[LLVMdev] Folding instructions on X86

[Fernando Magno Quintao Pereira]

Dear LLVMers,

      I need help with one error in my register allocator. I am getting
errors when folding instructions for the x86 (it does not happen when
I use the PowerPC as target). The problem is that, when I execute
something like: mi = mbb->insert(mbb->erase(mi), fmi), where mbb is a 
MachineBasicBlock, valgrind gives this error message:

Address 0x42C62B0 is 24 bytes inside a block of size 28 free'd

     at 0x401C35D: operator delete(void*)(vg_replace_malloc.c:244)
     by 0x83E4A7B: llvm::iplist<llvm::MachineInstr,
llvm::ilist_traits<llvm::MachineInstr> 
>::erase(llvm::ilist_iterator<llvm::MachineInstr>) (ilist:323)
     by 0x83E464D: 
llvm::MachineBasicBlock::erase(llvm::ilist_iterator<llvm::MachineInstr>) 
(MachineBasicBlock.h:168)

Do you guys know any possible reason of why this would happen when 
producing code for the X86, but not for the PowerPC?

Best regards,

Fernando