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Implement ISCONST, reporting compile-time constness

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ISSOtm
2020-03-08 16:52:54 +01:00
parent 55b911654c
commit 8fcdcb1731
8 changed files with 64 additions and 1 deletions
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5
src/asm/rgbasm.5
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@@ -553,7 +553,7 @@ which references the same macro, which has the same problem.
.Pp
One of the best features of an assembler is the ability to write macros for it.
Macros also provide a method of passing arguments to them and they can then react to the input using
.Sy IF
.Ic IF
constructs.
.Pp
.Bd -literal -offset indent
@@ -1261,6 +1261,9 @@ For labels, as the linker has to resolve this, it can't be used when the express
has been defined.
.It Fn HIGH arg Ta Returns the top 8 bits of the operand if Ar arg No is a label or constant, or the top 8-bit register if it is a 16-bit register.
.It Fn LOW arg Ta Returns the bottom 8 bits of the operand if Ar arg No is a label or constant, or the bottom 8-bit register if it is a 16-bit register Pq Cm AF No isn't a valid register for this function .
.It Fn ISCONST arg Ta Returns 1 if Ar arg Ns No 's value is known by RGBASM (e.g. if it can be an argument to
.Ic IF ) ,
or 0 if only RGBLINK can compute its value.
.El
.Sh MISCELLANEOUS
.Ss Changing options while assembling