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Fix Log2Int type construction

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The following case for example, would previously fail:

    const a = u24(1) << Log2Int(u24)(22);
This commit is contained in:
Marc Tiehuis 2018-06-06 22:41:55 +12:00
parent d3693dca73
commit 212449bc23
1 changed files with 8 additions and 1 deletions
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9
std/math/index.zig
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@ -306,7 +306,14 @@ test "math.rotl" {
}
pub fn Log2Int(comptime T: type) type {
return @IntType(false, log2(T.bit_count));
// comptime ceil log2
comptime var count: usize = 0;
comptime var s = T.bit_count - 1;
inline while (s != 0) : (s >>= 1) {
count += 1;
}
return @IntType(false, count);
}
test "math overflow functions" {