https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114228
Bug ID: 114228
Summary: memset/memcpy loop not always recognised with -Os
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: denis.campredon at gmail dot com
Target Milestone: ---
typedef __SIZE_TYPE__ size_t;
void baz(char *);
void foo( char *__restrict buff, const char*__restrict input)
{
size_t max = __builtin_strlen (input);
for(size_t i = 0 ; i < max; ++i)
buff[i] = 0;
baz(buff);
}
void bar( char *__restrict buff, const char*__restrict input)
{
size_t max = __builtin_strlen (input);
for(size_t i = 0 ; i < max; ++i)
buff[i] = input[i];
baz(buff);
}
--------------
The code above, compiled with -Os, the current trunk fails to convert the two
loops into memcpy/memset.
gcc 13.2 is able to convert the loops into a call.
