operator % and / in SSE2

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Does sse2 use binary operators % and /?

How would i write:

C++

int x=k%p; // eg 9/4 is equal to 1 and not 2.25(modulus operator) 
int y=a/b; // eg 9/4 is equal to 2 and not 2.25 ?

Posted 23-Jul-10 5:19am

SMART LUBOBYA

Updated 23-Jul-10 5:47am

Sandeep Mewara

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Richard MacCutchan · Answer 1 · 2010-07-23T06:13:00

Solution 1

Probably best to consult the Intel reference[^].

Posted 23-Jul-10 6:13am

Richard MacCutchan

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Kythen 23-Jul-10 14:00pm

Your link is to the basic x86 integer division instruction, not an SIMD division instruction in MMX/SSE/etc. While I agree that it's best to consult the CPU reference docs, I'm not sure that pointing him to the basic x86 DIV instruction is nearly as helpful as pointing him to the SSE2 instruction set reference would be.

Kythen · Answer 2 · 2010-07-23T07:57:00

No, there are no explicit division or modulus instructions in SSE2. You only get multiplication and shift operations.

If you are dividing by a constant, you might be able to use "magic numbers" to multiply by the multiplicative inverse. If not, you can try Newton's method to find the multiplicative inverse.

These two links may be of some use:
http://www.gamedev.net/community/forums/topic.asp?topic_id=537139[^]
http://www.hackersdelight.org/divcMore.pdf[^]