Ryan Houdek aa3bacd938 FEXCore: Optimize memcpy and memset when direction is compile time constant ...

This usually happens on backwards memcpy where we know the direction of
the copy because the code will typically do as follows:

```
std
rep movsb
cld
```

This is because the direction flag is part of the ABI and needs to be
set back to the forward direction if it was modified.
This typically doesn't get picked up on forward copies because we won't
have visibility of a cld instruction in the block.

This optimization allows us to only emit half of the code for the memcpy
if it is a compile time constant.

There's definitely some future task that could assume forward direction
if unknown and recompile the code if the assumption has failed, but not
doing that here.

2023-11-19 04:17:10 -08:00

..

Arm64

FEXCore: Optimize memcpy and memset when direction is compile time constant

2023-11-19 04:17:10 -08:00

JITCore.h

FEXCore/Interface/Core/JIT: Adds SPDX identifier

2023-09-19 17:33:15 -07:00