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d29871977f
We already have a LICENSE file that covers the Zig Standard Library. We no longer need to remind everyone that the license is MIT in every single file. Previously this was introduced to clarify the situation for a fork of Zig that made Zig's LICENSE file harder to find, and replaced it with their own license that required annual payments to their company. However that fork now appears to be dead. So there is no need to reinforce the copyright notice in every single file.
28 lines
784 B
Zig
28 lines
784 B
Zig
const builtin = @import("builtin");
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const is_test = builtin.is_test;
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const std = @import("std");
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pub fn __floatunditf(a: u64) callconv(.C) f128 {
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@setRuntimeSafety(is_test);
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if (a == 0) {
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return 0;
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}
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const mantissa_bits = std.math.floatMantissaBits(f128);
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const exponent_bits = std.math.floatExponentBits(f128);
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const exponent_bias = (1 << (exponent_bits - 1)) - 1;
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const implicit_bit = 1 << mantissa_bits;
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const exp: u128 = (64 - 1) - @clz(u64, a);
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const shift: u7 = mantissa_bits - @intCast(u7, exp);
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var result: u128 = (@intCast(u128, a) << shift) ^ implicit_bit;
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result += (exp + exponent_bias) << mantissa_bits;
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return @bitCast(f128, result);
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}
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test "import floatunditf" {
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_ = @import("floatunditf_test.zig");
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}
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