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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
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; fsub 0, (fsub 0, X) ==> X
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; CHECK: @fsub_0_0_x
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define float @fsub_0_0_x(float %a) {
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%t1 = fsub float -0.0, %a
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%ret = fsub float -0.0, %t1
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; CHECK: ret float %a
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ret float %ret
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}
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; fsub X, 0 ==> X
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; CHECK: @fsub_x_0
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define float @fsub_x_0(float %a) {
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%ret = fsub float %a, 0.0
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; CHECK ret float %a
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ret float %ret
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}
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; fadd X, -0 ==> X
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; CHECK: @fadd_x_n0
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define float @fadd_x_n0(float %a) {
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%ret = fadd float %a, -0.0
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; CHECK ret float %a
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ret float %ret
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}
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; fmul X, 1.0 ==> X
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; CHECK: @fmul_X_1
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define double @fmul_X_1(double %a) {
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%b = fmul double 1.000000e+00, %a ; <double> [#uses=1]
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; CHECK: ret double %a
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ret double %b
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}
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