[llvm-bugs] [Bug 31209] New: Compiler crash with -fprofile-instr-use at -O0

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31209

            Bug ID: 31209
           Summary: Compiler crash with -fprofile-instr-use at -O0
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: rob.lougher at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17686
  --> https://llvm.org/bugs/attachment.cgi?id=17686&action=edit
crashdump

$ clang --version
clang version 4.0.0 (trunk 288143)

Reduced test-case:

$ cat foo.cpp
void fn1(void) __attribute__((__noreturn__));
void foo(void) {fn1(); }

Text-based IR profile:

$ cat profile.txt
# IR level Instrumentation Flag
:ir
_Z3foov
# Func Hash:
12884901887
# Num Counters:
1
# Counter Values:
0

Steps to reproduce crash:

$ llvm-profdata merge profile.txt --output=out.profdata
$ clang foo.cpp -O0 -c -fprofile-instr-use=out.profdata

#0 0x000000000367cfc7 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/llvm/lib/Support/Unix/Signals.inc:402:0
...

(crash dump attached)

The crash does not occur at -O1 or -O2.

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