https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70243
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Michael Meissner <meiss...@gcc.gnu.org>: https://gcc.gnu.org/g:725bcdeec60771cb9ee387978716028b64ea1b7f commit r13-7132-g725bcdeec60771cb9ee387978716028b64ea1b7f Author: Michael Meissner <meiss...@linux.ibm.com> Date: Sun Apr 9 23:32:27 2023 -0400 Do not generate vmaddfp and vnmsubfp This is version 3 of the patch. This is essentially version 1 with the removal of changes to altivec.md, and cleanup of the comments. Version 2 generated the vmaddfp and vnmsubfp instructions if -Ofast was used, and those changes are deleted in this patch. The Altivec instructions vmaddfp and vnmsubfp have different rounding behaviors than the VSX xvmaddsp and xvnmsubsp instructions due to VSCR[NJ] and other corner cases. In particular, generating these instructions seems to break Eigen on big endian systems. 2023-04-09 Michael Meissner <meiss...@linux.ibm.com> gcc/ PR target/70243 * config/rs6000/vsx.md (vsx_fmav4sf4): Do not generate vmaddfp. (vsx_nfmsv4sf4): Do not generate vnmsubfp. gcc/testsuite/ PR target/70243 * gcc.target/powerpc/pr70243.c: New test.
