vcmpequq

Vector Compare Equal Quadword

vcmpequq VRT,VRA,VRB
vcmpequq. VRT,VRA,VRB

Compares two quadwords and sets the result to all ones if they are equal, otherwise all zeros.

Details

The vcmpequq instruction compares the contents of VSR[VRA+32] and VSR[VRB+32]. If they are equal, it sets VSR[VRT+32] to all ones; otherwise, it sets VSR[VRT+32] to all zeros.

Pseudocode Operation

if MSR.VEC=0 then
    Vector_Unavailable()

all_true ←1
all_false ←1

src1 ←VSR[VRA+32]
src2 ←VSR[VRB+32]

if src1 = src2 then do
   VSR[VRT+32] ←
      0xFFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF_FFFF
   all_false ←0
end
else do
   VSR[VRT+32] ←
      0x0000_0000_0000_0000_0000_0000_0000_0000
   all_true ←0
end

if Rc=1 then
   CR.field[6] ←all_true || 0b0 || all_false || 0b0

Programming Note

When Rc=1, CR1 is set from the FPSCR[FX, FEX, VX, OX] bits immediately after the operation completes.

Example

vcmpequq v1, v2, v3

Encoding

Binary Layout
0
0
VRT
6
VRA
11
VRB
16
Rc
21
 
Format VC-form
Opcode 0x100001C7
Extension VMX (AltiVec)
Registers Altered CR6

Operands

  • VRT
    Target Vector Register
  • VRA
    Source Vector Register
  • VRB
    Source Vector Register