0c005be6eb
If the mask input to getV4X86ShuffleImm8 only refers to a single source element (+ undefs) then canonicalize to a full broadcast. getV4X86ShuffleImm8 defaults to inline values for undefs, which can be useful for shuffle widening/narrowing but does leave SimplifyDemanded* calls thinking the shuffle depends on unnecessary elements. I'm still investigating what we should do more generally to avoid these undemanded elements, but broadcast cases was a simpler win.
42 lines
1.5 KiB
LLVM
42 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-linux-pc -mcpu=corei7 | FileCheck %s
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declare <4 x i32> @llvm.x86.sse41.pminud(<4 x i32>, <4 x i32>)
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define <2 x i16> @good(<4 x i32>*, <4 x i8>*) {
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; CHECK-LABEL: good:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movdqa (%rdi), %xmm0
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; CHECK-NEXT: pminud {{.*}}(%rip), %xmm0
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; CHECK-NEXT: retq
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entry:
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%2 = load <4 x i32>, <4 x i32>* %0, align 16
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%3 = call <4 x i32> @llvm.x86.sse41.pminud(<4 x i32> %2, <4 x i32> <i32 127, i32 127, i32 127, i32 127>)
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%4 = extractelement <4 x i32> %3, i32 0
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%5 = extractelement <4 x i32> %3, i32 1
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%6 = extractelement <4 x i32> %3, i32 2
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%7 = extractelement <4 x i32> %3, i32 3
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%8 = bitcast i32 %4 to <2 x i16>
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%9 = bitcast i32 %5 to <2 x i16>
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ret <2 x i16> %8
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}
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define <2 x i16> @bad(<4 x i32>*, <4 x i8>*) {
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; CHECK-LABEL: bad:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movdqa (%rdi), %xmm0
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; CHECK-NEXT: pminud {{.*}}(%rip), %xmm0
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; CHECK-NEXT: pshufd {{.*#+}} xmm0 = xmm0[1,1,1,1]
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; CHECK-NEXT: retq
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entry:
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%2 = load <4 x i32>, <4 x i32>* %0, align 16
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%3 = call <4 x i32> @llvm.x86.sse41.pminud(<4 x i32> %2, <4 x i32> <i32 127, i32 127, i32 127, i32 127>)
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%4 = extractelement <4 x i32> %3, i32 0
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%5 = extractelement <4 x i32> %3, i32 1
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%6 = extractelement <4 x i32> %3, i32 2
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%7 = extractelement <4 x i32> %3, i32 3
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%8 = bitcast i32 %4 to <2 x i16>
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%9 = bitcast i32 %5 to <2 x i16>
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ret <2 x i16> %9
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}
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