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std: better int log2 implementation for number literals

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This commit is contained in:
Andrew Kelley 2017-08-19 02:29:18 -04:00
parent cd2f65ff6a
commit eb26aeb1e5
1 changed files with 5 additions and 2 deletions
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7
std/math/log2.zig
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@ -26,8 +26,11 @@ fn log2_workaround(x: var) -> @typeOf(x) {
else => @compileError("log2 not implemented for " ++ @typeName(T)),
};
},
TypeId.IntLiteral => {
return @typeOf(1)(log2_int(u128, x))
TypeId.IntLiteral => comptime {
var result = 0;
var x_shifted = x;
while ({x_shifted >>= 1; x_shifted != 0}) : (result += 1) {}
return result;
},
TypeId.Int => {
return log2_int(T, x);