https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85697
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pinskia at gcc dot gnu.org
Component|target |tree-optimization
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Interesting:
```
struct alignas(16) A {
A (void) :a(0),b(0),c(0),d(0) {}
int a,b,c,d;
};
__attribute__((noinline, noipa)) void UseA (A& a) { a.a=1; }
int main (void)
{
char b[sizeof(A)] = {};
A a {};
__builtin_memcpy(&a, b, sizeof(a));
UseA (a);
return a.a;
}
```
Generates:
MEM <uint128_t> [(char * {ref-all})&a] = 0;
Store merging only goes up to:
/* The maximum size (in bits) of the stores this pass should generate. */
#define MAX_STORE_BITSIZE (BITS_PER_WORD)
#define MAX_STORE_BYTES (MAX_STORE_BITSIZE / BITS_PER_UNIT)
Blah.
