some work towards floating point division

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FeralChild64 committed 2020-02-26 18:26:36 +01:00
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// #LAYOUT# STD * #TAKE
// #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
// #LAYOUT# * BASIC_0 #TAKE
// #LAYOUT# * * #IGNORE
//
// Math package - divide FAC2 by FAC1, ignores sign
//
// Input:
// - .A - must load FAC1 exponent ($61) beforehand to set the zero flag
//
// Output:
// - leaves the quotient FAC1 and the remainder in FAC2
//
// See also:
// - [CM64] Computes Mapping the Commodore 64 - page 114
// - https://www.c64-wiki.com/wiki/Floating_point_arithmetic
// - https://codebase64.org/doku.php?id=base:kernal_floating_point_mathematics
//
// XXX provide implementation
div_FAC2_FAC1:
STUB_IMPLEMENTATION()
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This is an important floating point math routine, documented in many places.
Example code utilizing the routine:
- https://www.lemon64.com/forum/viewtopic.php?t=67576&sid=d41e77cdddd28d6f9c9d52ce5b4e8dc3