[llvm-bugs] [Bug 31171] New: [inline asm] clang ungracefull exit, asm regex

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31171

            Bug ID: 31171
           Summary: [inline asm]  clang ungracefull exit, asm regex
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ziv.izhar at intel.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

the following code crashes instead of gracefully exit:

void add(volatile int* __mem, int __val)
{
    __asm__ ("add{l} {%1,%0 {#dst last}|%0,%1}" /* illegal */
              : "=m" (*__mem) : "ir" (__val) );
}

output:

fatal error: error in backend: Nested variants found in inline asm string:
'add$(l$) $($1,$0 $(#dst last$)$|$0,$1$)'
clang-3.9: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir:
/opt/gcc-explorer/clang+llvm-3.9.0-x86_64-linux-gnu-ubuntu-16.04/bin
clang-3.9: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-3.9: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-3.9: note: diagnostic msg: /tmp/example-9ae93d.cpp
clang-3.9: note: diagnostic msg: /tmp/example-9ae93d.sh
clang-3.9: note: diagnostic msg:
********************
Compiler exited with result code 70

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