4c16f9a3c3
This covers the majority of the functions as covered by the C99 specification for a math library. Code is adapted primarily from musl libc, with the pow and standard trigonometric functions adapted from the Go stdlib. Changes: - Remove assert expose in index and import as needed. - Add float log function and merge with existing base 2 integer implementation. See https://github.com/tiehuis/zig-fmath. See #374.
39 lines
808 B
Zig
39 lines
808 B
Zig
const math = @import("index.zig");
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const assert = @import("../debug.zig").assert;
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pub fn fabs(x: var) -> @typeOf(x) {
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const T = @typeOf(x);
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switch (T) {
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f32 => @inlineCall(fabs32, x),
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f64 => @inlineCall(fabs64, x),
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else => @compileError("fabs not implemented for " ++ @typeName(T)),
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}
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}
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fn fabs32(x: f32) -> f32 {
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var u = @bitCast(u32, x);
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u &= 0x7FFFFFFF;
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@bitCast(f32, u)
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}
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fn fabs64(x: f64) -> f64 {
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var u = @bitCast(u64, x);
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u &= @maxValue(u64) >> 1;
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@bitCast(f64, u)
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}
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test "fabs" {
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assert(fabs(f32(1.0)) == fabs32(1.0));
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assert(fabs(f64(1.0)) == fabs64(1.0));
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}
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test "fabs32" {
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assert(fabs64(1.0) == 1.0);
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assert(fabs64(-1.0) == 1.0);
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}
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test "fabs64" {
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assert(fabs64(1.0) == 1.0);
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assert(fabs64(-1.0) == 1.0);
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}
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