This peephole removes unnecessary masking operations when the mask is
provably all 1s. This improves performance in GB7 'Asset Compression' by
about 2% with SVE and about 4% without SVE.
When binfmt_misc is not visible, execve of an x86 ELF reexecs FEX by path.
That drops the caller-supplied argv[0] and asks the next FEX to reopen the
file through RootFS. Keep the resolved ELF in FEX_EXECVEFD, retain argv[0],
and mark the FD as path-backed so /proc/self/exe stays the real path.
Anonymous memfd execution is unchanged.
A bit messy but it basically duplicates the Linux side. We don't have a
way to include NT internal defines in to FEXCore currently so the two
required symbols are just forward declared.
Adds a config option to disable pruning if desired.
Had to change FEXCore::HostFeatures slightly to remove the HostType from
the Hash for caching, as we don't want the bucket to inadvertently
delete wow64,arm64ec,linux buckets when executing in the same namespace.
Minor changes to the DiskCache::Init code to handle returning two
values, moving the HostType to be a part of the "ProcessBucketHash"
instead of the "MachineBucketHash".
Then uses the directory walking function added in the previous commit to
find mismatched/old "MachineBucketHash" directories and remove them.
The base directory is now the machine bucket, which is everything that affects
codegen that you can ask FEX about offline: FEX compiler version, host features.
The DB files now carry a process bucket, which is everything else that can
affect codegen, on the user/process side: 32-bitness and config.
Both together are still the bucket hash that gets laced into every lookup key,
so we still won't load mismatching code because a file is in the wrong spot.
In order to reuse code buffers, when invalidating we will no longer be
able to invalidate code while inside the code we are invalidating.
Changes the IR operation to be a block ender itself and control jumping
to the new RIP. This way it can invalidate from the dispatcher and just
restart JIT execution.
Have it treated as a block terminator IR and instead of doing
syscall+exitfunction, just do syscall and jump in to the dispatcher.
This is necessary for code invalidation and reuse for code that is stuck
in long running syscalls. We'll need to do something similar for thunks
later, although the recursive nature of thunk+callback can make that a
little squirrely.
Justin Becker