https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116544
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jeff Law <l...@gcc.gnu.org>: https://gcc.gnu.org/g:0562976d62e095f3a00c799288dee4e5b20114e2 commit r15-3360-g0562976d62e095f3a00c799288dee4e5b20114e2 Author: Jeff Law <j...@ventanamicro.com> Date: Sun Sep 1 22:16:04 2024 -0600 [committed][PR rtl-optimization/116544] Fix test for promoted subregs This is a small bug in the ext-dce code's handling of promoted subregs. Essentially when we see a promoted subreg we need to make additional bit groups live as various parts of the RTL path know that an extension of a suitably promoted subreg can be trivially eliminated. When I added support for dealing with this quirk I failed to account for the larger modes properly and it ignored the case when the size of the inner object was > 32 bits. Opps. This does _not_ fix the outstanding x86 issue. That's caused by something completely different and more concerning ;( Bootstrapped and regression tested on x86. Obviously fixes the testcase on riscv as well. Pushing to the trunk. PR rtl-optimization/116544 gcc/ * ext-dce.cc (ext_dce_process_uses): Fix thinko in promoted subreg handling. gcc/testsuite/ * gcc.dg/torture/pr116544.c: New test.
