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Re: [PATCH, take 2]: Implement automatic MMX/x87 switching
- From: Richard Henderson <rth at redhat dot com>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Mon, 11 Jul 2005 09:28:55 -0700
- Subject: Re: [PATCH, take 2]: Implement automatic MMX/x87 switching
- References: <5787cf4705071107452c7b0309@mail.gmail.com>
On Mon, Jul 11, 2005 at 04:45:48PM +0200, Uros Bizjak wrote:
> If no %mm register is used to pass parameters, but a %mm register is
> used for return value, input mode is also forced to MODE_MMX. This is
> used to prevent excessive switching in for loops.
Whether or not it creates "excessive switching", it's wrong,
because it changes the ABI.
r~