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improve name: abs -> abs-sign

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~d6 2023-12-29 16:35:39 -05:00
parent 1010f8c00c
commit e1714aceff
1 changed files with 2 additions and 2 deletions
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math-notes.txt
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@ -66,11 +66,11 @@ Other instructions will not handle "negative" integers correctly:
way to handle this is to make both values non-negative, do unsigned
division (i.e. DIV) and then set the correct sign at the end.
@abs ( x^ -- abs-x^ sign^ )
@abs-sign ( x^ -- abs-x^ sign^ )
DUP #7f GTH #fe MUL INC STHk MUL STHr JMP2r
@signed-div ( x^ y^ -- x/y^ )
abs STH SWP abs STH SWP DIV MULr STHr MUL JMP2r
abs-sign STH SWP abs-sign STH SWP DIV MULr STHr MUL JMP2r
Be careful! The smallest negative value (-128 for bytes, -32768 for shorts)
has no corresponding positive value. This means that some operations will