PSUBB
PSUBx: Subtract Packed Integers
PSUBB mm1,mm2/m64 ; 0F F8 /r [PENT,MMX]
PSUBW mm1,mm2/m64 ; 0F F9 /r [PENT,MMX]
PSUBD mm1,mm2/m64 ; 0F FA /r [PENT,MMX]
PSUBQ mm1,mm2/m64 ; 0F FB /r [WILLAMETTE,SSE2]
PSUBB xmm1,xmm2/m128 ; 66 0F F8 /r [WILLAMETTE,SSE2]
PSUBW xmm1,xmm2/m128 ; 66 0F F9 /r [WILLAMETTE,SSE2]
PSUBD xmm1,xmm2/m128 ; 66 0F FA /r [WILLAMETTE,SSE2]
PSUBQ xmm1,xmm2/m128 ; 66 0F FB /r [WILLAMETTE,SSE2]
PSUBx subtracts packed integers in the source operand from those in the destination operand. It doesn't differentiate between signed and unsigned integers, and doesn't set any of the flags.
PSUBB operates on byte sized elements.
PSUBW operates on word sized elements.
PSUBD operates on doubleword sized elements.
PSUBQ operates on quadword sized elements.