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|
; Zilog eZ80 ANSI C Compiler Release 3.4
; -optsize -nomodsect -peephole -globalopt -localcse
; -const=ROM
FILE "..\TAN.C"
.assume ADL=1
SEGMENT CODE
; 1 /************************************************************************/
; 2 /* */
; 3 /* Copyright (C)1987-2008 by */
; 4 /* Zilog, Inc. */
; 5 /* */
; 6 /* San Jose, California */
; 7 /* */
; 8 /************************************************************************/
; 9 /*
; 10 floating point tangent
; 11
; 12 A series is used after range reduction.
; 13 Coefficients are #4285 from Hart & Cheney. (19.74D)
; 14 */
; 15
; 16 #include <errno.h>
; 17 #include <math.h>
; 18
; 19 #define invpi 1.27323954473516
; 20 #define p0 -0.130682026475483e+5
; 21 #define p1 0.105597090171495e+4
; 22 #define p2 -0.155068565348327e+2
; 23 #define p3 0.342255438724100e-1
; 24 #define p4 0.338663864267717e-4
; 25 #define q0 -0.166389523894712e+5
; 26 #define q1 0.476575136291648e+4
; 27 #define q2 -0.155503316403171e+3
; 28
; 29 double tan(double arg)
; 30 {
_tan:
LD HL,-26
CALL __frameset
; 31 double sign, temp, e, x, xsq;
; 32 int flag, i;
; 33
; 34 flag = 0;
LD BC,0
LD (IX+-19),BC
; 35 sign = 1.;
LD BC,8388608
LD (IX+-4),BC
LD A,63
LD (IX+-1),A
; 36 if(arg < 0.){
LD HL,(IX+6)
LD E,(IX+9)
LD BC,0
XOR A,A
CALL __fcmp
JP P,L_1
; 37 arg = -arg;
LD BC,(IX+6)
LD A,(IX+9)
CALL __fneg
LD (IX+6),BC
LD (IX+9),A
; 38 sign = -1.;
LD BC,8388608
LD (IX+-4),BC
LD A,191
LD (IX+-1),A
; 39 }
L_1:
; 40 arg = arg*invpi; /*overflow?*/
LD HL,10680707
LD E,63
LD BC,(IX+6)
LD A,(IX+9)
CALL __fmul
LD (IX+6),BC
LD (IX+9),A
; 41 x = modf(arg,(double *)&e);
PEA IX+-26
LD C,(IX+9)
LD B,0
PUSH BC
LD BC,(IX+6)
PUSH BC
CALL _modf
POP BC
POP BC
POP BC
LD (IX+-8),HL
LD (IX+-5),E
; 42 i = e;
LD BC,(IX+-26)
LD A,(IX+-23)
CALL __ftol
LD (IX+-22),BC
; 43 switch(i%4) {
LD BC,4
LD HL,(IX+-22)
CALL __irems
CALL __seqcase
L__1:
DW 4
DW 0
DB 0
DW24 L_6
DW24 L_2
DW24 L_3
DW24 L_4
DW24 L_6
; 44 case 1:
L_2:
; 45 x = 1. - x;
LD HL,(IX+-8)
LD E,(IX+-5)
LD BC,8388608
LD A,63
CALL __fsub
LD (IX+-8),BC
LD (IX+-5),A
; 46 flag = 1;
LD BC,1
LD (IX+-19),BC
; 47 break;
JR L_6
; 48
; 49 case 2:
L_3:
; 50 sign = - sign;
LD BC,(IX+-4)
LD A,(IX+-1)
CALL __fneg
LD (IX+-4),BC
LD (IX+-1),A
; 51 flag = 1;
LD BC,1
LD (IX+-19),BC
; 52 break;
JR L_6
; 53
; 54 case 3:
L_4:
; 55 x = 1. - x;
LD HL,(IX+-8)
LD E,(IX+-5)
LD BC,8388608
LD A,63
CALL __fsub
LD (IX+-8),BC
LD (IX+-5),A
; 56 sign = - sign;
