33 lines
858 B
Zig
33 lines
858 B
Zig
const math = @import("index.zig");
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const assert = @import("../debug.zig").assert;
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pub fn isNan(x: var) -> bool {
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const T = @typeOf(x);
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switch (T) {
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f32 => {
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const bits = @bitCast(u32, x);
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bits & 0x7FFFFFFF > 0x7F800000
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},
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f64 => {
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const bits = @bitCast(u64, x);
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(bits & (@maxValue(u64) >> 1)) > (u64(0x7FF) << 52)
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},
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else => {
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@compileError("isNan not implemented for " ++ @typeName(T));
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},
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}
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}
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// Note: A signalling nan is identical to a standard right now by may have a different bit
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// representation in the future when required.
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pub fn isSignalNan(x: var) -> bool {
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isNan(x)
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}
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test "math.isNan" {
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assert(isNan(math.nan(f32)));
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assert(isNan(math.nan(f64)));
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assert(!isNan(f32(1.0)));
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assert(!isNan(f64(1.0)));
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}
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