stxvp

Store VSX Vector Pair

stxvp XS, DQ(RA)

Stores a pair of VSX vector registers to memory.

Details

For stxvp, the effective address (EA) is the sum of the integer value in GPR[RA] or 0 if RA=0 and the value DQ||0b0000, sign-extended to 64 bits. The contents of VSR[XSp] concatenated with VSR[XSp+1] are stored into memory at address EA.

Pseudocode Operation

if MSR.VSX=0 then VSX_Unavailable()
EAbase ←(RA=0) ? 0 : GPR[RA]
EAdisp ←EXTS64(DQ || 0b0000)
EA ←EAbase + EAdisp
store_data.bit[128:255] ←VSR[32×SX+2×Sp+1]
MEM(EA,32) ←store_data

Programming Note

For best performance, EA should be word-aligned.

Example

stxvp vs1, 0(r4)

Encoding

Binary Layout
61
0
XS
10
RA
11
DQ
16
4
 
Format DQ-form
Opcode 0x18000001
Extension VSX
Registers Altered MSR

Operands

  • XS
    Source Even VSR
  • DQ
    Offset
  • RA
    Base
  • XSp
    VSX Vector Register Pair
  • disp
    Displacement Value