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[InstCombine][AVX2] Tests showing missed opportunities to pass demanded elts through a vpermd/vpermps shuffle 

llvm-svn: 292368
This commit is contained in:
Simon Pilgrim 2017-01-18 14:23:06 +00:00
parent 517b61cb69
commit 970d67c653
1 changed files with 27 additions and 0 deletions
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27
llvm/test/Transforms/InstCombine/x86-avx2.ll
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@ -81,5 +81,32 @@ define <8 x float> @undef_test_vpermps(<8 x float> %a0) {
ret <8 x float> %a
}
; Verify simplify demanded elts.
define <8 x i32> @elts_test_vpermd(<8 x i32> %a0, i32 %a1) {
; CHECK-LABEL: @elts_test_vpermd(
; CHECK-NEXT: [[TMP1:%.*]] = insertelement <8 x i32> <i32 undef, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i32 %a1, i32 0
; CHECK-NEXT: [[TMP2:%.*]] = tail call <8 x i32> @llvm.x86.avx2.permd(<8 x i32> %a0, <8 x i32> [[TMP1]])
; CHECK-NEXT: ret <8 x i32> [[TMP2]]
;
%1 = insertelement <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i32 %a1, i32 0
%2 = tail call <8 x i32> @llvm.x86.avx2.permd(<8 x i32> %a0, <8 x i32> %1)
%3 = shufflevector <8 x i32> %2, <8 x i32> undef, <8 x i32> <i32 undef, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
ret <8 x i32> %3
}
define <8 x float> @elts_test_vpermps(<8 x float> %a0, <8 x i32> %a1) {
; CHECK-LABEL: @elts_test_vpermps(
; CHECK-NEXT: [[TMP1:%.*]] = insertelement <8 x i32> %a1, i32 0, i32 7
; CHECK-NEXT: [[TMP2:%.*]] = tail call <8 x float> @llvm.x86.avx2.permps(<8 x float> %a0, <8 x i32> [[TMP1]])
; CHECK-NEXT: [[TMP3:%.*]] = shufflevector <8 x float> [[TMP2]], <8 x float> undef, <8 x i32> zeroinitializer
; CHECK-NEXT: ret <8 x float> [[TMP3]]
;
%1 = insertelement <8 x i32> %a1, i32 0, i32 7
%2 = tail call <8 x float> @llvm.x86.avx2.permps(<8 x float> %a0, <8 x i32> %1)
%3 = shufflevector <8 x float> %2, <8 x float> undef, <8 x i32> zeroinitializer
ret <8 x float> %3
}
declare <8 x i32> @llvm.x86.avx2.permd(<8 x i32>, <8 x i32>)
declare <8 x float> @llvm.x86.avx2.permps(<8 x float>, <8 x i32>)