Texas Instruments TMS34010 Reference Guide

Runtime Environment - Register Conventions
5.2.3 Register Variables
The C compiler uses up to eight register variables within a function. The
compiler
allocates the first four variables from registers A9 through A12 in
ascending order; the other variables
are allocated from other available registers.
If more than eight register variables are declared, the excess are treated as
normal variables. A register variable can contain any integer type, a pointer to
any type, or a float (doubles or structures are not allowed); however, register
variables
of type short and char are treated as long integers.
Using register variables can greatly increase code efficiency for some state-
ments (in some cases, the code may
be twice as efficient). Since the compiler
does
not track operations involving register variables, you can manipulate
them
as desired (even with asm statements).
5-7

Texas Instruments TMS34010 Specifications

General

Manufacturer	Texas Instruments
Model	TMS34010
Data Bus Width	32-bit
Operating Voltage	5 V
Year Introduced	1986
Category	Graphics Processor Unit (GPU)
Clock Speed	40 MHz (Maximum)
Instruction Set	Custom
Graphics Capabilities	2D graphics
Package	PGA
Resolution Support	up to 1024x768
Architecture	32-bit RISC