1. Improve JIT Compiling
L Y.H.
lyh.kernel@gmail.com

2. Project Blog
http://octave-jitc.blogspot.tw/

3. JITC
Just In Time Compiler for Octave
Google Summer of Code 2012
Max Brister
Use LLVM as JIT engine
~9000 SLOC

4. How JITC Works
JITC
LLVM Backend
Octave
LLVM IR
Optimizer
Parse Tree
SDAG
JITC Linear IR
SDAG
Optimizer
LLVM IR
JIT

5. Midterm Goal
Built-in functions support
function test1 ()
x = 1.0;
disp (x);
endfunction

6. Midterm Goal
Built-in functions support
Statements support
do - until
switch
…
i = 1;
x = 2;
do
i++;
x = x * 2;
until (i == 10)

7. Final Goal
Statements support
Functions support

8. Some Issues
LLVM now focus on MCJIT

9. Some Issues
LLVM now focus on MCJIT
LLVM API varies between different versions
LLVM IR has no change

10. Some Issues
LLVM now focus on MCJIT
LLVM API varies between different versions
LLVM IR has no change
JITC unaware code hotness

11. JITC unaware code hotness

12. Thank You
http://octave-jitc.blogspot.tw/