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LLVM 3.3 Picks Up More Support For Intel AVX2

Compiler

Published on 29 March 2013 03:25 PM EDT
Written by Michael Larabel in Compiler
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Beyond LLVM 3.3 having performance optimizations, one of many other features coming to this next compiler infrastructure update is greater support for Intel's AVX2 instruction set extensions.

AVX2 is the first major update to the Advanced Vector Extensions. AVX2 is also known as "Haswell New Instructions" and will be found in the Intel Haswell CPUs introduced in the coming months. AVX2 tacks in gather support, expands most integer AVX instructions to 256-bits, 3-operand FMA support, vector shifts, and other new functionality.

LLVM developers for a while have been working on Haswell/AVX2 support and there is some preliminary support to find in LLVM 3.2 (in fact, some early bits in LLVM 3.1) while the 3.3 release will provide more.

In recent days there has been some AVX2-related commits to the LLVM code-base. Some examples include RDSEED AVX2 and PREFETCHW code generation support.

There's also early AVX2/Haswell support within the recently released GCC 4.8 compiler.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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