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Vector Extensions to C (SSE2 on X86)
- From: Amund Fjellheim <abc at lavacat dot com>
- To: gcc at gcc dot gnu dot org
- Date: Tue, 1 Aug 2006 07:09:21 +0200
- Subject: Vector Extensions to C (SSE2 on X86)
GCC has some support for vector instructions through typedef'ed types
typedef int v4si __attribute__ ((vector_size (16)));
Some normal C operators can be done on these and there are some
platform specific built in functions. The X86 functions are listed at
Functions.html#X86-Built_002din-Functions , but there are lots of
SSE2 instructions missing. Why? I don't see how it could be so hard
v4si __builtin_ia32_pslld(v4si, int)
and so on, when so many other SSE and SSE2 instructions are there.
Also, why aren't they available for C++ programs compiled with g++?
Will these things be fixed in future releases of gcc? Anyone know
something about the status on this?