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; Zilog eZ80 ANSI C Compiler Release 3.4
; -optsize -nomodsect -peephole -globalopt -localcse
; -const=ROM
FILE "..\ASIN.C"
.assume ADL=1
SEGMENT CODE
; 1 /* Copyright (c) 2000-2008 Zilog, Inc. */
; 2
; 3 /**
; 4 * asin(arg) return the arcsin of arg.
; 5 * arctan is called after appropriate range reduction.
; 6 */
; 7
; 8 #include <errno.h>
; 9 #include <math.h>
; 10
; 11 #define pio2 1.57079632679490
; 12
; 13 double asin(double arg) {
_asin:
LD HL,-8
CALL __frameset
; 14
; 15 double sign, temp;
; 16
; 17 sign = 1.;
LD BC,8388608
LD (IX+-8),BC
LD A,63
LD (IX+-5),A
; 18 if(arg < 0) {
LD HL,(IX+6)
LD E,(IX+9)
LD BC,0
XOR A,A
CALL __fcmp
JP P,L_2
; 19 arg = -arg;
LD BC,(IX+6)
LD A,(IX+9)
CALL __fneg
LD (IX+6),BC
LD (IX+9),A
; 20 sign = -1.;
LD BC,8388608
LD (IX+-8),BC
LD A,191
LD (IX+-5),A
; 21 }
L_2:
; 22
; 23 if(arg > 1.) {
LD HL,8388608
LD E,63
LD BC,(IX+6)
LD A,(IX+9)
CALL __fcmp
JP P,L_3
; 24 errno = EDOM;
LD BC,4
LD (_errno),BC
OR A,A
; 25 return(0.);
SBC HL,HL
LD E,0
JR L_7
; 26 }
L_3:
; 27
; 28 temp = sqrt(1. - arg*arg);
LD HL,(IX+6)
LD E,(IX+9)
LD BC,(IX+6)
LD A,(IX+9)
CALL __fmul
LD E,A
LD HL,BC
LD BC,8388608
LD A,63
CALL __fsub
LD DE,BC
LD C,A
LD B,0
PUSH BC
PUSH DE
CALL _sqrt
POP BC
POP BC
LD (IX+-4),HL
LD (IX+-1),E
; 29 if(arg > 0.7) {
LD E,63
LD BC,(IX+6)
LD A,(IX+9)
LD HL,3355443
CALL __fcmp
JP P,L_5
; 30 temp = pio2 - atan(temp/arg);
LD HL,(IX+6)
LD E,(IX+9)
LD BC,(IX+-4)
LD A,(IX+-1)
CALL __fdiv
LD DE,BC
LD C,A
LD B,0
PUSH BC
PUSH DE
CALL _atan
POP BC
POP BC
LD BC,13176795
LD A,63
CALL __fsub
LD (IX+-4),BC
LD (IX+-1),A
; 31 } else {
JR L_6
L_5:
; 32 temp = atan(arg/temp);
LD HL,(IX+-4)
LD E,(IX+-1)
LD BC,(IX+6)
LD A,(IX+9)
CALL __fdiv
LD DE,BC
LD C,A
LD B,0
PUSH BC
PUSH DE
CALL _atan
POP BC
POP BC
LD (IX+-4),HL
LD (IX+-1),E
; 33 }
L_6:
; 34
; 35 return(sign*temp);
LD HL,(IX+-4)
LD E,(IX+-1)
LD BC,(IX+-8)
LD A,(IX+-5)
CALL __fmul
LD E,A
LD HL,BC
; 36 }
L_7:
LD SP,IX
POP IX
RET
;**************************** _asin ***************************
;Name Addr/Register Size Type
;_atan IMPORT ----- function
;_sqrt IMPORT ----- function
;_errno IMPORT 3 variable
;sign IX-8 4 variable
;temp IX-4 4 variable
;arg IX+6 4 parameter
; Stack Frame Size: 20 (bytes)
; Spill Code: 0 (instruction)
XREF _sqrt:ROM
XREF _atan:ROM
XREF _errno:ROM
XREF __fsub:ROM
XREF __fmul:ROM
XREF __fdiv:ROM
XREF __fneg:ROM
XREF __fcmp:ROM
XREF __frameset:ROM
XDEF _asin
END
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