Hi all
Here is my small project - ability to move some code optimization
and generation to runtime.
Any function can be marked with special attribute and llvm
bitcode for it will saved in binary.
Then during runtime it will be optimized and compiled (and it can
use best available cpu instructions).
@runtimeCompile void bar()
{
...
}
...
// Somewhere in main
rtCompileProcess(settings); // Compile
bar();
Another feature - ability to create "runtime compiletime
variables" - you can set them during runtime and then they will
be treated as constants during optimization and codegeneration.
@runtimeCompile __gshared int var;
@runtimeCompile void bar()
{
// var is treated as constant in generated code and subject
to constant propagation, loop unrolling, etc
foreach(int i; 0..var)
{
}
if(var == 42) // This block will be removed comletely if var
is not 42
{
}
}
// Somewhere in main
var = 42;
rtCompileProcess(settings); // Compile
bar();
var = 13; // To see changed value in runtime compiled code
recompilation is required
rtCompileProcess(settings); // Compile
bar();
This is an early prototype and mostly untested but simple
examples work.
Hacked ldc sources are here:
https://github.com/Hardcode84/ldc/tree/runtime_compile
