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.
40 lines
1.3 KiB
LLVM
40 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s --check-prefix=X86
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; RUN: llc < %s -mtriple=i686-unknown -mattr=+sse2 | FileCheck %s --check-prefix=X86-SSE
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; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s --check-prefix=X64
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define i1 @foo(i64 %a) {
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; X86-LABEL: foo:
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; X86: # %bb.0:
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; X86-NEXT: flds {{[0-9]+}}(%esp)
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; X86-NEXT: flds {{[0-9]+}}(%esp)
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; X86-NEXT: fucompp
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; X86-NEXT: fnstsw %ax
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; X86-NEXT: # kill: def $ah killed $ah killed $ax
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; X86-NEXT: sahf
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; X86-NEXT: setp %al
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; X86-NEXT: retl
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;
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; X86-SSE-LABEL: foo:
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; X86-SSE: # %bb.0:
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; X86-SSE-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
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; X86-SSE-NEXT: movaps %xmm0, %xmm1
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; X86-SSE-NEXT: shufps {{.*#+}} xmm1 = xmm1[1,1],xmm0[1,1]
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; X86-SSE-NEXT: ucomiss %xmm1, %xmm0
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; X86-SSE-NEXT: setp %al
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; X86-SSE-NEXT: retl
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;
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; X64-LABEL: foo:
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; X64: # %bb.0:
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; X64-NEXT: movq %rdi, %xmm0
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; X64-NEXT: pshufd {{.*#+}} xmm1 = xmm0[1,1,1,1]
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; X64-NEXT: ucomiss %xmm1, %xmm0
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; X64-NEXT: setp %al
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; X64-NEXT: retq
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%t = bitcast i64 %a to <2 x float>
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%r = extractelement <2 x float> %t, i32 0
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%s = extractelement <2 x float> %t, i32 1
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%b = fcmp uno float %r, %s
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ret i1 %b
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}
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