From: Dibyendu Majumdar <mobile@majumdar.org.uk>
To: David Malcolm <dmalcolm@redhat.com>
Cc: jit@gcc.gnu.org
Subject: Re: [PATCH] PR jit/66812: Candidate fix for for the code generation issue, v1
Date: Thu, 01 Jan 2015 00:00:00 -0000 [thread overview]
Message-ID: <CACXZuxcatQ8ykxcVwN=K5ASKoqsZywadssDzkuK3rOC1myJ6xA@mail.gmail.com> (raw)
In-Reply-To: <CACXZuxdWi-ZfHwK4Pa-mdbuBiX9zpzpvVbPeFVH9qqF5+8eFGg@mail.gmail.com>
On 10 July 2015 at 08:38, Dibyendu Majumdar <mobile@majumdar.org.uk> wrote:
> On 10 July 2015 at 01:45, David Malcolm <dmalcolm@redhat.com> wrote:
>>> however performance degraded similar to when
>>> -fno-strict-aliasing is used.
>>
>> Bother. What kind of numbers are we talking about?
>>
>
> I will post some numbers tonight.
>
I will not compare performance with LLVM here as I have a workaround
for the code that causes segmentation fault in libgccjit - so the
benchmarks are probably impacted due to this. Here is a comparison of
the benchmarks with / without the fix.
1. fornum_test1.lua
without fix: 2e-6
with fix: 2.053
2. fornum_test2.ravi
without fix: 1.04
with fix: 3.14
3. mandel1.ravi
without fix: 3.52
with fix: 5.94
4. fannkuchen.ravi
without fix: 11.29
with fix: 16.98
5. matmul1.ravi 1000
without fix: 5.13
with fix: 11.28
> I am beginning to think that using unions was not a good idea - I
> should do it the way I implement the LLVM version - i.e. use a struct
> and emulate the union functionality. I think unions are just hard for
> the optimizer to reason about.
>
> Unfortunately this means a bit of rework - so I won't know if the
> struct approach is better until after I have done the changes and
> compared results.
>
next prev parent reply other threads:[~2015-07-10 10:12 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-01 0:00 A possible code generation issue Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Filed PR jit/66812 for the " David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` [PATCH] PR jit/66812: Candidate fix for for the code generation issue, v1 David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar [this message]
2015-01-01 0:00 ` Filed PR jit/66812 for the code generation issue Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` A possible " David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` PR jit/66783 (Re: A possible code generation issue) David Malcolm
2015-01-01 0:00 ` [PATCH, committed] PR jit/66783: prevent use of opaque structs David Malcolm
2015-01-01 0:00 ` Filed PR jit/66811: jit jumps aren't compilable as C (Re: A possible code generation issue) David Malcolm
2015-01-01 0:00 ` Filed PR jit/66811: jit dumps " David Malcolm
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