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cpubits: add 16 vs 32 and 32 vs 64-bit patterns #1442

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Merged
tarcieri merged 1 commit into from
Feb 2, 2026
Merged

cpubits: add 16 vs 32 and 32 vs 64-bit patterns #1442

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26 changes: 25 additions & 1 deletion cpubits/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -197,6 +197,30 @@ macro_rules! cpubits {
}
};

// Select between 16-bit and 32-bit options, where no code will be generated for 64-bit targets
(
16 => { $( $tokens16:tt )* }
32 => { $( $tokens32:tt )* }
) => {
$crate::cpubits! {
16 => { $( $tokens16 )* }
32 => { $( $tokens32 )* }
64 => { }
}
};

// Select between 32-bit and 64-bit options, where no code will be generated for 16-bit targets
(
32 => { $( $tokens32:tt )* }
64 => { $( $tokens64:tt )* }
) => {
$crate::cpubits! {
16 => { }
32 => { $( $tokens32 )* }
64 => { $( $tokens64 )* }
}
};

// Select between 16-bit and 32-bit options, where 64-bit will use the 32-bit option
(
16 => { $( $tokens16:tt )* }
Expand Down Expand Up @@ -253,7 +277,7 @@ macro_rules! cpubits {
@__items () ;
// The following are effectively `if`/`else` clauses in a Lispy syntax, where each
// 2-tuple is `( ( predicate ) ( body ) )`. The first clause with a matching predicate
// is taken and the rest are ignored just like `if`/`else`.
// is taken and its body executed and the rest are ignored just like `if`/`else`.
//
// We first match on each of the explicit overrides, and if none of them are configured
// apply our heuristic logic which allows certain targets to be overridden to use
Expand Down