| From: | Ants Aasma <ants(dot)aasma(at)eesti(dot)ee> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Checksums by default? |
| Date: | 2017-02-24 20:14:36 |
| Message-ID: | CA+CSw_tbGrBtSQ7p-duwWB46FbCx+HuhSYUsbs_8EtAa+nAN9Q@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Feb 24, 2017 at 10:02 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Uh, as far as I know, the best you are going to get from llvm is
> standard assembly, while the SSE4.1 instructions use special assembly
> instructions, so they would be faster, and in a way they are a GPU built
> into CPUs.
Both LLVM and GCC are capable of compiling the code that we have to a
vectorized loop using SSE4.1 or AVX2 instructions given the proper
compilation flags. This is exactly what was giving the speedup in the
test I showed in my e-mail.
Regards,
Ants Aasma
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