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Allow speculating llvm.sqrt, fma and fmuladd

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This doesn't set errno, so this should be OK.
Also update the documentation to explicitly state
that errno are not set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200501 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-01-31 00:09:00 +00:00
parent 4b4b808860
commit e932091eb5
3 changed files with 67 additions and 2 deletions
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58
test/Transforms/SimplifyCFG/speculate-math.ll Normal file
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@@ -0,0 +1,58 @@
; RUN: opt -S -simplifycfg -phi-node-folding-threshold=2 < %s | FileCheck %s
declare float @llvm.sqrt.f32(float) nounwind readonly
declare float @llvm.fma.f32(float, float, float) nounwind readonly
declare float @llvm.fmuladd.f32(float, float, float) nounwind readonly
; CHECK-LABEL: @sqrt_test(
; CHECK: select
define void @sqrt_test(float addrspace(1)* noalias nocapture %out, float %a) nounwind {
entry:
%cmp.i = fcmp olt float %a, 0.000000e+00
br i1 %cmp.i, label %test_sqrt.exit, label %cond.else.i
cond.else.i: ; preds = %entry
%0 = tail call float @llvm.sqrt.f32(float %a) nounwind readnone
br label %test_sqrt.exit
test_sqrt.exit: ; preds = %cond.else.i, %entry
%cond.i = phi float [ %0, %cond.else.i ], [ 0x7FF8000000000000, %entry ]
store float %cond.i, float addrspace(1)* %out, align 4
ret void
}
; CHECK-LABEL: @fma_test(
; CHECK: select
define void @fma_test(float addrspace(1)* noalias nocapture %out, float %a, float %b, float %c) nounwind {
entry:
%cmp.i = fcmp olt float %a, 0.000000e+00
br i1 %cmp.i, label %test_fma.exit, label %cond.else.i
cond.else.i: ; preds = %entry
%0 = tail call float @llvm.fma.f32(float %a, float %b, float %c) nounwind readnone
br label %test_fma.exit
test_fma.exit: ; preds = %cond.else.i, %entry
%cond.i = phi float [ %0, %cond.else.i ], [ 0x7FF8000000000000, %entry ]
store float %cond.i, float addrspace(1)* %out, align 4
ret void
}
; CHECK-LABEL: @fmuladd_test(
; CHECK: select
define void @fmuladd_test(float addrspace(1)* noalias nocapture %out, float %a, float %b, float %c) nounwind {
entry:
%cmp.i = fcmp olt float %a, 0.000000e+00
br i1 %cmp.i, label %test_fmuladd.exit, label %cond.else.i
cond.else.i: ; preds = %entry
%0 = tail call float @llvm.fmuladd.f32(float %a, float %b, float %c) nounwind readnone
br label %test_fmuladd.exit
test_fmuladd.exit: ; preds = %cond.else.i, %entry
%cond.i = phi float [ %0, %cond.else.i ], [ 0x7FF8000000000000, %entry ]
store float %cond.i, float addrspace(1)* %out, align 4
ret void
}