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add std.math f16 nan support

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refs #1122
This commit is contained in:
Ben Noordhuis 2018-06-30 01:44:54 +02:00
parent 61df5bc142
commit 27b02413dc
5 changed files with 15 additions and 1 deletions
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3
std/math/index.zig
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@ -25,6 +25,9 @@ pub const f16_max = 65504;
pub const f16_epsilon = 0.0009765625; // 2**-10
pub const f16_toint = 1.0 / f16_epsilon;
pub const nan_u16 = u16(0x7C01);
pub const nan_f16 = @bitCast(f16, nan_u16);
pub const nan_u32 = u32(0x7F800001);
pub const nan_f32 = @bitCast(f32, nan_u32);

6
std/math/isnan.zig
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@ -5,6 +5,10 @@ const assert = std.debug.assert;
pub fn isNan(x: var) bool {
const T = @typeOf(x);
switch (T) {
f16 => {
const bits = @bitCast(u16, x);
return (bits & 0x7fff) > 0x7c00;
},
f32 => {
const bits = @bitCast(u32, x);
return bits & 0x7FFFFFFF > 0x7F800000;
@ -26,8 +30,10 @@ pub fn isSignalNan(x: var) bool {
}
test "math.isNan" {
assert(isNan(math.nan(f16)));
assert(isNan(math.nan(f32)));
assert(isNan(math.nan(f64)));
assert(!isNan(f16(1.0)));
assert(!isNan(f32(1.0)));
assert(!isNan(f64(1.0)));
}

2
std/math/nan.zig
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@ -2,6 +2,7 @@ const math = @import("index.zig");
pub fn nan(comptime T: type) T {
return switch (T) {
f16 => @bitCast(f16, math.nan_u16),
f32 => @bitCast(f32, math.nan_u32),
f64 => @bitCast(f64, math.nan_u64),
else => @compileError("nan not implemented for " ++ @typeName(T)),
@ -12,6 +13,7 @@ pub fn nan(comptime T: type) T {
// representation in the future when required.
pub fn snan(comptime T: type) T {
return switch (T) {
f16 => @bitCast(f16, math.nan_u16),
f32 => @bitCast(f32, math.nan_u32),
f64 => @bitCast(f64, math.nan_u64),
else => @compileError("snan not implemented for " ++ @typeName(T)),

4
std/special/builtin.zig
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@ -210,7 +210,9 @@ fn generic_fmod(comptime T: type, x: T, y: T) T {
}
fn isNan(comptime T: type, bits: T) bool {
if (T == u32) {
if (T == u16) {
return (bits & 0x7fff) > 0x7c00;
} else if (T == u32) {
return (bits & 0x7fffffff) > 0x7f800000;
} else if (T == u64) {
return (bits & (@maxValue(u64) >> 1)) > (u64(0x7ff) << 52);

1
std/special/compiler_rt/extendXfYf2_test.zig
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@ -88,6 +88,7 @@ test "extenddftf2" {
test "extendhfsf2" {
test__extendhfsf2(0x7e00, 0x7fc00000); // qNaN
test__extendhfsf2(0x7f00, 0x7fe00000); // sNaN
test__extendhfsf2(0x7c01, 0x7f802000); // sNaN
test__extendhfsf2(0, 0); // 0
test__extendhfsf2(0x8000, 0x80000000); // -0