmovd %eax, %xmm0 +; AVX2-NEXT: vpbroadcastb %xmm0, %xmm0 +; AVX2-NEXT: retq +; +; AVX512F-LABEL: constant_fold_pshufb_2: +; AVX512F: # BB#0: +; AVX512F-NEXT: movl $2, %eax +; AVX512F-NEXT: vmovd %eax, %xmm0 +; AVX512F-NEXT: vpbroadcastb %xmm0, %xmm0 +; AVX512F-NEXT: retq + %1 = tail call <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8> <i8 2, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0, i8 0>, <16 x i8> <i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef>) + ret <16 x i8> %1 +} |
