84 lines
2.2 KiB
Zig
84 lines
2.2 KiB
Zig
const std = @import("../index.zig");
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const math = std.math;
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const assert = std.debug.assert;
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pub fn isInf(x: var) bool {
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const T = @typeOf(x);
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switch (T) {
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f32 => {
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const bits = @bitCast(u32, x);
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return bits & 0x7FFFFFFF == 0x7F800000;
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},
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f64 => {
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const bits = @bitCast(u64, x);
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return bits & (@maxValue(u64) >> 1) == (0x7FF << 52);
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},
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else => {
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@compileError("isInf not implemented for " ++ @typeName(T));
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},
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}
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}
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pub fn isPositiveInf(x: var) bool {
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const T = @typeOf(x);
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switch (T) {
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f32 => {
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return @bitCast(u32, x) == 0x7F800000;
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},
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f64 => {
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return @bitCast(u64, x) == 0x7FF << 52;
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},
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else => {
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@compileError("isPositiveInf not implemented for " ++ @typeName(T));
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},
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}
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}
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pub fn isNegativeInf(x: var) bool {
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const T = @typeOf(x);
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switch (T) {
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f32 => {
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return @bitCast(u32, x) == 0xFF800000;
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},
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f64 => {
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return @bitCast(u64, x) == 0xFFF << 52;
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},
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else => {
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@compileError("isNegativeInf not implemented for " ++ @typeName(T));
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},
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}
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}
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test "math.isInf" {
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assert(!isInf(f32(0.0)));
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assert(!isInf(f32(-0.0)));
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assert(!isInf(f64(0.0)));
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assert(!isInf(f64(-0.0)));
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assert(isInf(math.inf(f32)));
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assert(isInf(-math.inf(f32)));
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assert(isInf(math.inf(f64)));
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assert(isInf(-math.inf(f64)));
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}
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test "math.isPositiveInf" {
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assert(!isPositiveInf(f32(0.0)));
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assert(!isPositiveInf(f32(-0.0)));
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assert(!isPositiveInf(f64(0.0)));
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assert(!isPositiveInf(f64(-0.0)));
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assert(isPositiveInf(math.inf(f32)));
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assert(!isPositiveInf(-math.inf(f32)));
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assert(isPositiveInf(math.inf(f64)));
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assert(!isPositiveInf(-math.inf(f64)));
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}
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test "math.isNegativeInf" {
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assert(!isNegativeInf(f32(0.0)));
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assert(!isNegativeInf(f32(-0.0)));
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assert(!isNegativeInf(f64(0.0)));
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assert(!isNegativeInf(f64(-0.0)));
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assert(!isNegativeInf(math.inf(f32)));
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assert(isNegativeInf(-math.inf(f32)));
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assert(!isNegativeInf(math.inf(f64)));
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assert(isNegativeInf(-math.inf(f64)));
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}
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