Should allow certain splats to opportunistically emit the best assembly when possible.
Also use `std::bit_cast` rather than an inline `union` type to directly
cast a `float` into a `uint32_t`.
The `BRK` instruction code needs to be specified correctly so that a debugger can handle it properly(and continue from it). `brk 0xF000` implements a debug-breakpoint that can be continued from, and `brk 0xF001` is implemented an assertion failing. Any other codes like `0` and `F1` will not be able to be continued from or handled correctly by debuggers.
These seem to be standard brk codes:
```
Breakpoint 0xF000
Assert 0xF001
Debug Service 0xF002
Fastfail 0xF003
Divide by 0 0xF004
```
Rather than using a `mov` and vector-`dup` for vector-splats, just use the `movi` instruction where applicable(8-bit element-splats).
Eventually we might want to detect opportunities to use `FMOV` and the 64-bit form of `MOVI` over in `LoadV128Const`.
Track PPC scalar FP state in the backend context and restore it at
host/guest boundaries so translated FP code has a stable rounding mode.
Convert remaining VMX sequences to scoped EmitWithVmxFpcr. Remove
unnecessary ChangeFpcrMode from sequences that only call native helpers.
Co-Authored-By: Reality <reality@xenios.jp>
Save and restore FPCR around each VMX FP operation so vector code
doesn't leak FPCR state into scalar paths. Drop the DN bit so NaN
propagation fixup can inspect original payloads.
The A64 sequence table is populated by registration statics spread across
multiple translation units. Keeping the backing map as a global object makes
registration depend on cross-TU initialization order and can hit the table
before it has been constructed.
Move the sequence table behind a function-local static so sequence
registration is safe regardless of which unit initializes first.
Based entirely off existing xbyak x86 implementation and available
tests. Still needs a lot of optimization and testing on non-Windows
platforms.
So far passes all tests and boots at least some games on Windows.
