[Bug target/126685] [17 regression] grub fails to assemble with broken __builtin_bswap64 expansion (Error: incorrect register `%eax' used with `w' suffix)

"cvs-commit at gcc dot gnu.org via Gcc-bugs" <[email protected]> Thu, 06 Aug 2026 14:31:00 +0000

Newsgroups	gmane.comp.gcc.bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126685

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Uros Bizjak <[email protected]>:

https://gcc.gnu.org/g:d55b88505c7eace3b5476d021af52b996407cae3

commit r17-3039-gd55b88505c7eace3b5476d021af52b996407cae3
Author: Uros Bizjak <[email protected]>
Date:   Thu Aug 6 16:12:38 2026 +0200

    i386: Use %w operand modifier for ROLW bswaphisi2_lowpart alternative
[PR126685]

            PR target/126685

    gcc/ChangeLog:

            * config/i386/i386.md (bswaphisi2_lowpart): Use %w operand
            modifier to emit HImode register name for ROLW alternative.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr126685.c: New test.