[Bug middle-end/67327] New: Missed tail call with __noreturn__ attribute

hjl.tools at gmail dot com gcc-bugzilla@gcc.gnu.org
Sun Aug 23 13:33:00 GMT 2015


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67327

            Bug ID: 67327
           Summary: Missed tail call with __noreturn__ attribute
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

[hjl@gnu-tools-1 tmp]$ cat x.c 
extern void xxx (void) __attribute__ ((__noreturn__));
void
foo (int len)
{
  if (len)
    xxx ();
}
[hjl@gnu-tools-1 tmp]$ gcc -S -O2 x.c
[hjl@gnu-tools-1 tmp]$ cat x.s
        .file   "x.c"
        .section        .text.unlikely,"ax",@progbits
.LCOLDB0:
        .text
.LHOTB0:
        .p2align 4,,15
        .globl  foo
        .type   foo, @function
foo:
.LFB0:
        .cfi_startproc
        testl   %edi, %edi
        jne     .L6
        rep ret
.L6:
        pushq   %rax
        .cfi_def_cfa_offset 16
        call    xxx
        .cfi_endproc
.LFE0:
        .size   foo, .-foo
        .section        .text.unlikely
.LCOLDE0:
        .text
.LHOTE0:
        .ident  "GCC: (GNU) 5.2.1 20150716 (Red Hat 5.2.1-1)"
        .section        .note.GNU-stack,"",@progbits
[hjl@gnu-tools-1 tmp]$



More information about the Gcc-bugs mailing list