b19b1c1298
```zig
export fn entry() void {
var c: i32 = 1234;
var x = switch (c) {
1 => u8(1),
2...4 => u16(2),
else => u32(3),
};
}
```
```llvm
define void @entry() #2 !dbg !35 {
Entry:
%c = alloca i32, align 4
%x = alloca i32, align 4
store i32 1234, i32* %c, align 4, !dbg !44
call void @llvm.dbg.declare(metadata i32* %c, metadata !39, metadata !DIExpression()), !dbg !44
%0 = load i32, i32* %c, align 4, !dbg !45
%1 = icmp sge i32 %0, 2, !dbg !46
%2 = icmp sle i32 %0, 4, !dbg !46
%3 = and i1 %1, %2, !dbg !46
br i1 %3, label %SwitchRangeYes, label %SwitchRangeNo, !dbg !46
SwitchRangeYes: ; preds = %Entry
br label %SwitchEnd, !dbg !45
SwitchElse: ; preds = %SwitchRangeNo
br label %SwitchEnd, !dbg !45
SwitchProng: ; preds = %SwitchRangeNo
br label %SwitchEnd, !dbg !45
SwitchEnd: ; preds = %SwitchProng, %SwitchElse, %SwitchRangeYes
%4 = phi i32 [ 2, %SwitchRangeYes ], [ 3, %SwitchElse ], [ 1, %SwitchProng ], !dbg !45
store i32 %4, i32* %x, align 4, !dbg !45
call void @llvm.dbg.declare(metadata i32* %x, metadata !42, metadata !DIExpression()), !dbg !47
ret void, !dbg !48
SwitchRangeNo: ; preds = %Entry
switch i32 %0, label %SwitchElse [
i32 1, label %SwitchProng
], !dbg !45
}
```
Zig is an open-source programming language designed for robustness, optimality, and maintainability.
Resources
Building from Source
Note that you can download a binary of master branch.
Stage 1: Build Zig from C++ Source Code
Dependencies
POSIX
- cmake >= 2.8.5
- gcc >= 5.0.0 or clang >= 3.6.0
- LLVM, Clang, LLD development libraries == 8.x, compiled with the same gcc or clang version above
- Use the system package manager, or build from source.
Windows
- cmake >= 2.8.5
- Microsoft Visual Studio 2017 (version 15.8)
- LLVM, Clang, LLD development libraries == 8.x, compiled with the same MSVC version above
- Use the pre-built binaries or build from source.
Instructions
POSIX
mkdir build
cd build
cmake ..
make install
MacOS
brew install cmake llvm@8
brew outdated llvm@8 || brew upgrade llvm@8
mkdir build
cd build
cmake .. -DCMAKE_PREFIX_PATH=/usr/local/Cellar/llvm/8.0.0
make install
Windows
See https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows
Stage 2: Build Self-Hosted Zig from Zig Source Code
Note: Stage 2 compiler is not complete. Beta users of Zig should use the Stage 1 compiler for now.
Dependencies are the same as Stage 1, except now you can use stage 1 to compile Zig code.
bin/zig build --build-file ../build.zig --prefix $(pwd)/stage2 install
This produces ./stage2/bin/zig which can be used for testing and development.
Once it is feature complete, it will be used to build stage 3 - the final compiler
binary.
Stage 3: Rebuild Self-Hosted Zig Using the Self-Hosted Compiler
Note: Stage 2 compiler is not yet able to build Stage 3. Building Stage 3 is not yet supported.
Once the self-hosted compiler can build itself, this will be the actual compiler binary that we will install to the system. Until then, users should use stage 1.
Debug / Development Build
./stage2/bin/zig build --build-file ../build.zig --prefix $(pwd)/stage3 install
Release / Install Build
./stage2/bin/zig build --build-file ../build.zig install -Drelease-fast