Fwd: [LLVMbugs] [Bug 623] NEW: request for -malloc2alloca optimization pass

Vikram S. Adve vadve at cs.uiuc.edu
Tue Aug 30 06:55:27 PDT 2005

Rob Bocchino has already written such a pass -- perhaps he can tell  
you more about how to use it.  It relies on an experimental pointer  
and escape analysis called DSA (analyze -tddatastructure) so please  
check results carefully.


Begin forwarded message:

> From: bugzilla-daemon at cs.uiuc.edu
> Date: August 30, 2005 6:22:38 AM CDT
> To: llvmbugs at cs.uiuc.edu
> Subject: [LLVMbugs] [Bug 623] NEW: request for -malloc2alloca  
> optimization pass
> http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=623
>            Summary: request for -malloc2alloca optimization pass
>            Product: tools
>            Version: trunk
>           Platform: PC
>         OS/Version: Linux
>             Status: NEW
>           Severity: enhancement
>           Priority: P2
>          Component: opt
>         AssignedTo: unassignedbugs at nondot.org
>         ReportedBy: eric at vanrietpaap.nl
> If such an optimization pass would do escape analysis pypy-llvm  
> might be able to
> use a lot less malloc. These are currently in pypy-llvm costly  
> becausewe use the
> Boehm garbage collector that obviously need to do more that a  
> normal malloc and
> free.
> Because the actual Boehm malloc is called GC_malloc this would need  
> to be an
> alias of malloc. In general it would be nice to be able tell the  
> optimizers
> about aliases of known functions (could that be useful for simplify- 
> libcalls
> translations, just guessing here). Or maybe this is already  
> possible by
> implementing an internal malloc in the .ll file. Not sure here,  
> will have to try
> that later.
> [If part two makes sence then this enhancement request should have  
> been split]
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