LD BC,(IX+-4)
LD A,(IX+-1)
CALL __fneg
LD (IX+-4),BC
LD (IX+-1),A
; 57 break;
; 58
; 59 case 0:
; 60 break;
; 61 }
L_6:
; 62
; 63 xsq = x*x;
LD HL,(IX+-8)
LD E,(IX+-5)
LD BC,(IX+-8)
LD A,(IX+-5)
CALL __fmul
LD (IX+-12),BC
LD (IX+-9),A
; 64 temp = ((((p4*xsq+p3)*xsq+p2)*xsq+p1)*xsq+p0)*x;
LD HL,920513
LD E,56
CALL __fmul
LD HL,798741
LD E,61
CALL __fadd
LD HL,(IX+-12)
LD E,(IX+-9)
CALL __fmul
LD HL,7871510
LD E,193
CALL __fadd
LD HL,(IX+-12)
LD E,(IX+-9)
CALL __fmul
LD HL,8650514
LD E,68
CALL __fadd
LD HL,(IX+-12)
LD E,(IX+-9)
CALL __fmul
LD HL,4993232
LD E,198
CALL __fadd
LD HL,(IX+-8)
LD E,(IX+-5)
CALL __fmul
LD (IX+-16),BC
LD (IX+-13),A
; 65 temp = temp/(((1.0*xsq+q2)*xsq+q1)*xsq+q0);
LD BC,(IX+-12)
LD A,(IX+-9)
LD HL,1802457
LD E,195
CALL __fadd
LD HL,(IX+-12)
LD E,(IX+-9)
CALL __fmul
LD HL,9760259
LD E,69
CALL __fadd
LD HL,(IX+-12)
LD E,(IX+-9)
CALL __fmul
LD HL,8519144
LD E,198
CALL __fadd
LD E,A
LD HL,BC
LD BC,(IX+-16)
LD A,(IX+-13)
CALL __fdiv
LD (IX+-16),BC
LD (IX+-13),A
; 66
; 67 if(flag == 1) {
LD HL,(IX+-19)
OR A,A
LD BC,1
SBC HL,BC
JR NZ,L_12
; 68 if(temp == 0.) {
LD HL,(IX+-16)
LD E,(IX+-13)
LD BC,0
XOR A,A
CALL __fcmp
JR NZ,L_10
; 69 errno = ERANGE;
LD BC,5
LD (_errno),BC
; 70 if (sign>0)
LD BC,(IX+-4)
LD A,(IX+-1)
OR A,A
SBC HL,HL
LD E,0
CALL __fcmp
JP P,L_8
; 71 return(HUGE_VAL);
LD HL,(__huge_val)
LD A,(__huge_val+3)
LD E,A
JR L_13
L_8:
; 72 return(-HUGE_VAL);
LD BC,(__huge_val)
LD A,(__huge_val+3)
CALL __fneg
LD E,A
LD HL,BC
JR L_13
; 73 }
L_10:
; 74 temp = 1./temp;
LD HL,(IX+-16)
LD E,(IX+-13)
LD BC,8388608
LD A,63
CALL __fdiv
LD (IX+-16),BC
LD (IX+-13),A
; 75 }
L_12:
; 76 return(sign*temp);
LD HL,(IX+-16)
LD E,(IX+-13)
LD BC,(IX+-4)
LD A,(IX+-1)
CALL __fmul
LD E,A
LD HL,BC
; 77 }
L_13:
LD SP,IX
POP IX
RET
;**************************** _tan ***************************
;Name Addr/Register Size Type
;__huge_val IMPORT 4 variable
;_errno IMPORT 3 variable
;_modf IMPORT ----- function
;e IX-26 4 variable
;i IX-22 3 variable
;flag IX-19 3 variable
;temp IX-16 4 variable
;xsq IX-12 4 variable
;x IX-8 4 variable
;sign IX-4 4 variable
;arg IX+6 4 parameter
; Stack Frame Size: 38 (bytes)
; Spill Code: 0 (instruction)
XREF _modf:ROM
XREF __huge_val:ROM
XREF _errno:ROM
XREF __irems:ROM
XREF __fadd:ROM
XREF __fsub:ROM
XREF __fmul:ROM
XREF __fdiv:ROM
XREF __fneg:ROM
XREF __fcmp:ROM
XREF __ftol:ROM
XREF __frameset:ROM
XREF __seqcase:ROM
XDEF _tan
END
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