B-194
DSP96002 USER’S MANUAL
MOTOROLA
; Entry point: dp_scale: c(r0)
←
c(r0) * 2**r1
;
; Inputs: r0 contains the lowest address of a 4-word internal
; extended precision number
; r1 contains an integer number
;
; Outputs: r0 contains the lowest address of a 4-word internal
; extended precision number
;
; Alters: D0.L,D1.L
;
; NOTE: r1 contains an integer. (It does NOT point to an address.)
;
dp_scale move r1,d0.l ;put scale factor in data register
move x:(r0),d1.l ;get exponent
add d0,d1 #$3fffffff,d0.l ;scale the number
jvc scle ;scale if no overflow
move d0.l,x:(r0) ; if overflow,
move #$ffffffff,d0.l ; set the result
move d0.l,x:(r0+ms) ; to the maximum
move d0.l,x:(r0+ls) ; number achievable
rts
scle move d1.l,x:(r0) ;save scaled exponent
rts
page
;
; MOTOROLA DSP96002 DPLIB - VERSION 1.0
;
; DP_SQRT - Find the square root of a double precision number.
;
; Entry point: dp_sqrt: c(r0)
←
sqrt(c(r0))
;
; Inputs: r0 contains the lowest address of a 4-word internal
; extended precision number
;
; Outputs: r0 contains the lowest address of a 4-word internal
; extended precision number
;
; Alters: D0.L,D1.L,D2.L,D3.L,D4.L,D5.L,D6.L,D7.L
;
dp_sqrt move x:(r0+ms),d0.l ;get most significant
tst d0 x:(r0),d1.l ;check, get exponent
jne _ok ;not zero
tst d1 ;check ls
jne _ok ;not zero
rts ;if already 0, return
_ok
move x:(r0+sign),d0.l ;get sign
tst d0 ;check for negative
jne uflow ;return 0
move #bias,d2.l ;get bias
sub d2,d1 #1,d0.l ;unbias exponent
lsr d1 ;square root of exponent
Summary of Contents for DSP96002
Page 3: ...1 2 DSP96002 USER S MANUAL MOTOROLA ...
Page 38: ...MOTOROLA DSP96002 USER S MANUAL 3 15 Figure 3 4 Modulo Arithmetic Unit Block Diagram ...
Page 39: ...3 16 DSP96002 USER S MANUAL MOTOROLA ...
Page 53: ...4 14 DSP96002 USER S MANUAL MOTOROLA ...
Page 76: ...MOTOROLA DSP96002 USER S MANUAL 5 23 Figure 5 8 Address Modifier Summary ...
Page 86: ...6 10 DSP96002 USER S MANUAL MOTOROLA ...
Page 101: ...MOTOROLA DSP96002 USER S MANUAL 7 15 Figure 7 9 HI Block Diagram One Port ...
Page 140: ...7 54 DSP96002 USER S MANUAL MOTOROLA ...
Page 166: ...9 10 DSP96002 USER S MANUAL MOTOROLA ...
Page 181: ...MOTOROLA DSP96002 USER S MANUAL 10 15 Figure 10 8 Program Address Bus FIFO ...
Page 337: ...MOTOROLA DSP96002 USER S MANUAL A 149 ...
Page 404: ...A 216 DSP96002 USER S MANUAL MOTOROLA PC xxxx D ...
Page 460: ...A 272 DSP96002 USER S MANUAL MOTOROLA SIOP Not affected ...
Page 484: ...A 296 DSP96002 USER S MANUAL MOTOROLA SSH PC SSL SR SP 1 SP ...
Page 519: ...MOTOROLA DSP96002 USER S MANUAL A 331 ...
Page 718: ...MOTOROLA DSP96002 USER S MANUAL B 199 ...
Page 871: ... MOTOROLA INC 1994 MOTOROLA TECHNICAL DATA SEMICONDUCTOR M Addendum ...
Page 888: ...MOTOROLA INDEX 1 INDEX ...
Page 889: ......