https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103307
Bug ID: 103307
Summary: Unused "%!" before return
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com
Target Milestone: ---
Target: i386, x86-64
x86 backend has
i386.c: output_asm_insn ("%!ret", NULL);
i386.c: return "%!ret";
i386.md: "%!ret\t%0"
Before MPX was removed, "%!" was mapped to
case '!':
if (ix86_bnd_prefixed_insn_p (current_output_insn))
fputs ("bnd ", file);
return;
After CET was added and MPX was removed, "%!" was mapped to
case '!':
if (ix86_notrack_prefixed_insn_p (current_output_insn))
fputs ("notrack ", file);
return;
ix86_notrack_prefixed_insn_p always returns false on RET since the
notrack prefix is only for indirect branches. Therefore, "%!" before
RET is unused.
