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; Zilog eZ80 ANSI C Compiler Release 3.4
; -optsize -nomodsect -peephole -globalopt -localcse
; -const=ROM
FILE "..\EXP.C"
.assume ADL=1
SEGMENT CODE
; 1 /************************************************************************/
; 2 /* */
; 3 /* Copyright (C) 2000-2008 Zilog, Inc. */
; 4 /* */
; 5 /************************************************************************/
; 6 /*
; 7 exp returns the exponential function of its
; 8 floating-point argument.
; 9
; 10 The coefficients are #1069 from Hart and Cheney. (22.35D)
; 11 */
; 12
; 13 #include <errno.h>
; 14 #include <math.h>
; 15
; 16 #define p0 0.20803843466947e7
; 17 #define p1 0.30286971697440e5
; 18 #define p2 0.60614853300611e2
; 19 #define q0 0.60027203602388e7
; 20 #define q1 0.32772515180829e6
; 21 #define q2 0.17492876890931e4
; 22 #define log2e 1.44269504088896
; 23 #define sqrt2 1.41421356237310
; 24 #define maxf 10000
; 25
; 26 double exp(double arg) {
_exp:
LD HL,-23
CALL __frameset
; 27 double fraction;
; 28 double temp1, temp2, xsq;
; 29 int ent;
; 30
; 31 if ( arg == 0.0 ){
LD HL,(IX+6)
LD E,(IX+9)
LD BC,0
XOR A,A
CALL __fcmp
JR NZ,L_2
; 32 return 1.0;
LD HL,8388608
LD E,63
JR L_6
; 33 }
L_2:
; 34 if ( arg < -maxf ){
LD HL,(IX+6)
LD E,(IX+9)
LD BC,1851392
LD A,198
CALL __fcmp
JP P,L_4
OR A,A
; 35 return 0.0;
SBC HL,HL
LD E,0
JR L_6
; 36 }
L_4:
; 37 if ( arg > maxf ){
LD HL,1851392
LD E,70
LD BC,(IX+6)
LD A,(IX+9)
CALL __fcmp
JP P,L_5
; 38 errno = ERANGE;
LD BC,5
LD (_errno),BC
; 39 return HUGE_VAL ;
LD HL,(__huge_val)
LD A,(__huge_val+3)
LD E,A
JR L_6
; 40 }
L_5:
; 41 arg *= log2e;
LD HL,12102203
LD E,63
LD BC,(IX+6)
LD A,(IX+9)
CALL __fmul
LD (IX+6),BC
LD (IX+9),A
; 42 ent = floor( arg );
LD C,(IX+9)
LD B,0
PUSH BC
LD BC,(IX+6)
PUSH BC
CALL _floor
POP BC
POP BC
LD A,E
LD BC,HL
CALL __ftol
LD (IX+-11),BC
; 43 fraction = arg - ent - 0.5;
CALL __itol
CALL __ltof
OR A,A
SBC HL,HL
LD E,63
CALL __fadd
LD E,A
LD HL,BC
LD BC,(IX+6)
LD A,(IX+9)
CALL __fsub
LD (IX+-8),BC
LD (IX+-5),A
; 44 xsq = fraction * fraction;
LD E,(IX+-5)
LD A,(IX+-5)
LD HL,BC
CALL __fmul
LD (IX+-4),BC
LD (IX+-1),A
; 45 temp1 = ((p2 * xsq + p1) * xsq + p0) * fraction;
LD HL,7501212
LD E,66
CALL __fmul
LD HL,15506930
LD E,70
CALL __fadd
LD HL,(IX+-4)
LD E,(IX+-1)
CALL __fmul
LD HL,16643075
LD E,73
CALL __fadd
LD HL,(IX+-8)
LD E,(IX+-5)
CALL __fmul
LD (IX+-15),BC
LD (IX+-12),A
; 46 temp2 = ((1.0 * xsq + q2) * xsq + q1) * xsq + q0;
LD BC,(IX+-4)
LD A,(IX+-1)
LD HL,14330165
LD E,68
CALL __fadd
LD HL,(IX+-4)
LD E,(IX+-1)
CALL __fmul
LD HL,10487205
LD E,72
CALL __fadd
LD HL,(IX+-4)
LD E,(IX+-1)
CALL __fmul
LD HL,12005441
LD E,74
CALL __fadd
LD (IX+-19),BC
LD (IX+-16),A
; 47 return ldexp( sqrt2 * (temp2+temp1) / (temp2-temp1), ent );
LD DE,(IX+-11)
PUSH DE
LD HL,(IX+-15)
LD E,(IX+-12)
LD A,(IX+-16)
CALL __fadd
LD HL,11863283
LD E,63
CALL __fmul
LD (IX+-22),BC
LD (IX+-23),A
LD A,(IX+-16)
LD BC,(IX+-19)
LD HL,(IX+-15)
LD E,(IX+-12)
CALL __fsub
LD E,A
LD HL,BC
LD BC,(IX+-22)
LD A,(IX+-23)
CALL __fdiv
LD DE,BC
LD C,A
LD B,0
PUSH BC
PUSH DE
CALL _ldexp
POP BC
POP BC
POP BC
; 48 }
L_6:
LD SP,IX
POP IX
RET
;**************************** _exp ***************************
;Name Addr/Register Size Type
;_ldexp IMPORT ----- function
;_floor IMPORT ----- function
;__huge_val IMPORT 4 variable
;_errno IMPORT 3 variable
;temp2 IX-19 4 variable
;temp1 IX-15 4 variable
;ent IX-11 3 variable
;fraction IX-8 4 variable
;xsq IX-4 4 variable
;arg IX+6 4 parameter
; Stack Frame Size: 35 (bytes)
; Spill Code: 0 (instruction)
XREF _floor:ROM
XREF _ldexp:ROM
XREF __huge_val:ROM
XREF _errno:ROM
XREF __fadd:ROM
XREF __fsub:ROM
XREF __fmul:ROM
XREF __fdiv:ROM
XREF __fcmp:ROM
XREF __ftol:ROM
XREF __ltof:ROM
XREF __itol:ROM
XREF __frameset:ROM
XDEF _exp
END
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