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[x86] add test for fneg matching failure; NFC 

llvm-svn: 343854
This commit is contained in:
Sanjay Patel 2018-10-05 14:49:20 +00:00
parent 6c5ab48fe7
commit b7d85655f7
1 changed files with 19 additions and 0 deletions
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19
llvm/test/CodeGen/X86/vec_fneg.ll
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@ -98,3 +98,22 @@ define <2 x float> @fneg_bitcast(i64 %i) nounwind {
%fneg = fsub <2 x float> <float -0.0, float -0.0>, %bitcast
ret <2 x float> %fneg
}
define <4 x float> @undef_elts_v4f32(<4 x float> %x) {
; X32-SSE-LABEL: undef_elts_v4f32:
; X32-SSE: # %bb.0:
; X32-SSE-NEXT: movaps {{.*#+}} xmm1 = <-0,u,u,-0>
; X32-SSE-NEXT: subps %xmm0, %xmm1
; X32-SSE-NEXT: movaps %xmm1, %xmm0
; X32-SSE-NEXT: retl
;
; X64-SSE-LABEL: undef_elts_v4f32:
; X64-SSE: # %bb.0:
; X64-SSE-NEXT: movaps {{.*#+}} xmm1 = <-0,u,u,-0>
; X64-SSE-NEXT: subps %xmm0, %xmm1
; X64-SSE-NEXT: movaps %xmm1, %xmm0
; X64-SSE-NEXT: retq
%r = fsub <4 x float> <float -0.0, float undef, float undef, float -0.0>, %x
ret <4 x float> %r
}