Skip to content

[ValueTracking] Range of cmp intrinsics are -1, 0, and 1 #144365

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

Closed
AZero13 wants to merge 1 commit into from
Closed

[ValueTracking] Range of cmp intrinsics are -1, 0, and 1 #144365

Changes from all commits
Commits
Show all changes
1 commit
Select commit
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
4 changes: 4 additions & 0 deletions llvm/lib/Analysis/ValueTracking.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9785,6 +9785,10 @@ static ConstantRange getRangeForIntrinsic(const IntrinsicInst &II,
unsigned Width = II.getType()->getScalarSizeInBits();
const APInt *C;
switch (II.getIntrinsicID()) {
case Intrinsic::scmp:
case Intrinsic::ucmp:
return ConstantRange::getNonEmpty(APInt::getAllOnes(Width),
APInt::getOneBitSet(Width, 0));
case Intrinsic::ctlz:
case Intrinsic::cttz: {
APInt Upper(Width, Width);
Expand Down
Loading