[Bug target/97873] Failure to optimize abs optimally (at least one completely useless instruction on x86)

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97873

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 49588
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49588&action=edit
Proposed patch

Attached patch introduces relevant peephole2 pattern (and fixes some other
issues).