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Added a slew of SimplifyInstruction floating-point optimizations, many of which take advantage of fast-math flags. Test cases included.

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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
This commit is contained in:
Michael Ilseman
2012-12-12 00:27:46 +00:00
parent 1d4b150704
commit 09ee250e72
4 changed files with 230 additions and 10 deletions
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35
test/Transforms/InstSimplify/floating-point-arithmetic.ll Normal file
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; 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
}