Skip to content

[InstCombine] recognize missed i128 split optimization #129363

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 8 commits into from
Mar 6, 2025
Merged

[InstCombine] recognize missed i128 split optimization #129363

Changes from 1 commit
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
eb3a1f1
[InstCombine] recognize missed i128 split optimization
bassiounix Mar 1, 2025
5e37f32
fix: update pattern constant source
bassiounix Mar 1, 2025
899c8d5
add(InstCombine): tests for the ext optimization
bassiounix Mar 1, 2025
efd069d
chore(test): rename test file
bassiounix Mar 2, 2025
d8ef2ec
chore(InstCombine): add more types to the test
bassiounix Mar 2, 2025
cc1e8cc
add(InstCombine): negative test for ext split optimization
bassiounix Mar 2, 2025
4e423c6
fix(style): change variable names to be readable
bassiounix Mar 2, 2025
aa83856
chore(InstCombine): add comments describing the pattern
bassiounix Mar 5, 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
7 changes: 7 additions & 0 deletions llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3119,6 +3119,13 @@ static Value *matchOrConcat(Instruction &Or, InstCombiner::BuilderTy &Builder) {
match(UpperSrc, m_BitReverse(m_Value(UpperBRev))))
return ConcatIntrinsicCalls(Intrinsic::bitreverse, UpperBRev, LowerBRev);

Value *X;
if (match(LowerSrc, m_SExt(m_Value(X))) &&
match(UpperSrc,
m_SExt(m_AShr(m_Specific(X), m_SpecificInt(HalfWidth / 2 - 1))))) {
return Builder.CreateSExt(X, Ty);
}

return nullptr;
}

Expand Down