vsubcuq

Vector Subtract Carryout Unsigned Quadword

vsubcuq vD, vA, vB

Subtracts the contents of two vector registers, adds one, and writes the carry-out to another register.

Details

For vsubcuq, the difference between the contents of VSR[VRA+32] and the one's complement of VSR[VRB+32], plus one, is placed into VSR[VRT+32]. The carry out is also written to VSR[VRT+32].

Pseudocode Operation

if MSR.VEC=0 then
    Vector_Unavailable()
src1 ←EXTZ(VSR[VRA+32])
src2 ←EXTZ(¬VSR[VRB+32])
VSR[VRT+32] ←CHOP128((src1 + src2 + 1) >> 128)

Programming Note

The Vector Subtract Unsigned Quadword instructions support efficient wide-integer subtraction.

Example

vsubcuq vd, va, vb

Encoding

Binary Layout
0
0
VRT
6
VRA
11
VRB
16
1344
21
 
Format VX-form
Opcode 0x10000500
Extension VMX (AltiVec)
Registers Altered MSR

Operands

  • vD
    Target
  • vA
    Src A
  • vB
    Src B
  • VRT
    Target Vector Register
  • VRA
    Source Vector Register
  • VRB
    Source Vector Register