memcpy requires non-overlapping arguments.
fifo.realign() handles this case correctly and tries to provide an
optimized implementation.
This probably wasn't hit in practice, as, in a typical usage, fifo's
head is not advanced.
The previous implementation of buffered_reader always reads from the
unbuffered reader into the internal buffer, and then dumps the data onto
the destination. This is inefficient, as sometimes it's possible to read
directly into the destination. The previous strategy generates more
memory copies and unbuffered reads than necessary.
See: https://devblogs.microsoft.com/directx/directx-adopting-spir-v
Since we never hooked up the (experimental) DirectX LLVM backend, we've never
actually supported targeting DXIL in Zig. With Microsoft moving away from DXIL,
that seems very unlikely to change.
Upgrades the LLVM, Clang, and LLD dependencies to LLVM 19.x
Related to #16270
Big thanks to Alex Rønne Petersen for doing the bulk of the upgrade work
in this branch.
This works around a problem that started happening with LLD around
version 18.1.8:
```
lld-link: error: duplicate symbol: .weak.__nexf2.default
>>> defined at CMakeFiles/zig2.dir/compiler_rt.c.obj
>>> defined at compiler_rt.lib(compiler_rt.lib.obj)
```
This reverts commit 7e66b6d0684fb1b3aa76381486e655e4d13bc0a5.
I don't think this is needed, I don't get any errors locally when I
bootstrap windows without this change.
Windows does not really have weak symbols. So when we bootstrap with `zig cc`
and link both Zig's compiler-rt and the CBE's `compiler_rt.c` we end up with
duplicate symbol errors at link time.
* Add `ProcessorAlias` support.
* Bump output buffer size.
* Include `i` extension in RISC-V baselines.
* Update evaluation branch quota for RISC-V.
* Retain some CPU features that LLVM removed.
* Flatten more 'meta-features' used for CPU models.
* Remove some superfluous dependencies.
