[bugpoint] JIT debugger generates really inefficient function stubs

[lattner]

Bugzilla Link	576
Resolution	FIXED
Resolved on	Feb 22, 2010 12:41
Version	1.3
OS	All

Extended Description

Bugpoint has to emit function stubs that call getPointerToNamedFunction to find code generated by the
JIT. It would be nice if it only did this the first time it was called. Instead of emitting:

internal void %l33_main_no_exit_2E_i305_2E_i_wrapper(sbyte*, uint*) {
%resolver = call sbyte* %getPointerToNamedFunction( sbyte* getelementptr ([30 x sbyte]* %
l33_main_no_exit_2E_i305_2E_i_name, int 0, int 0) ) ; <sbyte*> [#uses=1]
%resolverCast = cast sbyte* %resolver to void (sbyte*, uint*)* ; <void (sbyte*, uint*)>
[#uses=1]
call void %resolverCast( sbyte %0, uint* %0 )
ret void
}

we would like to use something like a static var to remember this. This should be done in
Miscompilation.cpp:CleanupAndPrepareModules.

-Chris

[lattner]

assigned to @lattner

[lattner]

Oh yeah, this would make JIT debugging like 3x faster on some programs.

:)

-Chris

[lattner]

This enhancement is now implemented, patch here:
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050711/026997.html

-Chris