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[ConstantFold] Special case log1p +/-0.0 #114635

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Merged
merged 2 commits into from
Nov 3, 2024
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[ConstantFold] Special case log1p +/-0.0 #114635

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e241093
Revert "[AIX][test] XFAIL constant folding log1p test"
hubert-reinterpretcast Nov 2, 2024
c87de4c
[ConstantFold] Special case log1p +/-0.0
hubert-reinterpretcast Nov 2, 2024
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3 changes: 3 additions & 0 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2407,6 +2407,9 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
break;
case LibFunc_log1p:
case LibFunc_log1pf:
// Implement optional behavior from C's Annex F for +/-0.0.
if (U.isZero())
return ConstantFP::get(Ty->getContext(), U);
if (APF > APFloat::getOne(APF.getSemantics(), true) && TLI->has(Func))
return ConstantFoldFP(log1p, APF, Ty);
break;
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1 change: 0 additions & 1 deletion llvm/test/Transforms/InstCombine/log1p.ll
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@@ -1,4 +1,3 @@
; XFAIL: target={{.*}}-aix{{.*}}
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

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