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Date: Mon, 19 Jan 2004 22:46:00 -0000
From: Steve Munroe <sjmunroe@us.ibm.com>
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Organization: IBM LTC
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To: libc-hacker@sources.redhat.com, Tom Gall <tom_gall@vnet.ibm.com>,
        Andreas Jaeger <aj@suse.de>
CC: Segher Boessenkoof <segher@kernel.crashing.org>,
        Hartmut Penner <hpenner@de.ibm.com>
Subject: [RFC] Vector extentions for vprintf/vscanf
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X-SW-Source: 2004-01/txt/msg00074.txt.bz2

A number of platforms support Vector (SIMD) extentions that support with 
types and builtins in gcc. This includes i386 MMX, 3Dnow!, SSE, SSE2, 
PowerPC 32 (and now PowerPC64) Altivec/VMX.

One useful extention to glibc would be adding vector formating to 
printf/scanf. This would add the type modifier prefix v to the type 
modifiers hh, h, l. For example to print a vector of 16 signed bytes 
"%vhhd", 8 signed shorts "%vhd", 4 signed ints "%vd", or 4 floats 
"%vhf". (note the form "%vf" is reserved for a vector of 2 doubles but 
most current Vector SIMD implimentations don't support double float).

We would be happy to provide the supporting patches and documentation if 
there is interrest.