RE: [AD] Patch for performance issues in i386 blitters

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To: "'Eric Botcazou'" <ebotcazou@xxxxxxxxxx>, Allegro conductors <conductors@xxxxxxxxxx>
Subject: RE: [AD] Patch for performance issues in i386 blitters
From: "Vincent Penquerc'h" <Vincent.Penquerch@xxxxxxxxxx>
Date: Tue, 9 Jul 2002 10:45:41 +0100
Invalid-uucp-from: From Vincent.Penquerch@xxxxxxxxxx Tue Jul 9 20:10:41 2002

Title: RE: [AD] Patch for performance issues in i386 blitters

> - movw BMP_SEG(%edx), %es /* select segment */
> + movl BMP_SEG(%edx), %es /* select segment */
>
> doesn't actually save any byte, because GAS is smart enough
> to automatically
> convert the former into the latter.

I'm actually surprised it assembled at all, as es is 16 bits.
I'd have called that a bug in the source. Provided it does
what I think it does: mov es, word|dword ptr [edx]

--
Vincent Penquerc'h

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