[LLVMbugs] [Bug 14642] New: error: illegal "f" output constraint; fatal error: error in backend: Access past stack top!

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14642

             Bug #: 14642
           Summary: error: illegal "f" output constraint; fatal error:
                    error in backend: Access past stack top!
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: M8R-9yw8a5 at mailinator.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


1. source code (file name: f.c):

void f(void)
{
    float x;
    __asm__ (
        ""
        : "=f" (x)
    );
}

2. command line:

clang -c f.c

3. output:

f.c:5:3: error: illegal "f" output constraint
                ""
                ^
fatal error: error in backend: Access past stack top!
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 3.3 (trunk 170425)
Target: i386-unknown-freebsd10.0
Thread model: posix

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