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[AArch64] add tests for fadd -> fma combines; NFC 

The transform to create a final fma was added with:
D132837 / c98a46fee6

These tests are intended to show the minimal fast-math-flags
necessary to enable the fold: currently only the final fadd
needs to have "reassoc".
This commit is contained in:
Sanjay Patel 2022-09-21 08:56:25 -04:00
parent b84be9f2f1
commit ddd27a3d39
1 changed files with 32 additions and 0 deletions
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32
llvm/test/CodeGen/AArch64/fadd-combines.ll
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@ -315,5 +315,37 @@ define float @fadd_fma_fmul_extra_use_3(float %a, float %b, float %c, float %d,
ret float %a2
}
define float @fmac_sequence_innermost_fmul(float %a, float %b, float %c, float %d, float %e, float %f, float %g) {
; CHECK-LABEL: fmac_sequence_innermost_fmul:
; CHECK: // %bb.0:
; CHECK-NEXT: fmadd s0, s0, s1, s6
; CHECK-NEXT: fmadd s0, s2, s3, s0
; CHECK-NEXT: fmadd s0, s4, s5, s0
; CHECK-NEXT: ret
%t0 = fmul float %a, %b
%t1 = fmul contract float %c, %d
%t2 = fadd contract float %t0, %t1
%t3 = fmul contract float %e, %f
%t4 = fadd contract float %t2, %t3
%t5 = fadd contract reassoc float %t4, %g
ret float %t5
}
define float @fmac_sequence_innermost_fmul_intrinsics(float %a, float %b, float %c, float %d, float %e, float %f, float %g) {
; CHECK-LABEL: fmac_sequence_innermost_fmul_intrinsics:
; CHECK: // %bb.0:
; CHECK-NEXT: fmadd s0, s0, s1, s6
; CHECK-NEXT: fmadd s0, s2, s3, s0
; CHECK-NEXT: fmadd s0, s4, s5, s0
; CHECK-NEXT: ret
%t0 = fmul float %a, %b
%t1 = call float @llvm.fma.f32(float %c, float %d, float %t0)
%t2 = call float @llvm.fma.f32(float %e, float %f, float %t1)
%t5 = fadd contract reassoc float %t2, %g
ret float %t5
}
declare float @llvm.fma.f32(float, float, float)
declare void @use(double)