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Details
: [bugpoint] JIT debugger generates really inefficient func...
Bug#: 576
: tools
: bugpoint
Status: RESOLVED
Resolution: FIXED
: All
: All
: 1.3
: P2
: enhancement
: 1.6

:
: quality-of-implementation
:
:
  Show dependency tree - Show dependency graph
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Reporter: Chris Lattner <sabre@nondot.org>
Assigned To: Chris Lattner <sabre@nondot.org>

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Description:   Opened: 2005-06-09 22:47
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
------- Comment #1 From Chris Lattner 2005-06-09 22:47:56 -------
Oh yeah, this would make JIT debugging like 3x faster on some programs.

:)

-Chris
------- Comment #2 From Chris Lattner 2005-07-11 20:02:35 -------
This enhancement is now implemented, patch here:
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20050711/026997.html

-Chris

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