https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120427
--- Comment #16 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by H.J. Lu <h...@gcc.gnu.org>: https://gcc.gnu.org/g:94ca071cba4078aa783e6c134277515a4e46709e commit r15-10164-g94ca071cba4078aa783e6c134277515a4e46709e Author: H.J. Lu <hjl.to...@gmail.com> Date: Tue Jul 29 11:22:35 2025 -0700 x86: Transform to "pushq $-1; popq reg" for -Oz commit 4c80062d7b8c272e2e193b8074a8440dbb4fe588 Author: H.J. Lu <hjl.to...@gmail.com> Date: Sun May 25 07:40:29 2025 +0800 x86: Enable *mov<mode>_(and|or) only for -Oz disabled transformation from "movq $-1,reg" to "pushq $-1; popq reg" for -Oz. But for legacy integer registers, the former is 4 bytes and the latter is 3 bytes. Enable such transformation for -Oz. gcc/ PR target/120427 * config/i386/i386.md (peephole2): Transform "movq $-1,reg" to "pushq $-1; popq reg" for -Oz if reg is a legacy integer register. gcc/testsuite/ PR target/120427 * gcc.target/i386/pr120427-5.c: New test. Signed-off-by: H.J. Lu <hjl.to...@gmail.com> (cherry picked from commit 71dae74158d05b75e367629ce21da3f0a2945576)
