22 lines
514 B
Zig
22 lines
514 B
Zig
const std = @import("std");
|
|
|
|
pub extern fn __negsf2(a: f32) f32 {
|
|
return negXf2(f32, a);
|
|
}
|
|
|
|
pub extern fn __negdf2(a: f64) f64 {
|
|
return negXf2(f64, a);
|
|
}
|
|
|
|
fn negXf2(comptime T: type, a: T) T {
|
|
const Z = @IntType(false, T.bit_count);
|
|
|
|
const typeWidth = T.bit_count;
|
|
const significandBits = std.math.floatMantissaBits(T);
|
|
const exponentBits = std.math.floatExponentBits(T);
|
|
|
|
const signBit = (Z(1) << (significandBits + exponentBits));
|
|
|
|
return @bitCast(T, @bitCast(Z, a) ^ signBit);
|
|
}
|