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Re: g++ 3.4.0 cygwin, codegen SSE & alignement issues
- From: rridge at csclub dot uwaterloo dot ca (Ross Ridge)
- To: gcc at ompf dot org
- Cc: Ross Ridge <rridge at csclub dot uwaterloo dot ca>, cygwin at cygwin dot com
- Date: Thu, 29 Apr 2004 07:02:49 -0400 (EDT)
- Subject: Re: g++ 3.4.0 cygwin, codegen SSE & alignement issues
> SDL is a bit of a pain regarding cygwin (they insist on using mingw
> etc)...
Well, if SDL is using Win32 functions to create threads then that's
something that needs to be fixed in SDL.
> Under some circumstances some *ps instructions are generated touching
>non local memory (put in .rdata with 4 byte alignement as pointed out
>by Ross Ridge):
...
>40872a: xorps 0x43b33c,%xmm2
>40ab83: andps 0x43b8ec,%xmm0
...
>I guess i could try to track those constants and put them in their own
>section or something, but is there a proper fix in the work by someone
>knowledgeable?
Probably not, I don't think this bug has been reported yet. I modified
my copy of GCC to not put constants in .rdata, and put them in .text
like older versions of GCC used to do. That's not a good fix though.
A better fix would be to modify binutils to so that .rdata has a hardcoded
16-byte input section alignment, just like .text and .data have currently.
The proper fix would be for binutils to actually support section alignment
in PE COFF object files.
Ross Ridge
--
l/ // Ross Ridge -- The Great HTMU
[oo][oo] rridge@csclub.uwaterloo.ca
-()-/()/ http://www.csclub.uwaterloo.ca/u/rridge/
db //
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