mirror of
https://github.com/ziglang/zig.git
synced 2024-11-28 08:02:32 +00:00
ec95e00e28
stage2: change logic for detecting whether the main package is inside
the std package. Previously it relied on realpath() which is not portable.
This uses resolve() which is how imports already work.
* stage2: fix cleanup bug when creating Module
* flatten lib/std/special/* to lib/*
- this was motivated by making main_pkg_is_inside_std false for
compiler_rt & friends.
* rename "mini libc" to "universal libc"
78 lines
2.8 KiB
Zig
78 lines
2.8 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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// bswap - byteswap
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// - bswapXi2 for unoptimized big and little endian
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// ie for u32
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// DE AD BE EF <- little|big endian
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// FE BE AD DE <- big|little endian
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// ff 00 00 00 >> 3*8 (leftmost byte)
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// 00 ff 00 00 >> 1*8 (2nd left byte)
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// 00 00 ff 00 << 1*8 (2n right byte)
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// 00 00 00 ff << 3*8 (rightmost byte)
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inline fn bswapXi2(comptime T: type, a: T) T {
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@setRuntimeSafety(builtin.is_test);
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switch (@bitSizeOf(T)) {
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32 => {
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// zig fmt: off
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return (((a & 0xff000000) >> 24)
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| ((a & 0x00ff0000) >> 8 )
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| ((a & 0x0000ff00) << 8 )
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| ((a & 0x000000ff) << 24));
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// zig fmt: on
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},
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64 => {
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// zig fmt: off
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return (((a & 0xff00000000000000) >> 56)
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| ((a & 0x00ff000000000000) >> 40 )
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| ((a & 0x0000ff0000000000) >> 24 )
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| ((a & 0x000000ff00000000) >> 8 )
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| ((a & 0x00000000ff000000) << 8 )
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| ((a & 0x0000000000ff0000) << 24 )
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| ((a & 0x000000000000ff00) << 40 )
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| ((a & 0x00000000000000ff) << 56));
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// zig fmt: on
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},
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128 => {
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// zig fmt: off
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return (((a & 0xff000000000000000000000000000000) >> 120)
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| ((a & 0x00ff0000000000000000000000000000) >> 104)
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| ((a & 0x0000ff00000000000000000000000000) >> 88 )
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| ((a & 0x000000ff000000000000000000000000) >> 72 )
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| ((a & 0x00000000ff0000000000000000000000) >> 56 )
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| ((a & 0x0000000000ff00000000000000000000) >> 40 )
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| ((a & 0x000000000000ff000000000000000000) >> 24 )
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| ((a & 0x00000000000000ff0000000000000000) >> 8 )
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| ((a & 0x0000000000000000ff00000000000000) << 8 )
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| ((a & 0x000000000000000000ff000000000000) << 24 )
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| ((a & 0x00000000000000000000ff0000000000) << 40 )
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| ((a & 0x0000000000000000000000ff00000000) << 56 )
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| ((a & 0x000000000000000000000000ff000000) << 72 )
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| ((a & 0x00000000000000000000000000ff0000) << 88 )
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| ((a & 0x0000000000000000000000000000ff00) << 104)
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| ((a & 0x000000000000000000000000000000ff) << 120));
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// zig fmt: on
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},
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else => unreachable,
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}
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}
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pub fn __bswapsi2(a: u32) callconv(.C) u32 {
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return bswapXi2(u32, a);
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}
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pub fn __bswapdi2(a: u64) callconv(.C) u64 {
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return bswapXi2(u64, a);
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}
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pub fn __bswapti2(a: u128) callconv(.C) u128 {
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return bswapXi2(u128, a);
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}
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test {
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_ = @import("bswapsi2_test.zig");
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_ = @import("bswapdi2_test.zig");
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_ = @import("bswapti2_test.zig");
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}
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