vsubfp

Vector Subtract Floating-Point

vsubfp vD, vA, vB

Subtracts four single-precision floats (Classic VMX).

Encoding

Binary Layout

4

0:5

vD

6:10

vA

11:15

vB

16:20

74

21:31

 

Format VA-form

Opcode 0x1000004A

Extension VMX (AltiVec)

Operands

• vD
  Target
• vA
  Src A
• vB
  Src B

Example

vsubfp vd, va, vb

Registers Altered

MSR

Related

More in VMX (AltiVec)

Reference

View in PowerISA v3.1C Specification ↗ OPF Power ISA v3.1C

Description

Subtracts four single-precision floating-point elements in vB from the corresponding elements in vA, storing the IEEE 754 results in vD. No condition flags are set by this instruction. This is a Classic VMX (AltiVec) floating-point operation.

Operation

for i in 0 to 3 do
  vD[i] ← vA[i] - vB[i]  (IEEE 754 single precision)
endfor

Programming Note

The vsubfp instruction is used for vectorized subtraction of single-precision floating-point numbers. Ensure that the Vector Facility (MSR.VEC) is enabled before using this instruction; otherwise, a Vector_Unavailable exception will be raised. The operation processes four elements at a time, so ensure that the input vectors are properly aligned and contain valid floating-point data to avoid unexpected results.