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internal error on loop unrolling
- To: gcc-bugs at gcc dot gnu dot org
- Subject: internal error on loop unrolling
- From: FUKUCHI Kentarou <fukuchi at is dot titech dot ac dot jp>
- Date: Fri, 10 Dec 1999 23:10:11 +0900
GCC internal error occurs when compile the list below with optimizing
option '-funroll-loops'. Without '-funroll-loops', it goes well.
#include <stdio.h>
#include <stdlib.h>
int m[8],b[8];
int main(){
int i;
for(;;){
m[0] = rand();
if(m[0] == 0){
for(i=0;i<8;i++){
m[i] = b[i];
}
break;
}
}
}
elwood#22:31~/tmp$ gcc -v --save-temps -mpentium -O3 -fomit-frame-pointer -funroll-loops test.c
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.2/specs
gcc version 2.95.2 19991109 (Debian GNU/Linux)
/usr/lib/gcc-lib/i386-linux/2.95.2/cpp -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=95 -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__OPTIMIZE__ -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di586 -Dpentium -D__i586 -D__i586__ -D__pentium -D__pentium__ test.c test.i
GNU CPP version 2.95.2 19991109 (Debian GNU/Linux) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/gcc-lib/i386-linux/2.95.2/include
/usr/include
End of search list.
The following default directories have been omitted from the search path:
/usr/lib/gcc-lib/i386-linux/2.95.2/../../../../include/g++-3
/usr/lib/gcc-lib/i386-linux/2.95.2/../../../../i386-linux/include
End of omitted list.
/usr/lib/gcc-lib/i386-linux/2.95.2/cc1 test.i -mcpu=pentium -quiet -dumpbase test.c -mpentium -O3 -version -fomit-frame-pointer -funroll-loops -o test.s
GNU C version 2.95.2 19991109 (Debian GNU/Linux) (i386-linux) compiled by GNU C version 2.95.2 19991109 (Debian GNU/Linux).
test.c: In function `main':
test.c:17: Internal compiler error in `reg_in_basic_block_p', at loop.c:1313
Please submit a full bug report.
See <URL:http://www.gnu.org/software/gcc/faq.html#bugreport> for instructions.
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