x86 Opcode PSUBB

Opcode PSUBB

CPU: all which supported IA MMX:
Pentium (P55C only), Pentium (tm) Pro (P6) future models
Type of Instruction: User

Instruction: PSUBB dest,src

Description:

dest[7..0] <- dest[7..0] - src[7..0]
dest[15..8] <- dest[15..8] - src[15..8]
dest[23..16] <- dest[23..16] - src[23..16]
dest[31..24] <- dest[31..24] - src[31..24]
dest[39..32] <- dest[39..32] - src[39..32]
dest[47..40] <- dest[47..40] - src[47..40]
dest[55..48] <- dest[55..48] - src[55..48]
dest[63..56] <- dest[63..56] - src[63..56]

Note: This instruction subtract packed byte in MMXregister/memory from
packed byte in MMX register.

Flags affected: None

Exceptions:

RM PM VM SMM Description
#GP(0) If Illegal memory operand's EA in CS,DS,ES,FS,GS
#SS(0) If illegal memory operand's EA in SS
#PF(fcode) If page fault
#AC #AC If unaligned memory reference then alignment
check enabled and in ring 3.
#UD #UD #UD #UD If CR0.EM = 1
#NM #NM #NM #NM If CR0.TS = 1
#MF #MF #MF #MF If pending FPU Exception
#13 #13 If any part of the the operand lies outside of
the EA space from 0 to FFFFH
++++++++++++++++++++++++++++++++++++++
COP & Times:

PSUBB mm,mm/m64 0FH F8H PostByte

P55C: n/a
future P6: n/a