mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
This patch adds DAG combines to form FMAs from pairs of FADD + FMUL or FSUB + FMUL. The combines are performed when: (a) Either AllowExcessFPPrecision option (-enable-excess-fp-precision for llc) OR UnsafeFPMath option (-enable-unsafe-fp-math) are set, and (b) TargetLoweringInfo::isFMAFasterThanMulAndAdd(VT) is true for the type of the FADD/FSUB, and (c) The FMUL only has one user (the FADD/FSUB). If your target has fast FMA instructions you can make use of these combines by overriding TargetLoweringInfo::isFMAFasterThanMulAndAdd(VT) to return true for types supported by your FMA instruction, and adding patterns to match ISD::FMA to your FMA instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158757 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.7 KiB
LLVM
55 lines
1.7 KiB
LLVM
; RUN: llc < %s -march=ppc32 -enable-excess-fp-precision | \
|
|
; RUN: egrep {fn?madd|fn?msub} | count 8
|
|
|
|
define double @test_FMADD1(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fadd double %D, %C ; <double> [#uses=1]
|
|
ret double %E
|
|
}
|
|
|
|
define double @test_FMADD2(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fadd double %D, %C ; <double> [#uses=1]
|
|
ret double %E
|
|
}
|
|
|
|
define double @test_FMSUB(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fsub double %D, %C ; <double> [#uses=1]
|
|
ret double %E
|
|
}
|
|
|
|
define double @test_FNMADD1(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fadd double %D, %C ; <double> [#uses=1]
|
|
%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
|
|
ret double %F
|
|
}
|
|
|
|
define double @test_FNMADD2(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fadd double %C, %D ; <double> [#uses=1]
|
|
%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
|
|
ret double %F
|
|
}
|
|
|
|
define double @test_FNMSUB1(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fsub double %C, %D ; <double> [#uses=1]
|
|
ret double %E
|
|
}
|
|
|
|
define double @test_FNMSUB2(double %A, double %B, double %C) {
|
|
%D = fmul double %A, %B ; <double> [#uses=1]
|
|
%E = fsub double %D, %C ; <double> [#uses=1]
|
|
%F = fsub double -0.000000e+00, %E ; <double> [#uses=1]
|
|
ret double %F
|
|
}
|
|
|
|
define float @test_FNMSUBS(float %A, float %B, float %C) {
|
|
%D = fmul float %A, %B ; <float> [#uses=1]
|
|
%E = fsub float %D, %C ; <float> [#uses=1]
|
|
%F = fsub float -0.000000e+00, %E ; <float> [#uses=1]
|
|
ret float %F
|
|
}
|