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Re: MMX: Messy Multimedia eXtensions
- To: jimb at cygnus dot com (Jim Blandy)
- Subject: Re: MMX: Messy Multimedia eXtensions
- From: Todd Whitesel <toddpw at windriver dot com>
- Date: Wed, 10 Nov 1999 01:40:16 -0800 (PST)
- Cc: gdb at sourceware dot cygnus dot com (GDB Developers)
> - Assign them register numbers separate from the FP stack registers'.
> - Assign them the same numbers as the FP stack registers, and treat them as
> an alternative way of looking at the FP registers' mantissas.
Two quickies from the peanut gallery:
Mapping one register to two numbers is hazardous to any code that might
exist which saves/restores the register file by naively looping through
the register numbers.
Don't the Pentium 3 "SSE" extensions make FP+MMX registers become truly
distinct registers? I suppose you're taking it as a given that we already
know how to handle this case; just thought I should mention it anyway...
--
Todd Whitesel
toddpw @ windriver.com