From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <128e54d0a8f8b7e6b1efd5e1aadab44d@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] gcc trouble
From: Peter Bosch <pb@research.bell-labs.com>
In-Reply-To: <1725.199.98.17.55.1069356471.squirrel@wish>
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Date: Thu, 20 Nov 2003 15:03:57 -0500
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>> 3. Teach 8l (and 8a) about the additional instructions that GCC can
>> produce (MMX, SSE etc.), or make GCC to not use them.
>>
>
> Adding the MMX/SSE instructions might not be a bad idea on its own, on the
> off chance that some multimedia code gets ported to plan 9. After this
> semester is done I'll try my hand at it.

I have a 8a and 8l with support for MMX -- believe it or not, I used it
to implement UMTS encryption.  I'll see if I can merge my version of
8a and 8l in the regular tree.

Here's a sample of the assembly:

	/* y0 */
	MOVQ	0(AX),MM0	/* MM0: x0 */
	MOVQ	8(AX),MM1	/* MM1: x1 */
	MOVQ	16(AX),MM2	/* MM2: x2 */
	MOVQ	40(AX),MM3	/* MM3: x5 */
	MOVQ	56(AX),MM4	/* MM4: x7 */
	MOVQ	64(AX),MM5	/* MM5: x8 */
	MOVQ	MM0,MM7	/* MM7: x0 */
	PAND	MM2,MM7	/* MM7: x0x2 */
	PXOR	24(AX),MM7
	MOVQ	MM2,MM6	/* MM6: x2 */
	PAND	MM3,MM6	/* MM6: x2x5 */
	PXOR	MM6,MM7
	MOVQ	MM3,MM6	/* MM6: x5 */
	PAND	48(AX),MM6	/* MM6: x5x6 */
	PXOR	MM6,MM7

peter.