Skip to content

[X86][DAGCombiner] Skip x87 fp80 values in combineFMulOrFDivWithIntPow2 #128618

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 4 commits into from
Feb 25, 2025
Merged

[X86][DAGCombiner] Skip x87 fp80 values in combineFMulOrFDivWithIntPow2 #128618

Changes from 1 commit
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
53eea16
[X86][DAGCombiner] Add pre-commit tests. NFC.
dtcxzyw Feb 25, 2025
2ea93f9
[X86][DAGCombiner] Skip x87 f80 values in `combineFMulOrFDivWithIntPow2`
dtcxzyw Feb 25, 2025
31b19aa
[DAGCombiner] Do not use IR types
dtcxzyw Feb 25, 2025
392249f
[ADT] Add a helper "APFloat::isIEEELikeFP"
dtcxzyw Feb 25, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 3 additions & 2 deletions llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17271,8 +17271,9 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) {
// prefer it.
SDValue DAGCombiner::combineFMulOrFDivWithIntPow2(SDNode *N) {
EVT VT = N->getValueType(0);
if (!Type::getFloatingPointTy(*DAG.getContext(), VT.getFltSemantics())
->isIEEELikeFPTy())
const fltSemantics &Sem = VT.getFltSemantics();
if (&Sem == &APFloat::x87DoubleExtended() ||
&Sem == &APFloat::PPCDoubleDouble())
return SDValue();

SDValue ConstOp, Pow2Op;
Expand Down