http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49833
--- Comment #18 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-25 20:10:27
UTC ---
(In reply to comment #14)
> Another problem:
>
> [hjl@gnu-6 gcc]$ cat /tmp/bar.c
> typedef unsigned int Elf32_Addr;
> extern void _start (void);
> int
> dl_main ( Elf32_Addr *user_entry)
> {
> if (*user_entry == (Elf32_Addr) _start)
> return 0;
> else
> return 1;
> }
> [hjl@gnu-6 gcc]$ ./xgcc -B./ -S -O2 -fPIC /tmp/bar.c -mx32 -std=gnu99 -dp
> /tmp/bar.c: In function ‘dl_main’:
> /tmp/bar.c:10:1: error: unrecognizable insn:
> (insn 6 5 7 3 (set (reg:SI 67)
> (symbol_ref:SI ("_start") [flags 0x41] <function_decl 0x7faad972ff00
> _start>)) /tmp/bar.c:6 -1
> (nil))
> /tmp/bar.c:10:1: internal compiler error: in extract_insn, at recog.c:2115
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <http://gcc.gnu.org/bugs.html> for instructions.
> [hjl@gnu-6 gcc]$
On x32 branch, I got
.file "bar.c"
.text
.p2align 4,,15
.globl dl_main
.type dl_main, @function
dl_main:
.LFB0:
.cfi_startproc
movl _start@GOTPCREL(%rip), %eax # 22 *movsi_internal/1 [length
= 6]
cmpl %eax, (%rdi) # 8 *cmpsi_1/1 [length = 2]
setne %al # 23 *setcc_qi [length = 3]
movzbl %al, %eax # 24 *zero_extendqisi2_movzbl [length = 3]
ret # 27 return_internal [length = 1]
.cfi_endproc
.LFE0:
.size dl_main, .-dl_main
.ident "GCC: (GNU) 4.7.0 20110723 (experimental)"
.section .note.GNU-stack,"",@progbits
