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[x86][AArch64] add tests for fmul-fma combine; NFC

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As discussed in D80801, there's a possible overstep in
what is allowed by the 'contract' fast-math-flag.
This commit is contained in:
Sanjay Patel 2020-06-24 15:54:22 -04:00
parent 56b530d92c
commit 26fd3ffa78
2 changed files with 38 additions and 0 deletions
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13
llvm/test/CodeGen/AArch64/fadd-combines.ll
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@ -207,6 +207,19 @@ define double @fadd_fma_fmul_1(double %a, double %b, double %c, double %d, doubl
ret double %a2
}
define float @fadd_fma_fmul_fmf(float %a, float %b, float %c, float %d, float %n0) nounwind {
; CHECK-LABEL: fadd_fma_fmul_fmf:
; CHECK: // %bb.0:
; CHECK-NEXT: fmadd s2, s2, s3, s4
; CHECK-NEXT: fmadd s0, s0, s1, s2
; CHECK-NEXT: ret
%m1 = fmul float %a, %b
%m2 = fmul float %c, %d
%a1 = fadd contract float %m1, %m2
%a2 = fadd reassoc float %n0, %a1
ret float %a2
}
; Minimum FMF, commute final add operands, change type.
define float @fadd_fma_fmul_2(float %a, float %b, float %c, float %d, float %n0) nounwind {

25
llvm/test/CodeGen/X86/fma_patterns.ll
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@ -1821,6 +1821,31 @@ define double @fadd_fma_fmul_1(double %a, double %b, double %c, double %d, doubl
ret double %a2
}
define float @fadd_fma_fmul_fmf(float %a, float %b, float %c, float %d, float %n0) nounwind {
; FMA-LABEL: fadd_fma_fmul_fmf:
; FMA: # %bb.0:
; FMA-NEXT: vfmadd213ss {{.*#+}} xmm2 = (xmm3 * xmm2) + xmm4
; FMA-NEXT: vfmadd213ss {{.*#+}} xmm0 = (xmm1 * xmm0) + xmm2
; FMA-NEXT: retq
;
; FMA4-LABEL: fadd_fma_fmul_fmf:
; FMA4: # %bb.0:
; FMA4-NEXT: vfmaddss {{.*#+}} xmm2 = (xmm2 * xmm3) + xmm4
; FMA4-NEXT: vfmaddss {{.*#+}} xmm0 = (xmm0 * xmm1) + xmm2
; FMA4-NEXT: retq
;
; AVX512-LABEL: fadd_fma_fmul_fmf:
; AVX512: # %bb.0:
; AVX512-NEXT: vfmadd213ss {{.*#+}} xmm2 = (xmm3 * xmm2) + xmm4
; AVX512-NEXT: vfmadd213ss {{.*#+}} xmm0 = (xmm1 * xmm0) + xmm2
; AVX512-NEXT: retq
%m1 = fmul float %a, %b
%m2 = fmul float %c, %d
%a1 = fadd contract float %m1, %m2
%a2 = fadd reassoc float %n0, %a1
ret float %a2
}
; Minimum FMF, commute final add operands, change type.
define float @fadd_fma_fmul_2(float %a, float %b, float %c, float %d, float %n0) nounwind {