On Tue, Oct 26, 2010 at 10:44 AM, André Pönitz <andre.poen...@nokia.com> wrote:
> For __m128 it's available in trunk now (change 26339061)
Many thanks.
> If you think other types are interesting, too, drop me a note
> with a list.
As a preamble, i don't think detecting/handling packed scalar types by
their colloquial name is the Right Thing because:
A) __m128, __m128i and __m128d already alias multiple underlying types.
B) with SSE4 and soon AVX, many more such vector types are natively
handled by the hardware (i mean with dedicated instructions).
C) gcc allows to construct arbitrary vector types, like
typedef unsigned char v1k __attribute((vector_size(1024)));
v1k x, y;
v1k z = x + y;
But the current fauna, as expressed by Intel's headers, is:
. 64bits: __m64 (MMX, SSE1+)
. 128bits: __m128, __m128d, __m128i (SSE2+)
. 256bits: __m256, __m256d, __m256i (AVX)
which each alias every other vector of same size built out of char,
short, int, long, long long, float, double (and every conceivable
signed and unsigned variants), plus a bitset of said size.
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