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

Jump to bottom

X | Y s>= 0 implies ssub(X, Y) no overflow #83

Open

dtcxzyw opened this issue Dec 9, 2024 · 0 comments

Labels

missed-optimization

Owner

dtcxzyw commented Dec 9, 2024

https://alive2.llvm.org/ce/z/uWX3uv

define i1 @src5(i64 noundef %0, i64 noundef %1) {
entry:
  %3 = tail call { i64, i1 } @llvm.ssub.with.overflow.i64(i64 %1, i64 %0)
  %4 = extractvalue { i64, i1 } %3, 1
  %5 = or i64 %1, %0
  %6 = icmp sgt i64 %5, -1
  tail call void @llvm.assume(i1 %6)
  ret i1 %4
}
define i1 @tgt5(i64 %0, i64 %1) {
entry:
  ret i1 false
}

tests/image-rs/optimized/2ndzmzcdt55acj4k.ll

The text was updated successfully, but these errors were encountered:

dtcxzyw added the missed-optimization label

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment