https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116437
--- 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:cdc9cd4afe8949276a0c50215eb7f23e2086044f commit r15-3074-gcdc9cd4afe8949276a0c50215eb7f23e2086044f Author: Jeff Law <j...@ventanamicro.com> Date: Wed Aug 21 16:52:23 2024 -0600 [PR rtl-optimization/116437] Fix RTL checking issue in ext-dce Another RTL checking failure in ext-dce. An easy one to fix this time. When we optimize an extension we have to go back and cleanup with SUBREG_PROMOTED state. So we record the destination register into a bitmap as we make changes, then later do a single pass over the IL fixing any associated subreg expressions. The optimization is changing the SET_SRC and largely ignores the destination. The LHS could be a REG, SUBREG, or ZERO_EXTRACT. If the LHS is a SUBREG or ZERO_EXTRACT we can just strip them. Bootstrapped and ran the testsuite with an RTL checking compiler and verified no ext-dce RTL checking failures tripped. Also bootstrapped and regression tested x86_64 in the usual way. Pushing to the trunk. PR rtl-optimization/116437 gcc/ * ext-dce.cc (ext_dce_try_optimize_insn): Handle SUBREG and ZERO_EXTRACT destinations.
