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41dd2beaac
* unify the logic for exporting math functions from compiler-rt,
with the appropriate suffixes and prefixes.
- add all missing f128 and f80 exports. Functions with missing
implementations call other functions and have TODO comments.
- also add f16 functions
* move math functions from freestanding libc to compiler-rt (#7265)
* enable all the f128 and f80 code in the stage2 compiler and behavior
tests (#11161).
* update std lib to use builtins rather than `std.math`.
25 lines
626 B
Zig
25 lines
626 B
Zig
const std = @import("../../std.zig");
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const testing = std.testing;
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const math = std.math;
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const cmath = math.complex;
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const Complex = cmath.Complex;
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/// Returns the natural logarithm of z.
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pub fn log(z: anytype) Complex(@TypeOf(z.re)) {
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const T = @TypeOf(z.re);
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const r = cmath.abs(z);
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const phi = cmath.arg(z);
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return Complex(T).init(@log(r), phi);
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}
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const epsilon = 0.0001;
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test "complex.clog" {
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const a = Complex(f32).init(5, 3);
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const c = log(a);
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try testing.expect(math.approxEqAbs(f32, c.re, 1.763180, epsilon));
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try testing.expect(math.approxEqAbs(f32, c.im, 0.540419, epsilon));
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}
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