On Wed, Sep 23, 2009 at 11:26 AM, Mark Mentovai <m...@chromium.org> wrote:
> doing something wrong. Using SSE2 floating-point operations in a
> configuration that we test and then using x87 floating-point
> operations in a configuration that we release is completely bogus.
The reality of the situation:
* x87 doubles are 80-bits in registers and 64-bits in memory. This
means that changing the optimisation flags of the compiler (and thus
the spill profile of the code) changes rounding errors.
* So, using x87 means that we would need two sets of image baselines:
debug and release. It also means that different versions of GCC might
end up needing their own baselines.
* However, some people don't have SSE2 processors, so requiring it in
Chrome branded builds would exclude them.
I believe the current situation, impure as it is, is the best answer.
AGL
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