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https://github.com/c64scene-ar/llvm-6502.git
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c404e8208c
The heuristic used by DAGCombine to form FMAs checks that the FMUL has only one use, but this is overly-conservative on some systems. Specifically, if the FMA and the FADD have the same latency (and the FMA does not compete for resources with the FMUL any more than the FADD does), there is no need for the restriction, and furthermore, forming the FMA leaving the FMUL can still allow for higher overall throughput and decreased critical-path length. Here we add a new TLI callback, enableAggressiveFMAFusion, false by default, to elide the hasOneUse check. This is enabled for PowerPC by default, as most PowerPC systems will benefit. Patch by Olivier Sallenave, thanks! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218120 91177308-0d34-0410-b5e6-96231b3b80d8
93 lines
2.6 KiB
LLVM
93 lines
2.6 KiB
LLVM
; RUN: llc < %s -march=ppc32 -fp-contract=fast | FileCheck %s
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declare double @dummy1(double) #0
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declare double @dummy2(double, double) #0
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declare double @dummy3(double, double, double) #0
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define double @test_FMADD1(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fadd double %C, %D ; <double> [#uses=1]
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ret double %E
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; CHECK-LABEL: test_FMADD1:
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; CHECK: fmadd
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; CHECK-NEXT: blr
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}
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define double @test_FMADD2(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fadd double %D, %C ; <double> [#uses=1]
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ret double %E
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; CHECK-LABEL: test_FMADD2:
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; CHECK: fmadd
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; CHECK-NEXT: blr
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}
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define double @test_FMSUB1(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fsub double %D, %C ; <double> [#uses=1]
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ret double %E
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; CHECK-LABEL: test_FMSUB1:
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; CHECK: fmsub
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; CHECK-NEXT: blr
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}
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define double @test_FMSUB2(double %A, double %B, double %C, double %D) {
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%E = fmul double %A, %B ; <double> [#uses=2]
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%F = fadd double %E, %C ; <double> [#uses=1]
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%G = fsub double %E, %D ; <double> [#uses=1]
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%H = call double @dummy2(double %F, double %G) ; <double> [#uses=1]
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ret double %H
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; CHECK-LABEL: test_FMSUB2:
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; CHECK: fmadd
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; CHECK-NEXT: fmsub
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}
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define double @test_FNMADD1(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fadd double %D, %C ; <double> [#uses=1]
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%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
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ret double %F
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; CHECK-LABEL: test_FNMADD1:
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; CHECK: fnmadd
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; CHECK-NEXT: blr
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}
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define double @test_FNMADD2(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fadd double %C, %D ; <double> [#uses=1]
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%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
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ret double %F
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; CHECK-LABEL: test_FNMADD2:
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; CHECK: fnmadd
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; CHECK-NEXT: blr
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}
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define double @test_FNMSUB1(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fsub double %C, %D ; <double> [#uses=1]
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ret double %E
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; CHECK-LABEL: test_FNMSUB1:
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; CHECK: fnmsub
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; CHECK-NEXT: blr
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}
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define double @test_FNMSUB2(double %A, double %B, double %C) {
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%D = fmul double %A, %B ; <double> [#uses=1]
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%E = fsub double %D, %C ; <double> [#uses=1]
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%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
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ret double %F
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; CHECK-LABEL: test_FNMSUB2:
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; CHECK: fnmsub
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; CHECK-NEXT: blr
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}
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define float @test_FNMSUBS(float %A, float %B, float %C) {
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%D = fmul float %A, %B ; <float> [#uses=1]
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%E = fsub float %D, %C ; <float> [#uses=1]
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%F = fsub float -0.000000e+00, %E ; <float> [#uses=1]
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ret float %F
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; CHECK-LABEL: test_FNMSUBS:
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; CHECK: fnmsubs
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; CHECK-NEXT: blr
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}
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