On 06/12/12 11:01, Herbert Valerio Riedel wrote:

Ben Lippmeier writes:

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On 06/12/2012, at 12:12 , Johan Tibell wrote:

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I'm currently trying to implement word2Double#. Other such primops support both x87 and sse floating point math. Do we still support x87 fp math? Which compiler flag enables it?

It's on by default unless you use the -sse2 flag. The x87 support is horribly slow though. I don't think anyone would notice if you deleted the x87 code and made SSE the default, especially now that we have the LLVM code generator. SSE has been the way to go for over 10 years now.

btw, iirc GHC uses SSE2 for x86-64 code generation by default, and that the -msse2 option has only an effect when generating x86(-32) code

Yes, because all x86_64 CPUs support SSE2. Chips older than P4 don't support it. I imagine there aren't too many of those around that people want to run GHC on, and as Ben says, there's always -fllvm. Cheers, Simon