------- Additional Comments From tbptbp at gmail dot com 2005-01-30 13:37
-------
But i had to rewrite the hit_t structure in a way more closer to what's found in
the original source to avoid the same useless cloning i noted earlier with gcc.
Something like:
union float4_t {
float f[4];
__m128 v;
operator const __m128() const { return v; }
operator __m128() { return v; }
};
union int4_t {
int i[4];
__m128i v;
operator const __m128i() const { return v; }
operator __m128i() { return v; }
};
struct hit_t {
float4_t t,u,v;
int4_t id;
};
to avoid this:
40125f: andnps %xmm4,%xmm0
401262: orps 0x40(%esp),%xmm0
401267: movaps %xmm0,0x40(%esp)
40126c: movaps %xmm0,0x10(%eax)
I really don't get why it's happening; and i'm pretty sure it wasn't there with
some previous version of gcc. I'd seriously need a clue.
That aside, ICC's ouput is much cleaner and despite the P4 way to compute
addresses, faster on my K8.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19680
