MMX: Difference between revisions

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Revision as of 19:21, 28 February 2012 (view source) osdev>Bellezzasolo (Added: Detection, Use Today and some See Also) ← Older edit		Latest revision as of 06:39, 12 July 2021 (view source) osdev>Moldu (Added more details)
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Line 1: ~~==MMX==~~ {{Floats}} {{stub}} =Overview= ~~===Introduction===~~ MMX is a SIMD technology (single instruction, multiple data) introduced by Intel on January 8, 1997 with ~~ther~~their P5 "Pentium" processor line named "Pentium with MMX Technology". It has been superseded by [[SSE]] and now [[AVX]]. ===Detection===▼ ==Technical Details== ~~To detect MMX~~ ~~<source lang="asm">~~ MMX is accessed using 8 CPU registers (MM0 to MM7). Each register is 64 bits wide and can be used to hold 64-bit integers or multiple smaller integers packed. One instruction can be applied to two 32-bit integers, four 16-bit integers, or 8 8-bit integers at once. ~~;Check CPUID.01h EDX.MMX (EDX.23)~~ ~~mov eax, 0x1 ;0x.. is not needed, but standardizes~~ ▲===Detection=== ~~cpuid~~ ~~test edx, 1<<23 ;EDX.MMX~~ The bit for MMX can be found on CPUID page 1, in EDX bit 23. ~~jnz .MMX ;If no jump MMX is not present~~ ~~</source>~~ =MMX in 2021= ~~===Use today===~~ MMX is now an old technology that was left in the past in favour of the new technologies [[SSE]] and [[AVX]]. ~~It is unlikely that you will come across any MMX code today, as it has been superceded by [[SSE]], and compilers compile SSE code. However, it may be wowrthwile to be aware of MMX.~~ ~~==See Also==~~ ~~===SSE===~~ [[SSE]] ~~===X87===~~ [[FPU]]