[compiler-rt][ARM] Optimized double-precision FP mul/div (#179923)
Optimized AArch32 implementations of `muldf3` and `divdf3` are provided.
The division function is particularly tricky because its Newton-Raphson
approximation strategy requires a rigorous error bound. In this version
of the commit I've left out the full supporting machinery that validates
the error bound via Gappa and Rocq, but full details are provided via
links to the upstream version of this code in the Arm Optimized Routines
repository, and to a pair of Arm Community blog posts.
[clang-format] Add BreakBeforeReturnType option (#197268)
In certain codebases (e.g. embedded) — function declarations could
accumulate a long prefix of specifiers and attributes (`static`,
`inline`, `__attribute__((...))`, project-specific `AttributeMacros`,
etc.) before the return type, which buries the core prototype and pushes
parameters past the column limit.
This patch adds a `BreakBeforeReturnType` style option that places that
prefix on its own line(s):
```cpp
__attribute__((always_inline)) static inline
int do_thing(int a, int b, int c);
```
The recognized prefix tokens are function/storage specifiers (`static`,
`extern`, `inline`, `virtual`, `constexpr`, `consteval`, `friend`,
`export`, `_Noreturn`, `__forceinline`), C++11 attribute groups
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[Clang][Coroutines] Don't emit fake uses for coroutine parameters (#194690)
Fixes issue: https://github.com/llvm/llvm-project/issues/192351
The combination of coroutines with -fextend-variable-liveness has
resulted in use-after-free, caused by the fact that we insert fake uses
of coroutine parameters at the end of the coroutine. While this is fine
for normal functions, in coroutines these variables are stored in the
coroutine frame, which is freed before the end of the function; this
results in us loading from the deleted frame.
This patch fixes this by no longer emitting fake uses for most coroutine
parameters. Since coroutine parameters will be saved back to the frame
when we suspend, and currently may not be optimized out, fake uses are
not needed in this case, and so by not emitting them we avoid dealing
with the complexity of updating fake uses in the CoroSplit pass. The
exception to this is 'this', which is not saved to the frame.
(cherry picked from commit efb01c1bf558eaaf8ec64e1a54110584e827f21b)
