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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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NUMBERS.SWG
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0049_Binary and Hexidecimal.pas
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Pascal/Delphi Source File
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1994-05-26
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2KB
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74 lines
{
I've seen requests for these two procedures several times, and finally got
around to writing them in ASM.
{ ------- CUT HERE ------- }
(* Hex converts a number (num) to Hexadecimal. *)
(* num is the number to convert *)
(* nib is the number of Hexadecimal digits to return *)
(* Example: Hex(31, 4) returns '001F' *)
Function Hex(num: Word; nib: Byte): String; Assembler;
ASM
PUSHF
LES DI, @Result
XOR CH, CH
MOV CL, nib
MOV ES:[DI], CL
JCXZ @@3
ADD DI, CX
MOV BX, num
STD
@@1: MOV AL, BL
AND AL, $0F
OR AL, $30
CMP AL, $3A
JB @@2
ADD AL, $07
@@2: STOSB
SHR BX, 1
SHR BX, 1
SHR BX, 1
SHR BX, 1
LOOP @@1
@@3: POPF
End;
(* Binary converts a number (num) to Binary. *)
(* num is the number to convert *)
(* bits is the number of Binary digits to return *)
(* Example: Binary(31, 16) returns '0000000000011111' *)
Function Binary(num: Word; bits: Byte): String; Assembler;
ASM
PUSHF
LES DI, @Result
XOR CH, CH
MOV CL, bits
MOV ES:[DI], CL
JCXZ @@3
ADD DI, CX
MOV BX, num
STD
@@1: MOV AL, BL
AND AL, $01
OR AL, $30
STOSB
SHR BX, 1
LOOP @@1
@@3: POPF
End;
{ ------- CUT HERE ------- }
These procedures are fully optomized to my knowledge and have been tested
against normal Pascal routines that perform the same functions. Test results
returned that Hex performed aprox. 2.14 times faster than it's Pascal
equivilent, and Binary performed aprox. 14 times faster than it's Pascal
equivilent.
Enjoy!
David