* patched that caused regression PR opt/8634
@ 2002-12-23 18:06 Janis Johnson
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From: Janis Johnson @ 2002-12-23 18:06 UTC (permalink / raw)
To: gcc, jh
The regression reported in PR optimization/8634 showed up
starting with this patch (strange but true):
Fri Dec 21 23:30:14 CET 2001 Jan Hubicka <jh@suse.cz>
* i386.h (TARGET_CPU_DEFAULT_pentium_mmx): New.
(TARGET_CPU_DEFAULT_*): Renumber.
I used this test case that Wolfgang provided. It aborts
when the wrong code is generated for -O2 on i686-linux:
--------------
/* incorrect code for inlining of memcpy under -O2 */
#include <string.h>
#include <stdlib.h>
int
main ()
{
int i;
char buffer[8];
const char head[8] =
{ 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H' };
memcpy (buffer, head, 8);
for (i = 0; i < 8; i++)
if (head[i] != buffer[i])
abort ();
return 0;
}
--------------
I've added this information to the PR.
Janis
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2002-12-23 18:06 patched that caused regression PR opt/8634 Janis Johnson
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