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PADDSIW mm,mm/m64 0F 51 /r Packed add signed words with saturation, using implied destination: imp <- saturate_s16(arg1+arg2)
PMAGW mm,mm/m64 0F 52 /r Packed signed word magnitude maximum value: if (abs(arg2) > abs(arg1)) then arg1 <- arg2
PDISTIB mm,m64 0F 54 /r Packed unsigned byte distance and accumulate to implied destination, with saturation: imp <- saturate_u8(imp + (abs(arg1-arg2)))
PSUBSIW mm,mm/m64 0F 55 /r Packed subtract signed words with saturation, using implied destination: imp <- saturate_s16(arg1-arg2)
PMULHRWC (PMULHRW) mm,mm/m64 0F 59 /r Packed signed word multiply high with rounding: arg1 <- (arg1*arg2+0x4000)>>15
PMULHRIW mm,mm/m64 0F 5D /r Packed signed word multiply high with rounding and implied destination: imp <- (arg1*arg2+0x4000)>>15
PMACHRIW mm,m64[b] 0F 5E /r Packed signed word multiply high with rounding and accumulation to implied destination: imp <- imp + ((arg1*arg2+0x4000)>>15)
PMVZB mm,m64 0F 58 /r if (imp == 0) then arg1 <- arg2 Packed conditional load from memory to MMX register. Condition is evaluated on a per-byte-lane basis, by comparing byte lanes in the implied source to zero (with signed compare) − if the comparison passes, then the corresponding destination lane is loaded from memory, otherwise it keeps its original value.
PMVNZB mm,m64 0F 5A /r if (imp != 0) then arg1 <- arg2
PMVLZB mm,m64 0F 5B /r if (imp < 0) then arg1 <- arg2
PMVGEZB mm,m64 0F 5C /r if (imp >= 0) then arg1 <- arg2
Opcodes overlap with SSE and other subsequent instructions.
The text was updated successfully, but these errors were encountered:
https://en.wikipedia.org/wiki/List_of_discontinued_x86_instructions#Cyrix_EMMI_instructions
Slightly relevant for DOS/Win9x/WinXP emulators as there is not a lot of software that uses those.
There is a CPU flag in Linux for those:
cxmmx
Cyrix MMX extensionsCyrix Extension to the Multimedia Instruction Set, Application Note 108 (some further docs and software are linked here)
Opcodes overlap with SSE and other subsequent instructions.
The text was updated successfully, but these errors were encountered: