266 lines
12 KiB
NASM
266 lines
12 KiB
NASM
;*****************************************************************************
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;*
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;* Open Watcom Project
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;*
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;* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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;*
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;* ========================================================================
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;*
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;* This file contains Original Code and/or Modifications of Original
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;* Code as defined in and that are subject to the Sybase Open Watcom
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;* Public License version 1.0 (the 'License'). You may not use this file
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;* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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;* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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;* provided with the Original Code and Modifications, and is also
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;* available at www.sybase.com/developer/opensource.
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;*
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;* The Original Code and all software distributed under the License are
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;* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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;* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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;* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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;* NON-INFRINGEMENT. Please see the License for the specific language
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;* governing rights and limitations under the License.
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;*
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;* ========================================================================
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;*
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;* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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;* DESCRIBE IT HERE!
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;*
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;*****************************************************************************
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include mdef.inc
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include struct.inc
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modstart i64tos
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;
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;
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; int _CmpBigInt( int sigdigits, int near *bigint )
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; EAX EDX
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;
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xdefp __CmpBigInt
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xdefp __Rnd2Int
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xdefp __Bin2String
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defpe __CmpBigInt
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push EDI ; save EDI
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push ECX ; save ECX
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call getpow10 ; get address of Power of 10 table
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inc EAX ; ++sigdigits
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lea EDI,[EDI+EAX*8] ; point to Pow10Table[sigdigits+1]
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mov ECX,[EDX] ; get 64-bit integer
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mov EDX,4[EDX] ; ...(high part)
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sub EAX,EAX ; set adjustment to 0
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_loop ; loop
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cmp EDX,cs:[EDI] ; - check against 10**k
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_if e ; - if high parts equal
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cmp ECX,cs:4[EDI] ; - - compare low part
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_endif ; - endif
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_quif b ; - quit if num < 10**k
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add EDI,8 ; - set pointer to 10**(k+1)
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inc EAX ; - increment adjustment word
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_endloop ; endloop
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sub EDI,8 ; point at 10**(k-1)
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_loop ; loop
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cmp EDX,cs:[EDI] ; - check against 10**k
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_if e ; - if high parts equal
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cmp ECX,cs:4[EDI] ; - - compare low part
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_endif ; - endif
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_quif nb ; - quit if num >= 10**(k-1)
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sub EDI,8 ; - set pointer to 10**(k-2)
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dec EAX ; - increment adjustment word
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_endloop ; endloop
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pop ECX ; restore ECX
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pop EDI ; restore EDI
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ret ; return to caller
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endproc __CmpBigInt
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;[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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;[]
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;[] Rnd2int rounds the real pointed to by EAX to a 64 bit integer.
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;[]
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;[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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; void _Rnd2Int( double near *realnum, int near *bigint )
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; EAX EDX
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;
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defpe __Rnd2Int
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push EBX ; save registers
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push ECX ; save ECX
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push EDX ; save EDX
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push EBP ; save EBP
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push ESI ; save ESI
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push EDX ; save address of bigint array
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mov EBP,EAX ; get address of realnum
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mov ECX,[EBP] ; load the number
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mov EBX,4[EBP] ; . . .
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mov EBP,EBX ; save high word
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and EBP,0FFF00000h ; isolate exponent in EBP
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xor EBX,EBP ; isolate mantissa in EDX
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xor EBX,00100000h ; turn on implied '1' bit in mantissa
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shr EBP,20 ; move exponent to bottom part of word
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sub EBP,0433h ; calculate difference from 2**53
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_if ne ; if not already the right size
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_if a ; - if too big
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_loop ; - - loop
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shl ECX,1 ; - - - shift real left by one
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rcl EBX,1 ; - - - . . .
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dec EBP ; - - - decrement count
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_until e ; - - until count = 0
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_else ; - else
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sub EAX,EAX ; - - clear remainder
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sub ESI,ESI ; - - clear remainder bit bucket
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_loop ; - - loop
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shr EBX,1 ; - - - shift real right by one
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rcr ECX,1 ; - - - . . .
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rcr EAX,1 ; - - - save remainder
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adc ESI,ESI ; - - - remember if any bits fell off end
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inc EBP ; - - - increment count
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_until e ; - - until e
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_guess rup ; - - do we have to round up?
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cmp EAX,80000000h;- - - compare remainder with .5000000
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_quif b,rup ; - - - kick out if less than .5
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_if e ; - - - magical stuff if looks like a .5
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or ESI,ESI ; - - - any bits dropped off the bottom
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_if e ; - - - if not
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test ECX,1 ; - - - - - is bottom digit even?
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_quif e,rup ; - - - - - kick out if it is
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_endif ; - - - - endif
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_endif ; - - - endif
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add ECX,01 ; - - - round up the number
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adc EBX,00 ; - - - . . .
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_endguess ; - - endguess
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_endif ; - endif
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_endif ; endif
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pop EBP ; get address of bigint array
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mov [EBP],ECX ; store 64-bit integer
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mov 4[EBP],EBX ; . . .
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pop ESI ; restore ESI
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pop EBP ; restore EBP
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pop EDX ; restore EDX
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pop ECX ; restore ECX
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pop EBX ; restore EBX
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ret ; return
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endproc __Rnd2Int
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;[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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;[]
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;[] Bin2string converts a binary integer into a string
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;[]
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;[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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; void _Bin2String(
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; int near *bigint, /* EAX */
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; char near *bufptr, /* EDX */
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; int sigdigits ) /* EBX */
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;
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defpe __Bin2String
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push EBP ; save EBP
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push EDI ; save EDI
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push ECX ; save ECX
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push EBX ; save EBX
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mov EBP,EAX ; get address of bigint array
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mov ECX,[EBP] ; get 64-bit integer
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mov EAX,4[EBP] ; . . .
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mov EBP,EDX ; get buffer pointer
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add EBP,EBX ; point to end of buffer
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mov byte ptr [EBP],0; put in null character
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;
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; input:
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; EAX:ECX - 64-bit integer
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; EBP - pointer to buffer for digits
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; EBX - digit count
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push EAX ; save high word of quotient
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_loop ; loop
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pop EAX ; - restore high word of quotient
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mov EDI,10000 ; - divisor is 10000
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sub EDX,EDX ; - zero high word
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or EAX,EAX ; - check high word
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jne div1 ; - do all divides
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or ECX,ECX ; - check low order word
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jne div2 ; - skip first divide
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push EAX ; - save high word of quotient
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jmp short div5 ; - result is 0
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div1: div EDI ; - divide EAX:ECX by 10000
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div2: xchg ECX,EAX ; - ...
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div EDI ; - ...
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; quotient is in ECX:EAX
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; remainder is in EDX
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xchg ECX,EAX ; - move quotient to EAX:ECX
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push EAX ; - save high word of quotient
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mov EAX,EDX ; - get remainder
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mov DL,100 ; - get divisor
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div DL ; - split remainder into 2 parts
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mov DL,AH ; - save low order part
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mov AH,0 ; - zero
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aam ; - split top part into 2 digits
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xchg EDX,EAX ; - DH, DL gets top 2 digits, AX gets low part
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mov AH,0 ; - zero
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aam ; - split low part into 2 digits
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div5: add AX,3030h ; - make ASCII digits
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add DX,3030h ; - ...
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sub EBP,4 ; - move back 4
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mov 3[EBP],AL ; - put low order digit in buffer
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dec EBX ; - decrement digit count
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_quif e ; - quit if done
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mov 2[EBP],AH ; - ...
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dec EBX ; - decrement digit count
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_quif e ; - quit if done
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mov 1[EBP],DL ; - ...
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dec EBX ; - decrement digit count
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_quif e ; - quit if done
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mov [EBP],DH ; - put high order digit in buffer
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dec EBX ; - decrement digit count
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_until e ; until done
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pop EAX ; remove high word of quotient
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pop EBX ; restore EBX
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pop ECX ; restore ECX
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pop EDI ; restore EDI
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pop EBP ; restore EBP
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ret ; return
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endproc __Bin2String
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;<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
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;<> <>
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;<> 64-bit integer powers of 10 table <>
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;<> <>
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;<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
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getpow10 proc near ; get address of powers of 10 table
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call pow10end ; call around the table
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pow10table: ; powers of 10 table
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dd 000000000h,000000000h ; 0
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dd 000000000h,000000001h ; 10**00
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dd 000000000h,00000000ah ; 10**01
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dd 000000000h,000000064h ; 10**02
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dd 000000000h,0000003e8h ; 10**03
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dd 000000000h,000002710h ; 10**04
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dd 000000000h,0000186a0h ; 10**05
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dd 000000000h,0000f4240h ; 10**06
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dd 000000000h,000989680h ; 10**07
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dd 000000000h,005f5e100h ; 10**08
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dd 000000000h,03b9aca00h ; 10**09
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dd 000000002h,0540be400h ; 10**10
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dd 000000017h,04876e800h ; 10**11
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dd 0000000e8h,0d4a51000h ; 10**12
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dd 000000918h,04e72a000h ; 10**13
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dd 000005af3h,0107a4000h ; 10**14
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dd 000038d7eh,0a4c68000h ; 10**15
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dd 0002386f2h,06fc10000h ; 10**16
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dd 001634578h,05d8a0000h ; 10**17
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dd 00de0b6b3h,0a7640000h ; 10**18
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dd 08ac72304h,089e80000h ; 10**19
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dd 0ffffffffh,0ffffffffh ; MAX
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pow10end proc near
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pop EDI ; get address of table
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ret ; return
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endproc pow10end
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endproc getpow10
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endmod
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end
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