LLVM 21 moved the KnownFPClass definition from `ValueTracking.h` to its own file. I verified that specific version moved it, with 20 being the last without it.
Replaced the denormal/zero check in `fma32x4` with LLVM's `KnownFPClass` analysis.
That method now includes a overload which expects the caller to provide the known struct. This is used for memorization with the FMA instructions, where the range clamping and instruction specific special value handling are combined. `FMS` and `FNMS` has a larger search depth as it can potentially shorten the chain by a lot.
Replace constant checks in `FM`, `FCEQ`, and `FCMEQ` with `KnownFPClass`. The equality compares now also optimize for when the operands is infinity, which is safe as it behaves identically to the default path.
Avoid clamping if the value is known not to be Inf/NaN (overflow). Includes a optional precalculated argument, which only calculates the known if it has not been done already.
Optimize the float multiply and compare methods by taking advantage of the `denormals-are-zero` flag, removing duplicated logic, and generally doing things more efficiently.
Refactors SELB by changing "division accuracy correction" pattern match to reduce nesting, include more comments, and use more descriptive variable names. Also replaced duplicated granularity-check loops with single loop which determines byte granularity as a integer.
## Summary
- fall back from database-applied `SPU Decoder: Recompiler (ASMJIT)` to
`Recompiler (LLVM)` on ARM64 builds during boot
- log the fallback in `fixup_settings()` instead of letting SPU
initialization fail later
## Problem
`Need for Speed: Most Wanted [BLES01659]` receives `SPU Decoder:
Recompiler (ASMJIT)` from the config database. On ARM64 builds that
decoder is unsupported, which caused RPCS3 to abort during SPU
initialization with `Unsupported spu decoder` while the UI remained on
the loading screen.
## Validation
- built RPCS3 locally on macOS Apple Silicon
- booted `BLES01659` through the database config path with the custom
per-game override temporarily removed
- verified the log now shows the ARM64 fallback warning and `SPU
Decoder: Recompiler (LLVM)` instead of the previous fatal error
- observed the title proceed past the old boot blocker into active RSX
program compilation
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Co-authored-by: Elad <18193363+elad335@users.noreply.github.com>
Elad