https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109258
--- Comment #6 from CVS 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:5450833e4f9993f81ac16cbbcf4e46881a519f85 commit r13-6847-g5450833e4f9993f81ac16cbbcf4e46881a519f85 Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Mar 24 10:38:42 2023 +0100 builtins: Fix up ICE in inline_string_cmp [PR109258] The PR109086 r13-6690 inline_string_cmp change to if (diff != result) emit_move_insn (result, diff); regressed FAIL: go.test/test/fixedbugs/bug207.go, -O2 -g (internal compiler error: in emit_move_insn, at expr.cc:4224) The problem is the Go FE doesn't mark __builtin_memcmp as pure (I'll also send patch for that) and so result is const0_rtx when the call lost its lhs and the above move ICEs because moving something into const0_rtx is obviously invalid. I think it is better not to rely on all FEs having these *cmp functions pure anD DCE being performed. The following patch just punts from the inline expansion in that case, so we just emit normal library call. 2023-03-24 Jakub Jelinek <ja...@redhat.com> PR middle-end/109258 * builtins.cc (inline_expand_builtin_bytecmp): Return NULL_RTX early if target == const0_rtx.
