diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyCFG.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp index 9644ba31f4d..ab1a474db9a 100644 --- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp @@ -1404,10 +1404,16 @@ HoistTerminator: // These values do not agree. Insert a select instruction before NT // that determines the right value. SelectInst *&SI = InsertedSelects[std::make_pair(BB1V, BB2V)]; - if (!SI) + if (!SI) { + // Propagate fast-math-flags from phi node to its replacement select. + IRBuilder<>::FastMathFlagGuard FMFGuard(Builder); + if (isa<FPMathOperator>(PN)) + Builder.setFastMathFlags(PN.getFastMathFlags()); + SI = cast<SelectInst>( Builder.CreateSelect(BI->getCondition(), BB1V, BB2V, BB1V->getName() + "." + BB2V->getName(), BI)); + } // Make the PHI node use the select for all incoming values for BB1/BB2 for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i) |
