VSX? Vmx? Altivec? VR? VSR ?! How are these PowerPC SIMD acronyms related to each other?

Question

I heard a lot about Altivec registers, but I didn't even find it on POWER9 ISA . In this document, I find only the VR and VSR registers in Chapter 6, Vector Object, and Chapter 7, Vector Scalar Floating Operations.

On ABI I noticed how registers are physically allocated:

and I still don’t understand why there are two groups. Legacy of Altivec?

As I understand it, the following happened:

• Altivec / VMX (Vector Multimedia eXtensions) is the old SIMD technology for PowerPc. I view it as an old Intel MMX.
• VSX ( eXtensions) - , Altivec, 32 (VSR32-VSR63), Altivec VSR0-VSR31. VSX 64 (VSR0-VSR63). Intel SSE.

?

Answer 1

:

• VMX - POWER/PowerPC.
• Altivec VMX; ,
• VSX - POWER.

VSX ( 32, 128 ) , VSX. , VSX- , VMX. VMX VSX , .

Intel, .