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preproc: add a %selbits() function

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Although one can implement this "manually" in terms of %sel(), this
function is *really* useful for making multi-mode tests and allows for
better error checking.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin
2025-10-07 09:17:59 -07:00
parent e4044cfc48
commit f1b6d3188c
3 changed files with 73 additions and 23 deletions
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2
doc/changes.src
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@@ -31,6 +31,8 @@ It is the production version of NASM since 2025.
now be specified for the same group; the resulting group includes
all sections specified in all \c{GROUP} directives for the group.
\b A new \c{%selbits()} preprocessor function. See \k{f_selbits}.
\S{cl-3.00} Version 3.00

18
doc/preproc.src
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@@ -1011,6 +1011,24 @@ expands to nothing.
The arguments not selected are never expanded.
\S{f_selbits} \i\c{%selbits()} Function
The \c{%selbits()} function returns its first, second, or third
argument depending on if the current mode is 16, 32 or 64 bits. If
less than three arguments are given, the last argument is considered
repeated. Like \c{%cond()}, this is a specialized version of the
\c{%sel()} function.
For example:
\c BITS 64
\c
\c %define breg %selbits(bx,ebx,rbx)
\c %define vreg %selbits(ax,eax)
\c
\c mov vreg,[breg] ; mov eax,[rbx]
\S{f_str} \i\c\{%str()} Function
The \c{%str()} function converts its argument, including any commas,