Enable SSE2 intrinsics code and Elbrus CPU support#2
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makise-homura wants to merge 2 commits intolscsoft:masterfrom
Open
Enable SSE2 intrinsics code and Elbrus CPU support#2makise-homura wants to merge 2 commits intolscsoft:masterfrom
makise-homura wants to merge 2 commits intolscsoft:masterfrom
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There are CPUs with vector extensions other than x86 and x86_64. A support for optimized calculations for them is based on compiler intrinsics. So, this support is added. Also, this support is explicitly forced for Elbrus (E2K) processors.
eah_HierarchSearchGCT_SSE2: Force SSE2 support, Implementation (intrinsics / x86_64 assembler) chosen automatically. eah_HierarchSearchGCT_SSE2_NOOPT: Force generic C code + ivdep for SSE2. eah_HierarchSearchGCT_SSE2_INTRIN: Force SSE2 code based on intrinsics.
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I can't make pull requests to main LIGO git (https://git.ligo.org/lscsoft/lalsuite), so I make a pull request here. It is surely pushable to the main repository though.
In GCT app, there is SSE code written in x86_64 assembler; but vector extensions are available on some other CPUs, like Elbrus-8S and Elbrus-8SV (https://en.wikipedia.org/wiki/Elbrus-8S). So I added an implementation based on compiler instrinsics (and some specific targets for eah_HierarchSearchGCT binary to make this implementation buildable without modifying the Makefile), to make E@H application be able to be built and run efficiently (I achiveved about 3 times performance increase) on platforms that do not support x86_64 assembler (especially Elbrus).