MMX Instructions

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#byte #fp

本文详细介绍了MMX指令集中的各类指令，包括算术运算、逻辑运算、位操作、数据转换等，并提供了每种指令的具体操作码及描述，有助于深入理解MMX技术的工作原理。

2000年12月20日 22:06:00

Arithmetic

Name	Regs	Opcode	Description
PADDB	register, memory/register	0F FC mod-rm	Add with wrap-around on byte
PADDW	register, memory/register	0F FD mod-rm	Add with wrap-around on word
PADDD	register, memory/register	0F FE mod-rm	Add with wrap-around on doubleword
PADDSB	register, memory/register	0F EC mod-rm	Add signed with saturation on byte
PADDSW	register, memory/register	0F ED mod-rm	Add signed with saturation on word
PADDUSB	register, memory/register	0F DC mod-rm	Add unsigned with saturation on byte
PADDUSW	register, memory/register	0F DD mod-rm	Add unsigned with saturation on word
PSUBB	register, memory/register	0F F8 mod-rm	Subtraction with wrap-around on byte
PSUBW	register, memory/register	0F F9 mod-rm	Subtraction with wrap-around on word
PSUBD	register, memory/register	0F FA mod-rm	Subtraction with wrap-around on doubleword
PSUBSB	register, memory/register	0F E8 mod-rm	Subtract signed with saturation on byte
PSUBSW	register, memory/register	0F E9 mod-rm	Subtract signed with saturation on word
PSUBUSB	register, memory/register	0F D8 mod-rm	Subtract unsigned with saturation on byte
PSUBUSW	register, memory/register	0F D9 mod-rm	Subtract unsigned with saturation on word
PMULHW	register, memory/register	0F E5 mod-rm	Packed multiply high on words
PMULLW	register, memory/register	0F D5 mod-rm	Packed multiply low on words
PMADDWD	register, memory/register	0F F5 mod-rm	Packed multiply on words and add resulting pairs

Comparison

Name	Regs	Opcode	Description
PCMPEQB	register, memory/register	0F 74 mod-rm,	Packed compare for equality byte
PCMPEQW	register, memory/register	0F 75 mod-rm	Packed compare for equality word
PCMPEQD	register, memory/register	0F 76 mod-rm	Packed compare for equality doubleword
PCMPGTB	register, memory/register	0F 64 mod-rm	Packed compare greater than byte
PCMPGTW	register, memory/register	0F 65 mod-rm	Packed compare greater than word
PCMPGTD	register, memory/register	0F 66 mod-rm	Packed compare greater than doubleword

Conversion

Name	Regs	Opcode	Description
PACKUSWB	register, memory/register	0F 67 mod-rm	Pack words into bytes (unsigned with saturation)
PACKSSWB	register, memory/register	0F 63 mod-rm	Pack words into bytes (signed with saturation)
PACKSSDW	register, memory/register	0F 6B mod-rm	Pack doublewords into words (signed with saturation)
PUNPCKHBW	register, memory/register	0F 68 mod-rm	Unpack (interleave) high-order bytes from MMX TM register
PUNPCKHWD	register, memory/register	0F 69 mod-rm	Unpack (interleave) high-order words from MMX TM register
PUNPCKHDQ	register, memory/register	0F 6A mod-rm	Unpack (interleave) high-order doublewords from MMX TM register
PUNPCKLBW	register, memory/register	0F 60 mod-rm	Unpack (interleave) low-order bytes from MMX register
PUNPCKLWD	register, memory/register	0F 61 mod-rm	Unpack (interleave) low-order words from MMX register
PUNPCKLDQ	register, memory/register	0F 62 mod-rm	Unpack (interleave) low-order doublewords from MMX register

Logical

Name	Regs	Opcode	Description
PAND	register, memory/register	0F DB mod-rm	Bitwise AND
PANDN	register, memory/register	0F DF mod-rm	Bitwise AND NOT
POR	register, memory/register	0F EB mod-rm	Bitwise OR
PXOR	register, memory/register	0F EF mod-rm	Bitwise XOR

Shift

Name	Regs	Opcode	Description
PSLLW	register, memory/register	0F F1 mod-rm	Packed shift left logical word by amount specified in MMX register or by immediate value
PSLLD	register, memory/register	0F F2 mod-rm, [sib]	Packed shift left logical doubleword by amount specified in MMX register or by immediate value
PSLLQ	register, memory/register	0F F3 mod-rm	Packed shift left logical quadword by amount specified in MMX register or by immediate value
PSRLW	register, memory/register	0F D1 mod-rm	Packed shift right logical word by amount specified in MMX register or by immediate value
PSRLD	register, memory/register	0F D2 mod-rm	Packed shift right logical doubleword by amount specified in MMX register or by immediate value
PSRLQ	register, memory/register	0F D3 mod-rm	Packed shift right logical quadword by amount specified in MMX register or by immediate value
PSRAW	register, memory/register	0F E1 mod-rm	Packed shift right arithmetic word by amount specified in MMX register or by immediate value
PSRAD	register, memory/register	0F E2 mod-rm	Packed shift right arithmetic doubleword by amount specified in MMX register or by immediate value
PSHIMW*	register, immediate	0F 71 mod-rm, imm
PSHIMD*	register, immediate	0F 72 mod-rm, imm
PSHIMQ*	register, immediate	0F 73 mod-rm, imm

Notes: * These are not the actual mnemonics: PSHIMD represents the PSLLD, PSRAD and PSRLD instructions when shifting by immediate shift counts. PSHIMW represents the PSLLW, PSRAW and PSRLW instructions when shifting by immediate shift counts. PSHIMQ represents the PSLLQ and PSRLQ instructions when shifting by immediate shift counts. The instructions that shift by immediate counts are differentiated by the ModR/M bytes.

Data Transfer

Name	Regs	Opcode	Description
MOVD	register, memory/iregister	0F 6E mod-rm	Move doubleword to MMX register or from MMX register
MOVD	memory/iregister, register	0F 7E mod-rm	Move doubleword to MMX register or from MMX register
MOVQ	register, memory/register	0F 6F mod-rm	Move quadword to MMX register or from MMX register
MOVQ	memory/register, register	0F 7F mod-rm	Move quadword to MMX register or from MMX register

FP & MMX State Mgmt

Name	Regs	Opcode	Description
EMMS		0F 77	Empty MMX state

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