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2016 Mar 09
3
PGO question
...trumentation build from the source level, not IR level. However, if I try to make -pgo-instr-gen for the opt command, the resulting bitcode seems to cause a problem as follows (my environment is 3.9.0, mid Feb trunk). $ clang -c -o main.bc -O2 -m64 -emit-llvm main.c $ opt -pgo-instr-gen main.bc -o main_inst.bc $ llc main_inst.bc -o main_inst.s instrprof failed to lower an increment UNREACHABLE executed at /home/suganuma/tools/llvm_new/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:5245! #0 0x00000000815ecc7a llvm::sys::PrintStackTrace (llvm::raw_ostream&) /home/suganuma/tools/llvm_new/llvm/...