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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.
55 lines
1.5 KiB
Zig
55 lines
1.5 KiB
Zig
const std = @import("std");
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const math = std.math;
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pub fn __fminh(x: f16, y: f16) callconv(.C) f16 {
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return generic_fmin(f16, x, y);
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}
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pub fn fminf(x: f32, y: f32) callconv(.C) f32 {
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return generic_fmin(f32, x, y);
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}
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pub fn fmin(x: f64, y: f64) callconv(.C) f64 {
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return generic_fmin(f64, x, y);
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}
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pub fn __fminx(x: f80, y: f80) callconv(.C) f80 {
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return generic_fmin(f80, x, y);
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}
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pub fn fminq(x: f128, y: f128) callconv(.C) f128 {
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return generic_fmin(f128, x, y);
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}
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pub fn fminl(x: c_longdouble, y: c_longdouble) callconv(.C) c_longdouble {
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switch (@typeInfo(c_longdouble).Float.bits) {
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16 => return __fminh(x, y),
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32 => return fminf(x, y),
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64 => return fmin(x, y),
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80 => return __fminx(x, y),
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128 => return fminq(x, y),
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else => @compileError("unreachable"),
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}
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}
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inline fn generic_fmin(comptime T: type, x: T, y: T) T {
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if (math.isNan(x))
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return y;
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if (math.isNan(y))
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return x;
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return if (x < y) x else y;
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}
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test "generic_fmin" {
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inline for ([_]type{ f32, f64, c_longdouble, f80, f128 }) |T| {
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const nan_val = math.nan(T);
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try std.testing.expect(math.isNan(generic_fmin(T, nan_val, nan_val)));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, nan_val, 1.0));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, nan_val));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, 10.0));
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try std.testing.expectEqual(@as(T, -1.0), generic_fmin(T, 1.0, -1.0));
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}
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}
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