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| author | AZero13 <gfunni234@gmail.com> | 2025-06-12 16:02:51 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-06-12 21:02:51 +0100 |
| commit | c19e900ce8b422f6b8c028fbbd9ef7e9d3720236 (patch) | |
| tree | da43293575553fc42990e2acccc36cb9d0166429 /lldb/source/Target/Target.cpp | |
| parent | cbf27bf711c08c34185f05ca5edbfa61bd3786e2 (diff) | |
[AArch64] Signed comparison using CMN is safe when the subtraction is nsw (#141993)
nsw means no signed wrap, and 0 - INT_MIN is a signed wrap.
Now, this is going to be a point I need to get out of the way:
So is it okay to always transform a > -b into cmn if it is a signed
comparison, even if b is INT_MIN because -INT_MIN is undefined, at least
in C, because unless fwrapv is specified, opt puts nsw on signed integer
operations, allowing for more folds anyway.
Diffstat (limited to 'lldb/source/Target/Target.cpp')
0 files changed, 0 insertions, 0 deletions