https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94913
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Uros Bizjak <u...@gcc.gnu.org>: https://gcc.gnu.org/g:7c2879301d3b027a1ba427a5d5c7557decb8a7ab commit r11-145-g7c2879301d3b027a1ba427a5d5c7557decb8a7ab Author: Uros Bizjak <ubiz...@gmail.com> Date: Wed May 6 17:33:51 2020 +0200 i386: Use ADD to implement compares with negated operand [PR94913] Use carry flag from addition to implement GEU/LTU compares with negated operand, so e.g. ~x < y compiles to: addq %rsi, %rdi setc %al instead of: notq %rdi cmpq %rsi, %rdi setb %al PR target/94913 * config/i386/predicates.md (add_comparison_operator): New predicate. * config/i386/i386.md (compare->add splitter): New splitters. testsuite/ChangeLog: PR target/94913 * gcc.target/i386/pr94913-1.c: New test. * gcc.target/i386/pr94913-2.c: Ditto.