vmaxfp

Vector Maximum Floating-Point

vmaxfp VRT,VRA,VRB

Performs element-wise maximum of two vector registers and stores the result in a third vector register.

Encoding

Binary Layout

4

0:5

VRT

6:10

VRA

11:15

VRB

16:31

 

Format VX-form

Opcode 0x1000040A

Extension VMX (AltiVec)

Operands

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

Example

vmaxfp v1, v2, v3

Related

More in VMX (AltiVec)

Reference

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

Description

For vmaxfp, for each integer value i from 0 to 3, the single-precision floating-point values in word elements i of VSR[VRA+32] and VSR[VRB+32] are compared. The larger of the two values is placed into word element i of VSR[VRT+32].

Operation

if MSR.VEC=0 then
    Vector_Unavailable()
do i = 0 to 3
    src1 ← VSR[VRA+32].word[i]
    src2 ← VSR[VRB+32].word[i]
    VSR[VRT+32].word[i] ← bfp32_MAXIMUM(src1,src2)
end

Programming Note

The vmaxfp instruction is used to perform element-wise maximum comparison of single-precision floating-point values in vector registers. Ensure that the Vector Facility (MSR.VEC) is enabled before using this instruction; otherwise, a Vector_Unavailable exception will be raised. This instruction operates on 4 elements per vector register and requires proper alignment of the input vectors for accurate results.