load.asm
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- ;
; Copyright 2003 by Texas Instruments Incorporated.
; All rights reserved. Property of Texas Instruments Incorporated.
; Restricted rights to use, duplicate or disclose this code are
; granted through contract.
;
;
; "@(#) DSP/BIOS 4.90.270 06-11-03 (barracuda-m10)"
;
- ; ======== load.asm ========
- ;
- ; C-callable interface to assembly language utility functions for the
- ; volume example.
- .global _load
- .text
- N .set 1000
- ;
- ; ======== _load ========
- ; This function simulates a load on the DSP by executing N * loopCount
- ; instructions, where loopCount is the input parameter to load().
- ;
- ; void _load(int loopCount)
- ;
- ; The loop is using 8 instructions. One instruction for sub, nop and
- ; b, plus nop 5. The extra nop added after sub is to make the number
- ; of instructions in the loop a power of 2.
- ;
- _load:
- mv a4, b0 ; use b0 as loop counter
- [!b0] b lend
- mvk N,b1
- mpy b1,b0,b0
- nop
- shru b0,3,b0 ; (loop counter)= (# loops)/8
- loop:
- sub b0,1,b0
- nop
- [b0] b loop
- nop 5
- lend: b b3
- nop 5 ; return
-
- .end