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31 lines
825 B
Zig
31 lines
825 B
Zig
const math = @import("index.zig");
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const assert = @import("../debug.zig").assert;
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pub fn isFinite(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) < (0x7FF << 52)
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},
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else => {
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@compileError("isFinite not implemented for " ++ @typeName(T));
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},
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}
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}
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test "math.isFinite" {
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assert(isFinite(f32(0.0)));
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assert(isFinite(f32(-0.0)));
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assert(isFinite(f64(0.0)));
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assert(isFinite(f64(-0.0)));
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assert(!isFinite(math.inf(f32)));
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assert(!isFinite(-math.inf(f32)));
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assert(!isFinite(math.inf(f64)));
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assert(!isFinite(-math.inf(f64)));
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}
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