maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

LICM: Reorder condition checks 

Check the fast math flag before the more expensive loop check.
This commit is contained in:
Matt Arsenault 2020-03-03 16:59:41 -05:00 committed by Matt Arsenault
parent 88aced1e45
commit f9047ede58
1 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
llvm/lib/Transforms/Scalar/LICM.cpp
View File

@ -818,9 +818,8 @@ bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
// Attempt to remove floating point division out of the loop by
// converting it to a reciprocal multiplication.
if (I.getOpcode() == Instruction::FDiv &&
CurLoop->isLoopInvariant(I.getOperand(1)) &&
I.hasAllowReciprocal()) {
if (I.getOpcode() == Instruction::FDiv && I.hasAllowReciprocal() &&
CurLoop->isLoopInvariant(I.getOperand(1))) {
auto Divisor = I.getOperand(1);
auto One = llvm::ConstantFP::get(Divisor->getType(), 1.0);
auto ReciprocalDivisor = BinaryOperator::CreateFDiv(One, Divisor);