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Re: [Lightning] sse instructions and gcc warnings
From: |
Paolo Bonzini |
Subject: |
Re: [Lightning] sse instructions and gcc warnings |
Date: |
Mon, 26 Jul 2010 09:13:58 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.10) Gecko/20100621 Fedora/3.0.5-1.fc13 Lightning/1.0b2pre Thunderbird/3.0.5 |
On 07/26/2010 08:45 AM, Paulo César Pereira de Andrade wrote:
Hi,
I did some more extra work in the lightning jit code generation
in my language
http://code.google.com/p/exl/source/browse/trunk/lib/elightning.c
It is still basically using lightning only to glue calls to C
functions, but I added some extra code for statically typed objects
yesterday and today...
But about @subject:
elightning.c:1664: warning: left-hand operand of comma expression has no
effect
elightning.c:1664: warning: value computed is not used
any code using the float registers shows those.
These are harmless and kind of inevitable.
There are some others
on x86_64 that cannot be masked, due to mixing int32 and void*.
Do you have a small testcase for this?
A strange one is:
elightning.c:1616: warning: implicit declaration of function ‘jit_replace’
elightning.c:1616: warning: nested extern declaration of ‘jit_replace’
that probably is harmless, as it links and works.
It links only because the particular combination involving jit_replace
was optimized out by the compiler. I committed a fix, too bad I don't
really have the time to write a test case too. :(
Also about @subject, I needed to add a global function to check
if a double is zero, because apparently the i387 goes nonsense if
a function using vector instructions was called.
Argument passing in i387 was buggy, it is kind of impossible to get it
right due to the stack-like registers. :(
I think I'm going to change it to use SSE always except for argument
passing. Would this be a problem?
Paolo
- [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/26
- Re: [Lightning] sse instructions and gcc warnings,
Paolo Bonzini <=
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/26
- Re: [Lightning] sse instructions and gcc warnings, Paolo Bonzini, 2010/07/26
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/26
- Re: [Lightning] sse instructions and gcc warnings, Paolo Bonzini, 2010/07/26
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/27
- Re: [Lightning] sse instructions and gcc warnings, Paolo Bonzini, 2010/07/28
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/28
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/28
- Re: [Lightning] sse instructions and gcc warnings, Paulo César Pereira de Andrade, 2010/07/30
- Re: [Lightning] sse instructions and gcc warnings, Paolo Bonzini, 2010/07/30