Following invalid C function gives internal compiler error on x86_64, but not on
x86, on GCC 3.4.3 and 3.3.5:
char blabla(unsigned int a)
{
return &((unsigned char *) &a)[0];
}
3.3.5 gives:
$ ./gcc -Wall -O2 -c /test/char.c
/test/char.c: In function `blabla':
/test/char.c:3: warning: return makes integer from pointer without a cast
/test/char.c:4: error: unrecognizable insn:
(insn 29 11 13 0 (nil) (set (reg:SI 0 eax [62])
(subreg:SI (plus:DI (subreg:DI (reg:QI 7 spl) 0)
(const_int -4 [0xfffffffffffffffc])) 0)) -1 (nil)
(nil))
/test/char.c:4: internal compiler error: in extract_insn, at recog.c:2175
$ ./gcc -v
Reading specs from /build/gcc/lib/gcc-lib/x86_64-unknown-linux-gnu/3.3.5/specs
Configured with: ./configure --enable-languages=c --prefix=/build/gcc
Thread model: posix
gcc version 3.3.5
3.4.3 gives:
$ ./gcc -Wall -O2 -c /test/char.c
/test/char.c: In function `blabla':
/test/char.c:3: warning: return makes integer from pointer without a cast
/test/char.c:4: error: unrecognizable insn:
(insn 30 11 13 0 (set (reg:SI 0 ax [62])
(subreg:SI (plus:DI (subreg:DI (reg:QI 7 sp) 0)
(const_int -4 [0xfffffffffffffffc])) 0)) -1 (nil)
(nil))
/test/char.c:4: internal compiler error: in extract_insn, at recog.c:2083
$ ./gcc -v
Reading specs from /build/gcc/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/specs
Configured with: ./configure --enable-languages=c --prefix=/build/gcc
Thread model: posix
gcc version 3.4.3
--
Summary: internal compiler error on errneous code
Product: gcc
Version: 3.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: heikki dot orsila at iki dot fi
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19743
