Compile the following program with -O3 on FreeBSD or Linux, x86:
///////////////
#include <stdlib.h>
#include <string.h>
register long foo asm("esi");
register long bar asm("edi");
char * crash_me_baby(char *str) {
char *path = malloc(1024 + strlen(str));
return path;
}
///////////////
This results in an error like the following:
test.c:10: error: unable to find a register to spill in class 'DIREG'
test.c:10: error: this is the insn:
(insn:HI 16 83 17 2 (parallel [
(set (reg:SI 2 cx [66])
(unspec:SI [
(mem:BLK (reg/v/f:SI 63 [ suffix ]) [0 A8])
(reg:QI 0 ax [70])
(const_int 1 [0x1])
(reg:SI 2 cx [69])
] 20))
(use (reg:SI 19 dirflag))
(clobber (reg/f:SI 68 [ suffix ]))
(clobber (reg:CC 17 flags))
]) 530 {*strlenqi_1} (insn_list:REG_DEP_TRUE 6 (insn_list:REG_DEP_TRUE
12 (insn_list:REG_DEP_TRUE 14 (insn_list:REG_DEP_TRUE 15 (nil)))))
(expr_list:REG_DEAD (reg:SI 19 dirflag)
(expr_list:REG_DEAD (reg:SI 2 cx [69])
(expr_list:REG_DEAD (reg:QI 0 ax [70])
(expr_list:REG_UNUSED (reg:CC 17 flags)
(expr_list:REG_UNUSED (reg/f:SI 68 [ suffix ])
(expr_list:REG_EQUAL (unspec:SI [
(mem:BLK (reg/v/f:SI 63 [ suffix ]) [0 A8])
(reg:QI 0 ax [70])
(const_int 1 [0x1])
(reg:SI 2 cx [69])
] 20)
(nil))))))))
--
Summary: Internal compiler error with register global variables
Product: gcc
Version: 4.2.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: slava at factorcode dot org
GCC build triplet: i386-unknown-freebsd6.2
GCC host triplet: i386-unknown-freebsd6.2
GCC target triplet: i386-unknown-freebsd6.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33096
