Zig 0.17.0-dev (Split by item)

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asinBinary64Vec

asin.asinBinary64Vec

fn asinBinary64Vec(comptime vec_len: comptime_int, x: @Vector(vec_len, f64)) @TypeOf(x)

File

lib/std/math/asin.zig:484

Code

fn asinBinary64Vec(comptime vec_len: comptime_int, x: @Vector(vec_len, f64)) @TypeOf(x) {
    const pi_over_2: @Vector(vec_len, f64) = @splat(math.pi / 2.0);
    const zero: @Vector(vec_len, f64) = @splat(0.0);
    const half: @Vector(vec_len, f64) = @splat(0.5);
    const neg_two: @Vector(vec_len, f64) = @splat(-2.0);
    const c0: @Vector(vec_len, f64) = @splat(0x1.555555555554ep-3);
    const c1: @Vector(vec_len, f64) = @splat(0x1.3333333337233p-4);
    const c2: @Vector(vec_len, f64) = @splat(0x1.6db6db67f6d9fp-5);
    const c3: @Vector(vec_len, f64) = @splat(0x1.f1c71fbd29fbbp-6);
    const c4: @Vector(vec_len, f64) = @splat(0x1.6e8b264d467d6p-6);
    const c5: @Vector(vec_len, f64) = @splat(0x1.1c5997c357e9dp-6);
    const c6: @Vector(vec_len, f64) = @splat(0x1.c86a22cd9389dp-7);
    const c7: @Vector(vec_len, f64) = @splat(0x1.856073c22ebbep-7);
    const c8: @Vector(vec_len, f64) = @splat(0x1.fd1151acb6bedp-8);
    const c9: @Vector(vec_len, f64) = @splat(0x1.087182f799c1dp-6);
    const c10: @Vector(vec_len, f64) = @splat(-0x1.6602748120927p-7);
    const c11: @Vector(vec_len, f64) = @splat(0x1.cfa0dd1f9478p-6);

    const ax = @abs(x);
    const ax_lt_half = ax < half;
    const z2 = @select(f64, ax_lt_half, x * x, @mulAdd(@Vector(vec_len, f64), -half, ax, half));
    const z = @select(f64, ax_lt_half, ax, @sqrt(z2));
    const z3 = z2 * z;
    const z4 = z2 * z2;
    const z8 = z4 * z4;
    const p0_1 = @mulAdd(@Vector(vec_len, f64), z2, c1, c0);
    const p2_3 = @mulAdd(@Vector(vec_len, f64), z2, c3, c2);
    const p0_3 = @mulAdd(@Vector(vec_len, f64), z4, p2_3, p0_1);
    const p4_5 = @mulAdd(@Vector(vec_len, f64), z2, c5, c4);
    const p6_7 = @mulAdd(@Vector(vec_len, f64), z2, c7, c6);
    const p4_7 = @mulAdd(@Vector(vec_len, f64), z4, p6_7, p4_5);
    const p8_9 = @mulAdd(@Vector(vec_len, f64), z2, c9, c8);
    const p10_11 = @mulAdd(@Vector(vec_len, f64), z2, c11, c10);
    const p8_11 = @mulAdd(@Vector(vec_len, f64), z4, p10_11, p8_9);
    const p4_11 = @mulAdd(@Vector(vec_len, f64), z8, p8_11, p4_7);
    const p0_11 = @mulAdd(@Vector(vec_len, f64), z8, p4_11, p0_3);
    const p = @mulAdd(@Vector(vec_len, f64), z3, p0_11, z);
    const y = @select(f64, ax_lt_half, p, @mulAdd(@Vector(vec_len, f64), p, neg_two, pi_over_2));
    return @select(f64, x < zero, -y, y);
}