topic load/store intrinsics in MMX technology(__m64) in Intel® ISA Extensions

load/store intrinsics in MMX technology(__m64)

Smart_Lubobya — Sun, 12 Sep 2010 08:26:30 GMT

have been checking for the MMX technology load/ store intrinsic in the intel mannuals. i dont seem to see any, how is loading and /or store of arrays done in MMX Tech. of type __m64?

load/store intrinsics in MMX technology(__m64)

Brijender_B_Intel — Mon, 13 Sep 2010 01:09:08 GMT

Check MOVQ instruction. you can use it to read or write 64bit.

http://www.intel.com/Assets/PDF/manual/253666.pdf

load/store intrinsics in MMX technology(__m64)

Thomas_W_Intel — Mon, 13 Sep 2010 12:48:21 GMT

In C/C++, a normal assignment will do. However, I must admit that I don't see why you would like to use MMX these days.

load/store intrinsics in MMX technology(__m64)

Smart_Lubobya — Sun, 19 Sep 2010 05:11:57 GMT

I read the manual and thanks a lot. i however could not see the equivalent intrinsic for MOVQ in __m64 data type.

load/store intrinsics in MMX technology(__m64)

Thomas_W_Intel — Mon, 27 Sep 2010 11:47:36 GMT

There is no intrinsic as the compiler will generate movq automatically for you when loading from memory.

If you would like to combine shorter types, there are _mm_set_pi32, _mm_set_pi16, and so on.