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https://github.com/ziglang/zig.git
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cd019ee502
When exporting math functions for Windows, we provide weak exports of 'l' variants rather than weak aliases. We still use aliases on other operating systems so that the 'l' variants have one less jump instruction in this case.
41 lines
993 B
Zig
41 lines
993 B
Zig
const std = @import("std");
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pub fn __fabsh(a: f16) callconv(.C) f16 {
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return generic_fabs(a);
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}
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pub fn fabsf(a: f32) callconv(.C) f32 {
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return generic_fabs(a);
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}
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pub fn fabs(a: f64) callconv(.C) f64 {
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return generic_fabs(a);
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}
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pub fn __fabsx(a: f80) callconv(.C) f80 {
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return generic_fabs(a);
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}
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pub fn fabsq(a: f128) callconv(.C) f128 {
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return generic_fabs(a);
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}
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pub fn fabsl(x: c_longdouble) callconv(.C) c_longdouble {
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switch (@typeInfo(c_longdouble).Float.bits) {
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16 => return __fabsh(x),
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32 => return fabsf(x),
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64 => return fabs(x),
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80 => return __fabsx(x),
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128 => return fabsq(x),
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else => @compileError("unreachable"),
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}
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}
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inline fn generic_fabs(x: anytype) @TypeOf(x) {
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const T = @TypeOf(x);
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const TBits = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
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const float_bits = @bitCast(TBits, x);
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const remove_sign = ~@as(TBits, 0) >> 1;
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return @bitCast(T, float_bits & remove_sign);
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}
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