https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103548
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Peter Bergner <berg...@gcc.gnu.org>: https://gcc.gnu.org/g:15c02ab2569b3c4e27d6f133c013b15a9fa70177 commit r12-5969-g15c02ab2569b3c4e27d6f133c013b15a9fa70177 Author: Peter Bergner <berg...@linux.ibm.com> Date: Tue Dec 14 14:50:41 2021 -0600 rs6000: Do not allow combining of multiple assemble quads [PR103548] The compiler will gladly CSE the result of two __builtin_mma_build_acc calls with the same four vector arguments, leading to illegal MMA code being generated. The fix here is to make the mma_assemble_acc pattern use a unspec_volatile to stop the CSE from happening. 2021-12-14 Peter Bergner <berg...@linux.ibm.com> gcc/ PR target/103548 * config/rs6000/mma.md (UNSPEC_MMA_ASSEMBLE): Rename unspec from this... (UNSPEC_VSX_ASSEMBLE): ...to this. (UNSPECV_MMA_ASSEMBLE): New unspecv. (vsx_assemble_pair): Use UNSPEC_VSX_ASSEMBLE. (*vsx_assemble_pair): Likewise. (mma_assemble_acc): Use UNSPECV_MMA_ASSEMBLE. (*mma_assemble_acc): Likewise. * config/rs6000/rs6000.c (rs6000_split_multireg_move): Handle UNSPEC_VOLATILE. Use UNSPEC_VSX_ASSEMBLE and UNSPECV_MMA_ASSEMBLE. gcc/testsuite/ PR target/103548 * gcc.target/powerpc/mma-builtin-10-pair.c: New test. * gcc.target/powerpc/mma-builtin-10-quad.c: New test.
