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Passing CompAllocator objects by value is advantageous because it no longer needs to be dynamically allocated and cached. CompAllocator instances can now be freely created, copied and stored, which makes adding new CompMemKind values easier.
Together with other cleanup this also improves memory allocation performance by removing some extra levels of indirection that were previously required - jitstd::allocator had a pointer to CompAllocator, CompAllocator had a pointer to Compiler and Compiler finally had a pointer to ArenaAllocator. Without MEASURE_MEM_ALLOC enabled, both jitstd::allocator and CompAllocator now just contain a pointer to ArenaAllocator. When MEASURE_MEM_ALLOC is enabled CompAllocator also contains a pointer but to a MemStatsAllocator object that holds the relevant memory kind. This way CompAllocator is always pointer sized so that enabling MEASURE_MEM_ALLOC does not result in increased memory usage due to objects that store a CompAllocator instance.
In order to implement this, 2 additional signficant changes have been made:
* MemStats has been moved to ArenaAllocator, it's after all the allocator's job to maintain statistics. This also fixes some issues related to memory statistics, such as not tracking the memory allocated by the inlinee compiler (since that one used its own MemStats instance).
* Extract the arena page pooling logic out of the allocator. It doesn't make sense to pool an allocator, it has very little state that can actually be reused and everyting else (including MemStats) needs to be reset on reuse. What really needs to be pooled is just a page of memory.
Since this was touching allocation code the opportunity has been used to perform additional cleanup:
* Remove unnecessary LSRA ListElementAllocator
* Remove compGetMem and compGetMemArray
* Make CompAllocator and HostAllocator more like the std allocator
* Update HashTable to use CompAllocator
* Update ArrayStack to use CompAllocator
* Move CompAllocator & friends to alloc.h
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* jit sources: Each local pointer variable must be declared on its own line.
Implement https://github.com/dotnet/coreclr/blob/master/Documentation/coding-guidelines/clr-jit-coding-conventions.md#101-pointer-declarations
Each local pointer variable must be declared on its own line.
* add constGenTreePtr
* delete GenTreePtr
* delete constGenTreePtr
* fix arm
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Cleanup some mixed type relops the JIT produces
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These need to be modified to work directly with JIT's allocator(s) instead of going through IAllocator. It may also be useful to adjust these to account for the fact that the JIT never releases memory.
Besides, the JIT is the primary user of these classes - only ExpandArray(Stack) isn't used anywhere else and SimplerHashTable's only other user is the gcinfo library.
Renamed headers and classes to avoid potential conflicts with the old ones.
Also made the JIT's hash table behavior the default to avoid the need to specify it in hash table instantiations.
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This tends to generate one virtual call for every allocation...
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fgMorphRecognizeBoxNullable produces a TYP_REF/TYP_BOOL relop because it doesn't change the constant type from TYP_REF to TYP_INT.
Loop cloning always produces TYP_LONG constants even though it doesn't support TYP_LONG iteration variables, limits etc.
These mixed type relops require lowering/codegen to do more work.
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Replace all uses of NodeName with OpName so we get proper names instead of symbols (e.g. ADD instead of +). Names stand out better, especially in JIT dumps where we use various symbols to draw tree lines.
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This change is the result of running clang-tidy and clang-format on jit
sources.
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http://blogs.msdn.com/b/dotnet/archive/2015/11/30/net-framework-4-6-1-is-now-available.aspx
.NET Framework list of changes in 4.6.1
https://github.com/Microsoft/dotnet/blob/master/releases/net461/dotnet461-changes.md
Additional changes including
- Working ARM64 JIT compiler
- Additional JIT Optimizations
o Tail call recursion optimization
o Array length tracking optimization
o CSE for widening casts
o Smaller encoding for RIP relative and absolute addresses in addressing modes
o Tracked Local Variable increased to 512
o Improved handling of Intrinsics System.GetType()
o Improved handling of Math intrinsics
- Work for the X86 Ryu-JIT compiler
[tfs-changeset: 1557101]
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This change fixes some of the warnings in the jitter code on Linux. With this change
combined with an upcoming change in the rest of the codebase, 16 warning disabling
options can be removed.
The issues in the jitter were:
1) Incorrect typedefs for const_reference and const_pointer (the const was ignored)
2) Member initiazalization order in class constructor didn't correspond to the member order in some classes
3) Objects with vtables were copied via memcpy. While this is intentional, cast of the pointers to void*
is required to silence clang warning
4) Comparing values of different enums - there are cases of two enums containing the same values.
5) Casting int to pointer - the cast was legal (forming a handle), adding cast to size_t in between used to fix the warning
6) "static struct" - removed the static keyword
7) Missing return value in methods with _ASSERTE
8) Class name classifier on methods in the .h
9) Specialized template member functions need to be defined out of the class
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[tfs-changeset: 1407945]
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