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[InstCombine] add fneg variation of shuffle-binop fold; NFC
If the fsub in this pattern was replaced by an actual fneg instruction, we would need to add a fold to recognize that because fneg would not be a binop. llvm-svn: 343041
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@ -913,6 +913,17 @@ define <2 x float> @fsub_splat_constant1(<2 x float> %x) {
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ret <2 x float> %r
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}
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define <2 x float> @fneg(<2 x float> %x) {
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; CHECK-LABEL: @fneg(
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; CHECK-NEXT: [[TMP1:%.*]] = fsub <2 x float> <float -0.000000e+00, float undef>, [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = shufflevector <2 x float> [[TMP1]], <2 x float> undef, <2 x i32> zeroinitializer
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; CHECK-NEXT: ret <2 x float> [[R]]
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;
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%splat = shufflevector <2 x float> %x, <2 x float> undef, <2 x i32> zeroinitializer
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%r = fsub <2 x float> <float -0.0, float -0.0>, %splat
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ret <2 x float> %r
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}
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define <2 x float> @fmul_splat_constant(<2 x float> %x) {
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; CHECK-LABEL: @fmul_splat_constant(
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; CHECK-NEXT: [[TMP1:%.*]] = fmul <2 x float> [[X:%.*]], <float 4.200000e+01, float undef>
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