mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 16:31:16 +00:00
09ee250e72
fsub X, +0 ==> X
fsub X, -0 ==> X, when we know X is not -0
fsub +/-0.0, (fsub -0.0, X) ==> X
fsub nsz +/-0.0, (fsub +/-0.0, X) ==> X
fsub nnan ninf X, X ==> 0.0
fadd nsz X, 0 ==> X
fadd [nnan ninf] X, (fsub [nnan ninf] 0, X) ==> 0
where nnan and ninf have to occur at least once somewhere in this expression
fmul X, 1.0 ==> X
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169940 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
713 B
LLVM
36 lines
713 B
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
|
|
|
|
; fsub 0, (fsub 0, X) ==> X
|
|
; CHECK: @fsub_0_0_x
|
|
define float @fsub_0_0_x(float %a) {
|
|
%t1 = fsub float -0.0, %a
|
|
%ret = fsub float -0.0, %t1
|
|
|
|
; CHECK: ret float %a
|
|
ret float %ret
|
|
}
|
|
|
|
; fsub X, 0 ==> X
|
|
; CHECK: @fsub_x_0
|
|
define float @fsub_x_0(float %a) {
|
|
%ret = fsub float %a, 0.0
|
|
; CHECK ret float %a
|
|
ret float %ret
|
|
}
|
|
|
|
; fadd X, -0 ==> X
|
|
; CHECK: @fadd_x_n0
|
|
define float @fadd_x_n0(float %a) {
|
|
%ret = fadd float %a, -0.0
|
|
; CHECK ret float %a
|
|
ret float %ret
|
|
}
|
|
|
|
; fmul X, 1.0 ==> X
|
|
; CHECK: @fmul_X_1
|
|
define double @fmul_X_1(double %a) {
|
|
%b = fmul double 1.000000e+00, %a ; <double> [#uses=1]
|
|
; CHECK: ret double %a
|
|
ret double %b
|
|
}
|