Assuming MIN < x < MAX:
| trick | operation/effect | note |
|---|---|---|
x & (x - 1) |
clear lowest 1 bit | if result 0, then x is 2 |
| `x | (x + 1)` | set lowest 0 bit |
| `x | (x - 1)` | set all bits to right of lowest 1 bit |
x & (x + 1) |
clear all bits to right of lowest 0 bit | |
x & -x |
extract lowest 1 bit | |
~x & (x + 1) |
extract lowest 0 bit (as 1 bit) |
| diff --git a/lib/std/fs.zig b/lib/std/fs.zig | |
| index 31354a278..f06db4943 100644 | |
| --- a/lib/std/fs.zig | |
| +++ b/lib/std/fs.zig | |
| @@ -2085,6 +2085,44 @@ pub const Dir = struct { | |
| } | |
| } | |
| + pub const CountStepsToFolderWithEntryError = error{ | |
| + InvalidKind, |
wasm2.c ──────►┌──────┐ ┌──────┐ ┌────┐ ┌──────┐ ┌────┐ ┌────┐ ┌────┐
│wasm2c│──►│zig1.c│──►│zig1│──►│zig2.c│──►│zig2│──►│zig3│──►│zig4│
┌───►└──────┘ ┌►└──────┘┌─►└────┘ └──────┘┌─►└────┘ └────┘ └────┘
│ zig1.wasm ─┘ │ │ ▲ ▲ ▲
CC ───────┴───────────────────────┴───────────────────┘ │ binary-identical
│
idealized, see TODO: │(optional)
used LLVM libs ─────────────────────►┌────┐ │
│LLVM│─────────────────┘
| /// Use this for additional posix spawn attributes. | |
| /// Do not set spawn attribute flags and do not modify stdin, stdout, stderr | |
| /// behavior, because those are set in the platform-specific spawn method. | |
| posix_attr: if (os.hasPosixSpawn) ?os.posix_spawn.Attr else void, | |
| posix_actions: if (os.hasPosixSpawn) ?os.posix_spawn.Actions else void, | |
| .posix_attr = if (os.hasPosixSpawn) null else undefined, | |
| .posix_actions = if (os.hasPosixSpawn) null else undefined, |
| #!/usr/bin/env sh | |
| #sript to download chunklist streams videos | |
| #ffmpeg -i "url_path_to_file.m3u8" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 file.mp4 | |
| ffmpeg -i "uri/chunklist_somehash.m3u8" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 file.mp4 |
| # powershell script to parse devkit version and install Zig | |
| # assume: 1. devkit in dir devkit, zig in dir zig in same dir | |
| # 2. powershell scripts executable (execution in shell): | |
| # Get-Content bZig.ps1 | PowerShell.exe -noprofile - | |
| # parse pip install | |
| $draftpathninja = pip show ninja | |
| $pathninja = $draftpathninja[7].Split(" ")[1] | |
| $joinpath = -join($pathninja, "\ninja\data\bin") | |
| $env:Path += $joinpath |
| $response = Invoke-RestMethod -Uri "https://ziglang.org/download/index.json" | |
| $downloadlink = $response.master.'x86_64-windows'.tarball | |
| Invoke-WebRequest -Uri "$downloadlink" -OutFile "$zigdl.zip" | |
| # TODO finish this up |
| # powershell script to parse devkit version and install Zig | |
| # assume: 1. devkit in dir devkit, zig in dir zig in same dir | |
| # 2. cmake installed (download possible on https://cmake.org/download/) | |
| # 3. ninja installed (pip install ninja) + in path | |
| # 4. powershell scripts executable (execution in shell): | |
| # Get-Content bZig.ps1 | PowerShell.exe -noprofile - | |
| ## current error: | |
| #[10/21] Linking CXX static library zigcpp\libzigcpp.a | |
| #FAILED: zigcpp/libzigcpp.a |
| #!/usr/bin/env sh | |
| set -e | |
| cd /mnt/c/Users/$USER/Desktop | |
| ## start get VERSION | |
| cd zig | |
| # alternative: curl https://github.com/ziglang/zig/blob/master/ci/x86_64-windows.ps1 | |
| raw_version=$(grep 'ZIG_LLVM_CLANG_LLD_NAME =' ci/x86_64-windows.ps1 | cut -f3-4 -d"-") | |
| len_version=$(echo -n $raw_version | wc -m) | |
| # cut " from string |
| #!/usr/bin/env sh | |
| set -e | |
| # git checkout release/15.x | |
| # LLVM | |
| cd llvm && mkdir -p build-deb15 && cd build-deb15 | |
| cmake .. -DLLVM_ENABLE_LIBEDIT=off -DCMAKE_INSTALL_PREFIX="${HOME}/local/llvm15deb" -DCMAKE_PREFIX_PATH="${HOME}/local/llvm15deb" -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_TERMINFO=OFF -G Ninja -DLLVM_PARALLEL_LINK_JOBS=1 | |
| ninja install | |
| cd ../.. |