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Added math library WIP.
Added some other stuff.
This commit is contained in:
Anachronaut
2024-11-18 19:38:38 -05:00
committed by GitHub
parent fc2955cc21
commit bf7beec8ec
5 changed files with 150 additions and 3 deletions
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Programs/Libraries/math.asm
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; A library of math subroutines for SplitBit.
#Program
int16add:
; Add two two-byte unsigned integers.
; Operands are stored in a four-byte array in the following order:
; Operand A, high byte
; Operand A, low byte
; Operand B, high byte
; Operand B, low byte
; The result is stored by overwriting Operand A.
; This subroutine expects the Data Pointer to be set to the start of the array.
; After execution, this routine leaves the data pointer set to the high byte of the result.
; If the addtion results in a carry, the carry flag will be set.
CCF ; Clear the Carry Flag, just in case.
DPUP 0d03 ; Move to Operand B's low byte.
LDB ; Load it to B.
DPDN 0d02 ; Move to Operand A's low byte.
LDA ; Load it to A.
ADD ; Add them together.
STQ ; Store the result.
INCD ; Go to Operand B's high byte.
LDB ; Load it to B.
DPDN 0d02 ; Go to Operand A's high byte.
LDA ; Load it to A.
ADD ; Add them together.
STQ ; Store the result.
RET ; Return to the caller.
int16sub:
; Subtract two two-byte unsigned integers.
; Operands are stored in a four-byte array in the following order:
; Operand A, high byte
; Operand A, low byte
; Operand B, high byte
; Operand B, low byte
; Operand B is subtracted from Operand A and the result is stored by overwriting Operand A.
; This subroutine expects the Data Pointer to be set to the start of the array.
; After execution, this routine leaves the data pointer set to the high byte of the result.
; If the addtion results in a carry, the carry flag will be set.
CCF ; Clear the Carry Flag, just in case.
DPUP 0d03 ; Move to Operand B's low byte.
LDB ; Load it to B.
DPDN 0d02 ; Move to Operand A's low byte.
LDA ; Load it to A.
SUB ; Subtract B from A.
STQ ; Store the result.
INCD ; Go to Operand B's high byte.
LDB ; Load it to B.
DPDN 0d02 ; Go to Operand A's high byte.
LDA ; Load it to A.
SUB ; Subtract B from A.
STQ ; Store the result.
RET ; Return to the caller.
#Data
Int16operands:
0x00 ; Operand A high byte.
0x00 ; Operand A low byte.
0x00 ; Operand B high byte.
0x00 ; Operand B low byte.
Programs/Libraries/print.asm
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@@ -32,7 +32,7 @@ printString: ; Expects Data Pointer to be set to the beginning of
INCD ; Increment Data Pointer to the next character.
BRI printString ; Branch to the beginning of the loop.
printDone:
RET ; Return to the caller.
RET ; Return to the caller.
; Expects A to contain the value to be printed in decimal form.
printByteDecimal:
@@ -132,6 +132,8 @@ DecimalValue:
0x00 ; The tens place.
0x00 ; The hundreds place.
; For convenience, I'll pad this out so programs using this library store their data in a fresh page of memory.
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00