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34 lines
1.6 KiB
Markdown
34 lines
1.6 KiB
Markdown
---
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title: Power Vector Library
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tags:
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- software
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- vector
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- vsx
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- vmx
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- powervector
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- library
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date: 2022-01-08
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draft: false
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---
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The Power Vector Library are header files that contain useful functions leveraging the PowerISA Vector Facilities :
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Vector Multimedia Extension (VMX AKA Altivec) and Vector Scalar Extension (VSX). Larger functions like
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quadword multiply and multiple quadword multiply and madd are large enough to justify CPU specific and tuned run-time libraries.
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The user can choose to bind to platform specific static archives or dynamic shared object libraries which automatically
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(dynamic linking with IFUNC resolves) select the correct implementation for the CPU it is running on.
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The goal of this project to provide well crafted implementations of useful vector and large number operations :
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- Provide equivalent functions across versions of the PowerISA.
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For example the Vector Multiply-by-10 Unsigned Quadword operations introduced in PowerISA 3.0 (POWER9) can be
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implement in a few vector instructions on earlier PowerISA versions.
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- Provide equivalent functions across versions of the compiler.
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For example builtins provided in later versions of the compiler can be implemented as inline functions with inline asm in earlier compiler versions.
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- Provide higher order functions not provided directly by the PowerISA.
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For example vector SIMD implementation for ASCII ``__isalpha``, etc.
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Another example full ``__int128`` implementations of Count Leading Zeros, Population Count, and Multiply.
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- Provide optimized run-time libraries for quadword integer multiply and multi-quadword integer multiply and add.
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