?? rand_gen.asm
字號(hào):
;
; rand16_gen.asm - random number generator
; generates 16-bit wordlength zero-mean random numbers
;
; Prototype: int rand16_gen(int *)
;
; Entry: arg0 - AR0 pointer to seed value
; Return: T0 - random number
C1 .equ 0x6255
C2 .equ 0x3619
.def _rand16_gen
.sect "rand_gen"
_rand16_gen
mov #C1,T0
mpym *AR0,T0,AC0 ; seed=(C1*seed+C2)
add #C2,AC0
and #0xffff,AC0 ; seed%=0x8000
mov AC0,*AR0
sub #0x4000,AC0 ; Zero mean white noise
mov AC0,T0
ret
.end
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