From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Andreas Karlsson <andreas(at)proxel(dot)se> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: WIP: expression evaluation improvements |
Date: | 2019-10-24 22:53:59 |
Message-ID: | 20191024225359.h4n555huk6xpiikd@alap3.anarazel.de |
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Lists: | pgsql-hackers |
Hi,
On 2019-10-25 00:43:37 +0200, Andreas Karlsson wrote:
> On 10/23/19 6:38 PM, Andres Freund wrote:
> > In the attached *prototype* patch series there's a lot of incremental
> > improvements (and some cleanups) (in time, not importance order):
>
> You may already know this but your patch set seems to require clang 9.
I didn't, so thanks!
> I get the below compilation error which is probably cause by
> https://github.com/llvm/llvm-project/commit/90868bb0584f first being
> committed for clang 9 (I run "clang version 7.0.1-8
> (tags/RELEASE_701/final)").
>
> In file included from gistutil.c:24:
> ../../../../src/include/utils/float.h:103:7: error: invalid output
> constraint '=(at)ccae' in asm
> : "=(at)ccae"(ret), [clobber_reg]"=&x"(clobber_reg)
> ^
> 1 error generated.
I'll probably just drop this patch for now, it's not directly related. I
kind of wanted it on the list, so I have I place I can find it if I
forget :).
I think what really needs to happen instead is to improve the code
generated for __builtin_isinf[_sign]() by gcc/clang. They should proce
the constants like I did, instead of loading from the constant pool
every single time. That adds a fair bit of latency...
Greetings,
Andres Freund
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