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Re: [PATCH] libgcc variant (was: [PATCH] Optionally emit SSE ABIlibm calls on x86)
On Mon, 11 Jul 2005, Richard Henderson wrote:
> On Mon, Jul 11, 2005 at 11:56:00AM -0700, Ian Lance Taylor wrote:
> > I think that if we do put libmsse in gcc, we should put it in a
> > framework which makes it straightforward to extend to other processors
> > and processor variants.
>
> Eh, maybe. Without seeing these hypothetical processor variants
> and the ABI issues that they present, it's hard to know how to
> properly generalize such a framework.
>
> My guess is that most other processor variants will be embedded,
> and take the normal course of simply changing the ABI to nicely
> accomodate their new feature. I suppose arm-linux might be an
> exception here, since in theory it supports at least 3 fp units.
>
> Finally, I expect the sse bits will eventually be written primarily
> in assembly, making the extension to other processors less useful.
Indeed. And I expect the sse bits to be 1-to-1 compatible with a
variant for x86_64 which will end up in glibc libm, so it's really
sad we have to duplicate that code outside of glibc.
Richard.