https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103910
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Andrew Pinski <pins...@gcc.gnu.org>: https://gcc.gnu.org/g:d243f4009d8071b734df16cd70f4c5d09a373769 commit r12-6274-gd243f4009d8071b734df16cd70f4c5d09a373769 Author: Andrew Pinski <apin...@marvell.com> Date: Wed Jan 5 22:00:07 2022 +0000 Fix target/103910: missing GTY on x86_mfence causing PCH usage to ICE With -O3 -march=opteron, a mfence builtin is added after the loop to say the nontemporal stores are no longer needed. This all good without precompiled headers as the function decl that is referneced by x86_mfence is referenced in another variable but with precompiled headers, x86_mfence is all messed up and the decl was GC'ed away. This fixes the problem by marking x86_mfence as GTY to save/restore during precompiled headers just like most other variables in the header file. Committed as obvious after a bootstrap/test on x86_64-linux-gnu. gcc/ChangeLog: PR target/103910 * config/i386/i386.h (x86_mfence): Mark with GTY.
