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Multiplication instruction

Prashanthns
Beginner
‎12-20-2010 02:27 AM
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Is there any instruction to do signed dword integer multiplication using sse3 ??
I found muldq which is available only in sse4 !!!

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ILevi1
Valued Contributor I
‎12-22-2010 04:17 AM
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If I remember correctly there is no such instruction in SSE3 -- full support for SIMD 32-bit integer multiplication was added in SSE4.1 with PMULDQ and PMULLD.

You can use PMULUDQ (_mm_mul_epu32() intrinsic) from SSE2 though, people have been using that to multiply signed integers as well.

Take a look at this thread:
http://software.intel.com/en-us/forums/showthread.php?t=75969

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