https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80492
--- Comment #12 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Richard Biener from comment #10) > But I really wonder if it is ok to omit constraints from the asm marking > the register variable as changed. The register is not changed in the asm, please note that the testcase intentionally changes the value of the register before each asm.