
<html><body><p>Hi,<br><br>I have a question regarding PGO.<br><br>I collected profile data with the instrumentation build (-fprofile-instr-generate) and provided for PGO optimization in the second build (with -fprofile-instr-use=xxx.profdata). This works fine.<br><br>Then I tried to provide the profile data to opt using the option -pgo-instr-use, but this causes an error with the message: "Not an IR level instrumentation profile".<br>I thought this error occurred because the profile data was produced by the instrumentation 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).<br><br>$ clang -c -o main.bc -O2 -m64 -emit-llvm main.c<br>$ opt -pgo-instr-gen main.bc -o main_inst.bc<br>$ llc main_inst.bc -o main_inst.s<br>instrprof failed to lower an increment<br>UNREACHABLE executed at /home/suganuma/tools/llvm_new/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:5245!<br>#0 0x00000000815ecc7a llvm::sys::PrintStackTrace(llvm::raw_ostream&) /home/suganuma/tools/llvm_new/llvm/lib/Support/Unix/Signals.inc:322:0<br>#1 0x00000000815ed02a PrintStackTraceSignalHandler(void*) /home/suganuma/tools/llvm_new/llvm/lib/Support/Unix/Signals.inc:380:0<br>#2 0x00000000815eb33e llvm::sys::RunSignalHandlers() /home/suganuma/tools/llvm_new/llvm/lib/Support/Signals.cpp:44:0<br>...<br>#7 0x0000000081577202 /home/suganuma/tools/llvm_new/llvm/lib/Support/ErrorHandling.cpp:117:0<br>#8 0x000000008139792a llvm::SelectionDAGBuilder::visitIntrinsicCall(llvm::CallInst const&, unsigned int) /home/suganuma/tools/llvm_new/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:5247:0<br>#9 0x000000008139b11c llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) /home/suganuma/tools/llvm_new/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:5811:0<br>#10 0x00000000813737e4 llvm::SelectionDAGBuilder::visit(unsigned int, llvm::User const&) /home/suganuma/tools/llvm_new/llvm/include/llvm/IR/Instruction.def:186:0<br>...<br><br>Am I doing something wrong? How can we provide profile data to opt? <br>What actually I want to do is to dump call graph (cross module) and cfg that reflect counter values from profile data.<br><br>Thank you,<br>--Toshio<BR>

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