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https://codeberg.org/ziglang/zig
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9ed599b4e3
* work around a stage1 miscompilation leading to the wrong integer comparison predicate being emitted. * fix the bug of not annotating callsites with the calling convention of the callee, leading to undefined behavior. * add the `nobuiltin` attribute when building freestanding libc or compiler_rt libraries to prevent e.g. memcpy from being "optimized" into a call to itself. * compiler-rt: change a call to be comptime to make the generated LLVM IR simpler and easier to study. I still can't enable the widening tests due to the compiler-rt compare function being miscompiled in some not-yet-diagnosed way.
This compiler-rt library is ported from LLVM.
It's needed because LLVM emits library calls to compiler-rt when hardware lacks functionality, for example, 64-bit integer multiplication on 32-bit x86.
This library is automatically built as-needed for the compilation target and then statically linked and therefore is a transparent dependency for the programmer.
Any bugs should be solved by trying to duplicate the bug upstream.
- If the bug exists upstream, get it fixed with the LLVM team and then port the fix downstream to Zig.
- If the bug only exists in Zig, something went wrong porting the code, and you can run the C code and Zig code side by side in a debugger to figure out what's happening differently.