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zig/std/math/isfinite.zig

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rename std lib files to new convention
2019-03-02 13:46:04 -08:00
const std = @import("../std.zig");
move std/debug.zig to a subdirectory self hosted compiler parser tests do some fuzz testing
2017-12-23 19:08:53 -08:00
const math = std.math;
std.debug.assert: remove special case for test builds 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
2019-02-08 15:18:47 -08:00
const expect = std.testing.expect;
remove @minValue,@maxValue; add std.math.minInt,maxInt closes #1466 closes #1476
2018-10-26 11:59:58 -07:00
const maxInt = std.math.maxInt;
Add math library 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.
2017-06-16 01:26:10 -07:00
std.math: Add documentation for all functions and algorithm sources
2019-04-30 23:15:57 -07:00
/// Returns whether x is a finite value.
syntax: functions require return type. remove `->` The purpose of this is: * Only one way to do things * Changing a function with void return type to return a possible error becomes a 1 character change, subtly encouraging people to use errors. See #632 Here are some imperfect sed commands for performing this update: remove arrow: ``` sed -i 's/\(\bfn\b.*\)-> /\1/g' $(find . -name "*.zig") ``` add void: ``` sed -i 's/\(\bfn\b.*\))\s*{/\1) void {/g' $(find ../ -name "*.zig") ``` Some cleanup may be necessary, but this should do the bulk of the work.
2018-01-25 01:10:11 -08:00
pub fn isFinite(x: var) bool {
Add math library 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.
2017-06-16 01:26:10 -07:00
const T = @typeOf(x);
switch (T) {
add std.math f16 isfinite support refs #1122
2018-06-29 16:44:54 -07:00
f16 => {
const bits = @bitCast(u16, x);
return bits & 0x7FFF < 0x7C00;
},
Add math library 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.
2017-06-16 01:26:10 -07:00
f32 => {
const bits = @bitCast(u32, x);
explicitly return from blocks instead of last statement being expression value closes #629
2017-12-21 21:50:30 -08:00
return bits & 0x7FFFFFFF < 0x7F800000;
Add math library 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.
2017-06-16 01:26:10 -07:00
},
f64 => {
const bits = @bitCast(u64, x);
remove @minValue,@maxValue; add std.math.minInt,maxInt closes #1466 closes #1476
2018-10-26 11:59:58 -07:00
return bits & (maxInt(u64) >> 1) < (0x7FF << 52);
Add math library 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.
2017-06-16 01:26:10 -07:00
},
else => {
@compileError("isFinite not implemented for " ++ @typeName(T));
},
}
}
workaround for llvm bug See #393 for details
2017-06-19 11:36:33 -07:00
test "math.isFinite" {
std.debug.assert: remove special case for test builds 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
2019-02-08 15:18:47 -08:00
expect(isFinite(f16(0.0)));
expect(isFinite(f16(-0.0)));
expect(isFinite(f32(0.0)));
expect(isFinite(f32(-0.0)));
expect(isFinite(f64(0.0)));
expect(isFinite(f64(-0.0)));
expect(!isFinite(math.inf(f16)));
expect(!isFinite(-math.inf(f16)));
expect(!isFinite(math.inf(f32)));
expect(!isFinite(-math.inf(f32)));
expect(!isFinite(math.inf(f64)));
expect(!isFinite(-math.inf(f64)));
Add math library 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.
2017-06-16 01:26:10 -07:00
}