================
@@ -1875,13 +1873,17 @@ Instruction *InstCombinerImpl::visitFPTrunc(FPTruncInst
&FPT) {
// fptrunc (select Cond, (fpext X), Y --> select Cond, X, (fptrunc Y)
Value *NarrowY = Builder.CreateFPTrunc(Y, Ty);
Value *Sel = Builder.CreateSelect(Cond, X, NarrowY, "narrow.sel", Op);
+ if (auto *I = dyn_cast<Instruction>(Sel))
+ I->setFastMathFlags(Op->getFastMathFlags());
return replaceInstUsesWith(FPT, Sel);
}
if (match(Op, m_Select(m_Value(Cond), m_Value(Y), m_FPExt(m_Value(X)))) &&
X->getType() == Ty) {
// fptrunc (select Cond, Y, (fpext X) --> select Cond, (fptrunc Y), X
Value *NarrowY = Builder.CreateFPTrunc(Y, Ty);
Value *Sel = Builder.CreateSelect(Cond, NarrowY, X, "narrow.sel", Op);
+ if (auto *I = dyn_cast<Instruction>(Sel))
+ I->setFastMathFlags(Op->getFastMathFlags());
----------------
john-brawn-arm wrote:
IRBuilder::CreateSelect uses the default fast math flags of the IRBuilder,
which will be the flags of the fptrunc. So we need this to make sure the new
select has the same flags as the old select.
https://github.com/llvm/llvm-project/pull/115894
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
