https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98601
Alex Coplan <acoplan at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Last reconfirmed| |2021-03-31 Keywords| |ice-on-valid-code --- Comment #4 from Alex Coplan <acoplan at gcc dot gnu.org> --- richi: thanks for the pointers. I agree it looks like this should be valid. E.g. the very reasonable: void foo(void *p) { asm volatile ("str xzr, %0" : "=Q"(*p)); } gives: foo: str xzr, [x0] ret at -O2 on AArch64. (Dropping the volatile in this case reproduce the ICE.) I bisected the ICE to r8-7484-g532c7a45847f3401e26fa2f07e52613891c80718: commit 532c7a45847f3401e26fa2f07e52613891c80718 Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Mar 23 20:55:40 2018 re PR inline-asm/85022 (internal compiler error: in write_dependence_p, at alias.c:3003) PR inline-asm/85022 * emit-rtl.c (init_emit_regs): Indicate that VOIDmode MEMs don't have known size by default.