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...region and > then x86 backend reorder loads/store thus generating a BUG. Just for the record it seems this is a bug in your frontend, not in the LLVM backend. The memcpy intrinsic, like the standard memcpy function, requires that the regions be non-overlapping: http://llvm.org/docs/LangRef.html#int_memcpy By violating this contract it's possible you'll encounter all sorts of issues in other passes too. - David

Hello Devang, answers are interleaved 2011/12/7 Devang Patel <dpatel at apple.com> > Hello, > > On Dec 7, 2011, at 2:07 AM, Seb wrote: > > > Hi all, > > > > I would like to add an option for LLVM 'opt' to disable a specific > optimization pass from command line. > > > > The idea is to have something like: > > > > opt -O2

...backend reorder loads/store thus generating a BUG. > > Just for the record it seems this is a bug in your frontend, not in > the LLVM backend. The memcpy intrinsic, like the standard memcpy > function, requires that the regions be non-overlapping: > http://llvm.org/docs/LangRef.html#int_memcpy By violating this > contract it's possible you'll encounter all sorts of issues in other > passes too. > > - David > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20111209/9a35522e/atta...

Clang is inserting an llvm.memcpy function call into my program where it does not exist (the code never calls memcpy), is there a particular reason for this? It also looks like it's inserting two other artificial function calls, something to do with llvm.lifetime.start and llvm.lifetime.end, what are these functions and why are they being inserted artificially? Thanks. -------------- next