32 lines
849 B
Zig
32 lines
849 B
Zig
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.IntType(false, T.bit_count);
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const typeWidth = T.bit_count;
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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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