c2db077574
Previously, std.debug.assert would `@panic` in test builds, if the assertion failed. Now, it's always `unreachable`. This makes release mode test builds more accurately test the actual code that will be run. However this requires tests to call `std.testing.expect` rather than `std.debug.assert` to make sure output is correct. Here is the explanation of when to use either one, copied from the assert doc comments: Inside a test block, it is best to use the `std.testing` module rather than assert, because assert may not detect a test failure in ReleaseFast and ReleaseSafe mode. Outside of a test block, assert is the correct function to use. closes #1304
77 lines
1.7 KiB
Zig
77 lines
1.7 KiB
Zig
// Special Cases:
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//
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// - fabs(+-inf) = +inf
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// - fabs(nan) = nan
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const std = @import("../index.zig");
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const math = std.math;
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const expect = std.testing.expect;
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const maxInt = std.math.maxInt;
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pub fn fabs(x: var) @typeOf(x) {
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const T = @typeOf(x);
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return switch (T) {
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f16 => fabs16(x),
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f32 => fabs32(x),
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f64 => 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 fabs16(x: f16) f16 {
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var u = @bitCast(u16, x);
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u &= 0x7FFF;
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return @bitCast(f16, u);
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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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return @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 &= maxInt(u64) >> 1;
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return @bitCast(f64, u);
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}
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test "math.fabs" {
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expect(fabs(f16(1.0)) == fabs16(1.0));
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expect(fabs(f32(1.0)) == fabs32(1.0));
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expect(fabs(f64(1.0)) == fabs64(1.0));
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}
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test "math.fabs16" {
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expect(fabs16(1.0) == 1.0);
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expect(fabs16(-1.0) == 1.0);
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}
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test "math.fabs32" {
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expect(fabs32(1.0) == 1.0);
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expect(fabs32(-1.0) == 1.0);
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}
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test "math.fabs64" {
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expect(fabs64(1.0) == 1.0);
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expect(fabs64(-1.0) == 1.0);
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}
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test "math.fabs16.special" {
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expect(math.isPositiveInf(fabs(math.inf(f16))));
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expect(math.isPositiveInf(fabs(-math.inf(f16))));
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expect(math.isNan(fabs(math.nan(f16))));
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}
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test "math.fabs32.special" {
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expect(math.isPositiveInf(fabs(math.inf(f32))));
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expect(math.isPositiveInf(fabs(-math.inf(f32))));
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expect(math.isNan(fabs(math.nan(f32))));
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}
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test "math.fabs64.special" {
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expect(math.isPositiveInf(fabs(math.inf(f64))));
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expect(math.isPositiveInf(fabs(-math.inf(f64))));
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expect(math.isNan(fabs(math.nan(f64))));
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}
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