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zig/std/math/isnan.zig

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rename std lib files to new convention
2019-03-03 05:46:04 +08:00
const std = @import("../std.zig");
move std/debug.zig to a subdirectory self hosted compiler parser tests do some fuzz testing
2017-12-24 11:08:53 +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
2019-02-09 07:18:47 +08:00
const expect = std.testing.expect;
remove @minValue,@maxValue; add std.math.minInt,maxInt closes #1466 closes #1476
2018-10-27 02:59:58 +08:00
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 16:26:10 +08:00
std.math: Add documentation for all functions and algorithm sources
2019-05-01 14:15:57 +08:00
/// Returns whether x is a nan.
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 17:10:11 +08:00
pub fn isNan(x: var) bool {
Simplify math.isnan We can just rely on the builtin behavior.
2019-04-05 21:47:52 +08:00
return x != x;
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 16:26:10 +08:00
}
std.math: Add documentation for all functions and algorithm sources
2019-05-01 14:15:57 +08:00
/// Returns whether x is a signalling nan.
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 17:10:11 +08:00
pub fn isSignalNan(x: var) bool {
std.math: Add documentation for all functions and algorithm sources
2019-05-01 14:15:57 +08:00
// Note: A signalling nan is identical to a standard nan right now but may have a different bit
// representation in the future when required.
explicitly return from blocks instead of last statement being expression value closes #629
2017-12-22 13:50:30 +08:00
return isNan(x);
Add math special case tests and general fixes - Should cover special case inputs for most functions - Fixed a number of runtime panicking behaviour reliant on shift overflow/division by zero etc.
2017-06-20 19:01:04 +08:00
}
workaround for llvm bug See #393 for details
2017-06-20 02:36:33 +08:00
test "math.isNan" {
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
2019-02-09 07:18:47 +08:00
expect(isNan(math.nan(f16)));
expect(isNan(math.nan(f32)));
expect(isNan(math.nan(f64)));
Add f128 support for fabs, isinf, isnan, inf and nan functions
2019-02-13 18:27:23 +08:00
expect(isNan(math.nan(f128)));
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
2019-02-09 07:18:47 +08:00
expect(!isNan(f16(1.0)));
expect(!isNan(f32(1.0)));
expect(!isNan(f64(1.0)));
Add f128 support for fabs, isinf, isnan, inf and nan functions
2019-02-13 18:27:23 +08:00
expect(!isNan(f128(1.0)));
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 16:26:10 +08:00
}
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