mirror of
https://github.com/ziglang/zig.git
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f26dda2117
Most of this migration was performed automatically with `zig fmt`. There were a few exceptions which I had to manually fix: * `@alignCast` and `@addrSpaceCast` cannot be automatically rewritten * `@truncate`'s fixup is incorrect for vectors * Test cases are not formatted, and their error locations change
55 lines
1.8 KiB
Zig
55 lines
1.8 KiB
Zig
const std = @import("../std.zig");
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const math = std.math;
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const expect = std.testing.expect;
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/// Returns whether x is an infinity, ignoring sign.
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pub inline fn isInf(x: anytype) bool {
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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 remove_sign = ~@as(TBits, 0) >> 1;
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return @as(TBits, @bitCast(x)) & remove_sign == @as(TBits, @bitCast(math.inf(T)));
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}
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/// Returns whether x is an infinity with a positive sign.
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pub inline fn isPositiveInf(x: anytype) bool {
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return x == math.inf(@TypeOf(x));
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}
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/// Returns whether x is an infinity with a negative sign.
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pub inline fn isNegativeInf(x: anytype) bool {
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return x == -math.inf(@TypeOf(x));
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}
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test "math.isInf" {
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inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
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try expect(!isInf(@as(T, 0.0)));
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try expect(!isInf(@as(T, -0.0)));
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try expect(isInf(math.inf(T)));
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try expect(isInf(-math.inf(T)));
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try expect(!isInf(math.nan(T)));
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try expect(!isInf(-math.nan(T)));
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}
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}
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test "math.isPositiveInf" {
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inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
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try expect(!isPositiveInf(@as(T, 0.0)));
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try expect(!isPositiveInf(@as(T, -0.0)));
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try expect(isPositiveInf(math.inf(T)));
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try expect(!isPositiveInf(-math.inf(T)));
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try expect(!isInf(math.nan(T)));
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try expect(!isInf(-math.nan(T)));
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}
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}
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test "math.isNegativeInf" {
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inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
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try expect(!isNegativeInf(@as(T, 0.0)));
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try expect(!isNegativeInf(@as(T, -0.0)));
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try expect(!isNegativeInf(math.inf(T)));
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try expect(isNegativeInf(-math.inf(T)));
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try expect(!isInf(math.nan(T)));
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try expect(!isInf(-math.nan(T)));
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}
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}
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