https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89316
--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Uros Bizjak <u...@gcc.gnu.org>: https://gcc.gnu.org/g:2f3f8952ff1736dd6a087ddb4106077db3502bb9 commit r14-5784-g2f3f8952ff1736dd6a087ddb4106077db3502bb9 Author: Uros Bizjak <ubiz...@gmail.com> Date: Thu Nov 23 15:45:59 2023 +0100 i386: Fix ICE with -mforce-indirect-call and -fsplit-stack [PR89316] With the above two options, use a temporary register regno (as returned from split_stack_prologue_scratch_regno) as an indirect call scratch register to hold __morestack function address. On 64-bit targets, two temporary registers are always available, so load the function addres in %r11 and call __morestack_large_model with its one-argument-register value rn %r10. On 32-bit targets, bail out with a "sorry" if the temporary register can not be obtained. On 32-bit targets, also emit PIC sequence that re-uses the obtained indirect call scratch register before moving the function address to it. We can not set up %ebx PIC register in this case, but __morestack is prepared for this situation and sets it up by itself. PR target/89316 gcc/ChangeLog: * config/i386/i386.cc (ix86_expand_split_stack_prologue): Obtain scratch regno when flag_force_indirect_call is set. On 64-bit targets, call __morestack_large_model when flag_force_indirect_call is set and on 32-bit targets with -fpic, manually expand PIC sequence to call __morestack. Move the function address to an indirect call scratch register. gcc/testsuite/ChangeLog: * g++.target/i386/pr89316.C: New test. * gcc.target/i386/pr112605-1.c: New test. * gcc.target/i386/pr112605-2.c: New test. * gcc.target/i386/pr112605.c: New test.
