BitC# High performance LLVM compiler
Key features
- Very low global pause allocation 10-30 ms
- Allocation is tunable between high performance ( within 3% of malloc) and low global pauses
- Sub typing we retain support for inheritance to port C#/Java and C++ code. Eventualy we will merge with Bitc or if that does not eventuate adopt a sucinct Trait based type system.
- SIMD expression as part of the language , not platform specific intrinsics.. Express problems in a way that will allow the compiler to use parralel SIMD for up to 10* performance.
- Support for embedded arrays in objects for native interop.
- Whole object life pinning for easy interop
- Call C libs or use BitC# as a lib for existing C / C++ /C#
- Slices , UTF8 strings and special format provide very printing strings to an IO buffer
- Fast IO with no copy needed to and from managed space.
- Very low safety impact no Header , no CardTable , optional bounds checking .
Comparison to C#
- Can work with native objects
- Superior support for value types ( no auto boxing and arrays embedded in objects)
- Call native and Be called by native
- Static compile to binary so can be deployed without CLR.
- Low pause GC
- No managed costs
- Easy to write SIMD
Comparison to Rust/D
- Simple to program
- Easy to write high performance SIMD
- Higher level style.
Comparison to C/C++
- Fast to program
- Safe
- Quicker to write high performing programs
Mile stones Use Mono compiler & parser .( No Generics , prob C#1 ) ( Cancelled using Coco/R)
M1 Update and build compiler ( update code from LLVM# to generate LLVM IR) , 1 month ( 2-3 months later to mature it)
M1.1 Update to LLVM 3.4 ( 1 week)
M1.2 Rewrite Tests , add test runner and get mono tests ( 2 weeks)
M2 Add ref counting for allocations ( just a malloc wrap at this point) 1/2 - 1 week + 2 week for tests
M2.1 More testing
M3 Remove unsafe from fixed blocks by having a safe way to address it (slices or gen array code) and add compile failure on auto boxing if type is marked nobox.. This is very tricky in C#. 2 weeks + slices ?
M4 Upgrade GC to add no header on Nursery objects , block allocated nursery ( local thread allocator) , with a global pause and parralel mark/ sweep . Small global pauses is obviously small nursery.2 weeks.
M5 Add better allocation to main Nursery . Extensive Benchmarks . 2 weeks
M6 Add Slices and strings standard lib. 2 weeks
M7 Add VecImp , 2 months
M8 Add Cinterop ( which users can use to host as winrt objects) . 1 week
M9 Deploy LLVM execution engine libs as default , native as option. No Bounds checking on Single threaded release code.
M10 Remove cycles , 1 month
Longer term goals
- Traits and fast coding.
- Region system to move code onto the stack automatically, resulting in lower heap usage and higher performance.
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