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Add float repr bit extraction functions

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This commit is contained in:
Marc Tiehuis 2018-06-21 17:13:53 +12:00 committed by Andrew Kelley
parent eb6a8e6a3b
commit f50c0c664f
1 changed files with 26 additions and 1 deletions
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27
std/math/index.zig
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@ -183,6 +183,32 @@ test "math" {
_ = @import("big/index.zig");
}
pub fn floatMantissaBits(comptime T: type) comptime_int {
assert(@typeId(T) == builtin.TypeId.Float);
return switch (T.bit_count) {
16 => 10,
32 => 23,
64 => 52,
80 => 64,
128 => 112,
else => @compileError("unknown floating point type " ++ @typeName(T)),
};
}
pub fn floatExponentBits(comptime T: type) comptime_int {
assert(@typeId(T) == builtin.TypeId.Float);
return switch (T.bit_count) {
16 => 5,
32 => 8,
64 => 11,
80 => 15,
128 => 15,
else => @compileError("unknown floating point type " ++ @typeName(T)),
};
}
pub fn min(x: var, y: var) @typeOf(x + y) {
return if (x < y) x else y;
}
@ -607,4 +633,3 @@ pub fn lossyCast(comptime T: type, value: var) T {
else => @compileError("bad type"),
}
}