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[x86]Add a test case to show missed vfnmadd generation. 

llvm-svn: 336404
This commit is contained in:
Easwaran Raman 2018-07-06 00:31:33 +00:00
parent a5bdba4fa5
commit 4832b9ea6b
1 changed files with 25 additions and 0 deletions
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25
llvm/test/CodeGen/X86/avx2-fma-fneg-combine.ll
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@ -142,4 +142,29 @@ entry:
}
define <8 x float> @test8(float %a, <8 x float> %b, <8 x float> %c) {
; X32-LABEL: test8:
; X32: # %bb.0: # %entry
; X32-NEXT: vmovss {{.*#+}} xmm2 = mem[0],zero,zero,zero
; X32-NEXT: vbroadcastss {{.*#+}} xmm3 = [-0,-0,-0,-0]
; X32-NEXT: vxorps %xmm3, %xmm2, %xmm2
; X32-NEXT: vbroadcastss %xmm2, %ymm2
; X32-NEXT: vfmadd213ps {{.*#+}} ymm0 = (ymm2 * ymm0) + ymm1
; X32-NEXT: retl
;
; X64-LABEL: test8:
; X64: # %bb.0: # %entry
; X64-NEXT: vbroadcastss {{.*#+}} xmm3 = [-0,-0,-0,-0]
; X64-NEXT: vxorps %xmm3, %xmm0, %xmm0
; X64-NEXT: vbroadcastss %xmm0, %ymm0
; X64-NEXT: vfmadd213ps {{.*#+}} ymm0 = (ymm1 * ymm0) + ymm2
; X64-NEXT: retq
entry:
%0 = fsub float -0.0, %a
%1 = insertelement <8 x float> undef, float %0, i32 0
%2 = shufflevector <8 x float> %1, <8 x float> undef, <8 x i32> zeroinitializer
%3 = tail call <8 x float> @llvm.fma.v8f32(<8 x float> %2, <8 x float> %b, <8 x float> %c)
ret <8 x float> %3
}
declare <8 x float> @llvm.fma.v8f32(<8 x float> %a, <8 x float> %b, <8 x float> %c)