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rdar://12753946

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Implement rule : "x * (select cond 1.0, 0.0) -> select cond x, 0.0"


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170226 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Shuxin Yang
2012-12-14 18:46:06 +00:00
parent 63cab6c9d2
commit a5ed031fbc
2 changed files with 66 additions and 6 deletions
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40
test/Transforms/InstCombine/fast-math.ll
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@@ -3,19 +3,17 @@
; testing-case "float fold(float a) { return 1.2f * a * 2.3f; }"
; 1.2f and 2.3f is supposed to be fold.
define float @fold(float %a) {
fold:
%mul = fmul fast float %a, 0x3FF3333340000000
%mul1 = fmul fast float %mul, 0x4002666660000000
ret float %mul1
; CHECK: fold
; CHECK: @fold
; CHECK: fmul float %a, 0x4006147AE0000000
}
; Same testing-case as the one used in fold() except that the operators have
; fixed FP mode.
define float @notfold(float %a) {
notfold:
; CHECK: notfold
; CHECK: @notfold
; CHECK: %mul = fmul fast float %a, 0x3FF3333340000000
%mul = fmul fast float %a, 0x3FF3333340000000
%mul1 = fmul float %mul, 0x4002666660000000
@@ -23,10 +21,40 @@ notfold:
}
define float @fold2(float %a) {
fold2:
; CHECK: fold2
; CHECK: @fold2
; CHECK: fmul float %a, 0x4006147AE0000000
%mul = fmul float %a, 0x3FF3333340000000
%mul1 = fmul fast float %mul, 0x4002666660000000
ret float %mul1
}
; rdar://12753946: x * cond ? 1.0 : 0.0 => cond ? x : 0.0
define double @select1(i32 %cond, double %x, double %y) {
%tobool = icmp ne i32 %cond, 0
%cond1 = select i1 %tobool, double 1.000000e+00, double 0.000000e+00
%mul = fmul nnan nsz double %cond1, %x
%add = fadd double %mul, %y
ret double %add
; CHECK: @select1
; CHECK: select i1 %tobool, double %x, double 0.000000e+00
}
define double @select2(i32 %cond, double %x, double %y) {
%tobool = icmp ne i32 %cond, 0
%cond1 = select i1 %tobool, double 0.000000e+00, double 1.000000e+00
%mul = fmul nnan nsz double %cond1, %x
%add = fadd double %mul, %y
ret double %add
; CHECK: @select2
; CHECK: select i1 %tobool, double 0.000000e+00, double %x
}
define double @select3(i32 %cond, double %x, double %y) {
%tobool = icmp ne i32 %cond, 0
%cond1 = select i1 %tobool, double 0.000000e+00, double 2.000000e+00
%mul = fmul nnan nsz double %cond1, %x
%add = fadd double %mul, %y
ret double %add
; CHECK: @select3
; CHECK: fmul nnan nsz double %cond1, %x
}