https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116891
--- Comment #17 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-13 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:e599311147332567d8d8c8c457fe5f6c2de64fe0 commit r13-9319-ge599311147332567d8d8c8c457fe5f6c2de64fe0 Author: Jakub Jelinek <ja...@redhat.com> Date: Tue Oct 15 19:38:46 2024 +0200 match.pd: Further fma negation fixes [PR116891] On Mon, Oct 14, 2024 at 08:53:29AM +0200, Jakub Jelinek wrote: > > PR middle-end/116891 > > * match.pd ((negate (IFN_FNMS@3 @0 @1 @2)) -> (IFN_FMA @0 @1 @2)): > > Only enable for !HONOR_SIGN_DEPENDENT_ROUNDING. > > Guess it would be nice to have a testcase which FAILs without the patch and > PASSes with it, but it can be added later. I've added such a testcase now, and additionally found the fix only fixed one of the 4 problematic similar cases. Here is a patch which fixes the others too and adds the testcases. fma-pr116891.c FAILed without your patch, FAILs with your patch too (but only due to the bar/baz/qux checks) and PASSes with the patch. 2024-10-15 Jakub Jelinek <ja...@redhat.com> PR middle-end/116891 * match.pd ((negate (fmas@3 @0 @1 @2)) -> (IFN_FNMS @0 @1 @2)): Only enable for !HONOR_SIGN_DEPENDENT_ROUNDING. ((negate (IFN_FMS@3 @0 @1 @2)) -> (IFN_FNMA @0 @1 @2)): Likewise. ((negate (IFN_FNMA@3 @0 @1 @2)) -> (IFN_FMS @0 @1 @2)): Likewise. * gcc.dg/pr116891.c: New test. * gcc.target/i386/fma-pr116891.c: New test. (cherry picked from commit 4366f0c7e296ea0d7279343c9b0a1d597588a1da)
