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
50 lines
1.5 KiB
Zig
50 lines
1.5 KiB
Zig
//! parity - if number of bits set is even => 0, else => 1
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//! - pariytXi2_generic for big and little endian
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const std = @import("std");
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const builtin = @import("builtin");
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const common = @import("common.zig");
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pub const panic = common.panic;
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comptime {
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@export(__paritysi2, .{ .name = "__paritysi2", .linkage = common.linkage, .visibility = common.visibility });
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@export(__paritydi2, .{ .name = "__paritydi2", .linkage = common.linkage, .visibility = common.visibility });
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@export(__parityti2, .{ .name = "__parityti2", .linkage = common.linkage, .visibility = common.visibility });
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}
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pub fn __paritysi2(a: i32) callconv(.C) i32 {
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return parityXi2(i32, a);
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}
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pub fn __paritydi2(a: i64) callconv(.C) i32 {
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return parityXi2(i64, a);
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}
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pub fn __parityti2(a: i128) callconv(.C) i32 {
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return parityXi2(i128, a);
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}
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inline fn parityXi2(comptime T: type, a: T) i32 {
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var x = switch (@bitSizeOf(T)) {
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32 => @as(u32, @bitCast(a)),
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64 => @as(u64, @bitCast(a)),
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128 => @as(u128, @bitCast(a)),
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else => unreachable,
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};
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// Bit Twiddling Hacks: Compute parity in parallel
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comptime var shift: u8 = @bitSizeOf(T) / 2;
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inline while (shift > 2) {
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x ^= x >> shift;
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shift = shift >> 1;
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}
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x &= 0xf;
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return (@as(u16, @intCast(0x6996)) >> @as(u4, @intCast(x))) & 1; // optimization for >>2 and >>1
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}
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test {
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_ = @import("paritysi2_test.zig");
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_ = @import("paritydi2_test.zig");
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_ = @import("parityti2_test.zig");
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}
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