[LLVMdev] x86 unwind support

[Luke Dalessandro]

Kenneth Uildriks wrote:
> 3. Perhaps a pass that lowers unwinds to an EH intrinsic?  Would that
> map well without adding more overhead than the current setjmp/longjmp
> lowering pass?

In the past there have been suggestions that a good approach would be to 
target the libunwind (http://www.nongnu.org/libunwind/) library 
interface in a lowering pass. This could provide both low "availability" 
overhead and low "use" overhead.

If libunwind had setjmp/longjmp implementations for your platform (I 
think they're currently only available in IA64), then it would be 
trivial to use a setjmp/longjmp lowering pass and get what you want.

I keep wanting to do this but it always seems to get bumped off of my 
critical path.

Luke

> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev