4c16f9a3c3
This covers the majority of the functions as covered by the C99 specification for a math library. Code is adapted primarily from musl libc, with the pow and standard trigonometric functions adapted from the Go stdlib. Changes: - Remove assert expose in index and import as needed. - Add float log function and merge with existing base 2 integer implementation. See https://github.com/tiehuis/zig-fmath. See #374.
83 lines
2.1 KiB
Zig
83 lines
2.1 KiB
Zig
const math = @import("index.zig");
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const assert = @import("../debug.zig").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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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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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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@bitCast(u32, x) == 0x7F800000
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},
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f64 => {
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@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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@bitCast(u32, x) == 0xFF800000
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},
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f64 => {
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@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 "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 "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 "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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