Ryan Houdek 76bd81af15 FEXCore: Defer setting x87 softflow rounding mode until use ...

Currently FEX will always jump out of the JIT any time FCW was getting
written to, ensuring that the softfloat state is setup to rounding at
the time of FCW getting written.
This has the unintended side-effect that even in "x87 reduced precision"
mode we were jumping out of the JIT.
This hit a real world use case of an installer reloading FCW after every
x87 operation and generating a block with 2297 instructions.

Instead when jumping out of the JIT for handling x87 operations, load
FCW and pass it as the first argument of the handler. Setting the
softfloat state at that point.

This helps the installer's hottest block by cutting it down to 1477
instructions. 64.3% of the original size. The code block is still
burning 90% of the CPU time of the installer but the performance is
significantly better while it is doing its decompression.

In order to optimize this installer's block of code more then we will
likely need to optimize out x87 stack usage.

2023-09-12 05:21:06 -07:00

..

Crypto.cpp

Arm64: Optimize AES operations by caching a zero register

2023-08-30 19:00:43 -07:00

Flags.cpp

OpcodeDispatcher: Defer PF invert

2023-09-05 15:58:18 -04:00

Vector.cpp

FEXCore: Defer setting x87 softflow rounding mode until use

2023-09-12 05:21:06 -07:00

X87.cpp

FEXCore: Defer setting x87 softflow rounding mode until use

2023-09-12 05:21:06 -07:00

X87F64.cpp

FEXCore: Defer setting x87 softflow rounding mode until use

2023-09-12 05:21:06 -07:00