https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112962
--- Comment #19 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:96e0b513717e25405aee36851d5164aab0d0403a commit r14-6743-g96e0b513717e25405aee36851d5164aab0d0403a Author: Jakub Jelinek <ja...@redhat.com> Date: Wed Dec 20 12:01:57 2023 +0100 i386: Make most MD builtins nothrow, leaf [PR112962] The following patch makes most of x86 MD builtins nothrow,leaf (like most middle-end builtins are). For -fnon-call-exceptions it doesn't nothrow, better might be to still add it if the builtins don't read or write memory and can't raise floating point exceptions, but we don't have such information readily available, so the patch uses just !flag_non_call_exceptions for now. Not sure if we shouldn't have some exceptions for the leaf attribute, e.g. wonder about EMMS/FEMMS and the various xsave/xrstor etc. builtins, pedantically none of those builtins do anything that leaf functions are forbidden to do (having callbacks, calling functions from current TU, longjump into the current TU), but sometimes non-leaf is also used on really complex functions to prevent some unwanted optimizations. That said, haven't run into any problems as is with the patch. 2023-12-20 Jakub Jelinek <ja...@redhat.com> PR target/112962 * config/i386/i386-builtins.cc (ix86_builtins): Increase by one element. (def_builtin): If not -fnon-call-exceptions, set TREE_NOTHROW on the builtin FUNCTION_DECL. Add leaf attribute to DECL_ATTRIBUTES. (ix86_add_new_builtins): Likewise.
