value profiling transformation does not kick in for the following simple
program. Looks like it requires power of 2 values to dominate. It is probably
not due to design but simply lack of unit testing for feature.
#include <string.h>
void mycpy (char* s1, char *s2, int n) __attribute__((noinline));
void mycpy (char* s1, char *s2, int n)
{
memcpy(s1,s2,n);
}
int main()
{
char *s1 = malloc(100000);
char *s2 = malloc(100000);
int i;
for ( i = 0 ; i < 100000; i ++)
{
mycpy(s1,s2, 129);
}
}
--
Summary: Value profiling: string op -- requires power of 2
value??
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: xinliangli at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35590
