36 lines
1.1 KiB
Zig
36 lines
1.1 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("std");
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pub fn __negsf2(a: f32) callconv(.C) f32 {
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return negXf2(f32, a);
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}
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pub fn __negdf2(a: f64) callconv(.C) f64 {
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return negXf2(f64, a);
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}
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pub fn __aeabi_fneg(arg: f32) callconv(.AAPCS) f32 {
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@setRuntimeSafety(false);
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return @call(.{ .modifier = .always_inline }, __negsf2, .{arg});
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}
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pub fn __aeabi_dneg(arg: f64) callconv(.AAPCS) f64 {
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@setRuntimeSafety(false);
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return @call(.{ .modifier = .always_inline }, __negdf2, .{arg});
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}
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fn negXf2(comptime T: type, a: T) T {
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const Z = std.meta.Int(false, @typeInfo(T).Float.bits);
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const significandBits = std.math.floatMantissaBits(T);
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const exponentBits = std.math.floatExponentBits(T);
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const signBit = (@as(Z, 1) << (significandBits + exponentBits));
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return @bitCast(T, @bitCast(Z, a) ^ signBit);
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}
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