27 lines
708 B
Zig
27 lines
708 B
Zig
const math = @import("index.zig");
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const assert = @import("../debug.zig").assert;
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pub fn isNormal(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 + 0x00800000) & 0x7FFFFFFF >= 0x01000000
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},
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f64 => {
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const bits = @bitCast(u64, x);
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(bits + (1 << 52)) & (@maxValue(u64) >> 1) >= (1 << 53)
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},
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else => {
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@compileError("isNormal not implemented for " ++ @typeName(T));
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},
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}
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}
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test "math.isNormal" {
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assert(!isNormal(math.nan(f32)));
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assert(!isNormal(math.nan(f64)));
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assert(isNormal(f32(1.0)));
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assert(isNormal(f64(1.0)));
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}
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