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powiXf2

powiXf2.powiXf2

inline fn powiXf2(comptime FT: type, a: FT, b: i32) FT

File

lib/compiler_rt/powiXf2.zig:19

Code

inline fn powiXf2(comptime FT: type, a: FT, b: i32) FT {
    var x_a: FT = a;
    var x_b: i32 = b;
    const is_recip: bool = b < 0;
    var r: FT = 1.0;
    while (true) {
        if (@as(u32, @bitCast(x_b)) & @as(u32, 1) != 0) {
            r *= x_a;
        }
        x_b = @divTrunc(x_b, @as(i32, 2));
        if (x_b == 0) break;
        x_a *= x_a; // Multiplication of x_a propagates the error
    }
    return if (is_recip) 1 / r else r;
}