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add std.math f16 fabs support

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refs #1122
This commit is contained in:
Ben Noordhuis 2018-06-30 01:44:54 +02:00
parent f36b095b5f
commit 1abc925292
1 changed files with 19 additions and 0 deletions
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19
std/math/fabs.zig
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@ -10,12 +10,19 @@ const assert = std.debug.assert;
pub fn fabs(x: var) @typeOf(x) {
const T = @typeOf(x);
return switch (T) {
f16 => fabs16(x),
f32 => fabs32(x),
f64 => fabs64(x),
else => @compileError("fabs not implemented for " ++ @typeName(T)),
};
}
fn fabs16(x: f16) f16 {
var u = @bitCast(u16, x);
u &= 0x7FFF;
return @bitCast(f16, u);
}
fn fabs32(x: f32) f32 {
var u = @bitCast(u32, x);
u &= 0x7FFFFFFF;
@ -29,10 +36,16 @@ fn fabs64(x: f64) f64 {
}
test "math.fabs" {
assert(fabs(f16(1.0)) == fabs16(1.0));
assert(fabs(f32(1.0)) == fabs32(1.0));
assert(fabs(f64(1.0)) == fabs64(1.0));
}
test "math.fabs16" {
assert(fabs16(1.0) == 1.0);
assert(fabs16(-1.0) == 1.0);
}
test "math.fabs32" {
assert(fabs32(1.0) == 1.0);
assert(fabs32(-1.0) == 1.0);
@ -43,6 +56,12 @@ test "math.fabs64" {
assert(fabs64(-1.0) == 1.0);
}
test "math.fabs16.special" {
assert(math.isPositiveInf(fabs(math.inf(f16))));
assert(math.isPositiveInf(fabs(-math.inf(f16))));
assert(math.isNan(fabs(math.nan(f16))));
}
test "math.fabs32.special" {
assert(math.isPositiveInf(fabs(math.inf(f32))));
assert(math.isPositiveInf(fabs(-math.inf(f32))));