Skip to content

[flang] Fix spurious overflow warning folding exponentiation by integ… #88188

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 1 commit into from
Apr 22, 2024
Merged

[flang] Fix spurious overflow warning folding exponentiation by integ… #88188

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
6 changes: 4 additions & 2 deletions flang/lib/Evaluate/int-power.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,10 @@ ValueWithRealFlags<REAL> TimesIntPowerOf(const REAL &factor, const REAL &base,
REAL squares{base};
int nbits{INT::bits - absPower.LEADZ()};
for (int j{0}; j < nbits; ++j) {
if (j > 0) { // avoid spurious overflow on last iteration
squares =
squares.Multiply(squares, rounding).AccumulateFlags(result.flags);
}
if (absPower.BTEST(j)) {
if (negativePower) {
result.value = result.value.Divide(squares, rounding)
Expand All @@ -42,8 +46,6 @@ ValueWithRealFlags<REAL> TimesIntPowerOf(const REAL &factor, const REAL &base,
.AccumulateFlags(result.flags);
}
}
squares =
squares.Multiply(squares, rounding).AccumulateFlags(result.flags);
}
}
return result;
Expand Down