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Added some clarification to what inline assembly format specifiers do and don't do.

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I just spent way too long debugging an error that happened because I assumed an integer passed to the inline assembler would be treated as one by the inline assembly, so this clarification should hopefully prevent any future cases of that.
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ToboterXP 2023-10-24 21:03:45 +02:00 committed by GitHub
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doc/cc65.sgml
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@ -1774,9 +1774,9 @@ as the arguments for replacing the format specifiers will be translated as
usual.
<itemize>
<item><tt/%b/ - Numerical 8-bit value
<item><tt/%w/ - Numerical 16-bit value
<item><tt/%l/ - Numerical 32-bit value
<item><tt/%b/ - Numerical 8-bit value ($xx)
<item><tt/%w/ - Numerical 16-bit value ($xxxx)
<item><tt/%l/ - Numerical 32-bit value ($xxxxxxxx)
<item><tt/%v/ - Assembler name of a global variable or function
<item><tt/%o/ - Stack offset of a local variable
<item><tt/%g/ - Assembler name of a C label
@ -1784,6 +1784,8 @@ usual.
<item><tt/%%/ - The % sign itself
</itemize><p>
Note: For a numerical value to be treated as an immediate value by the assembler, a # has to be added in front of the format specifier.
Using those format specifiers, you can access C <tt/#defines/, variables, or
similar stuff from the inline assembler. For example, to load the value of
a C <tt/#define/ into the Y index register, one would use