[LLVMbugs] [Bug 14077] New: [ARM][regression] incorrect struct initialisation when NEON enabled

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Oct 12 15:06:12 PDT 2012


             Bug #: 14077
           Summary: [ARM][regression] incorrect struct initialisation when
                    NEON enabled
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: mans at mansr.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9341
  --> http://llvm.org/bugs/attachment.cgi?id=9341
C test case

The attached C code, when compiled at -O2 or higher, results in incorrect
initialisation of a struct residing on the stack.

The function av_expr_eval() is inlined into the (unrolled) loop in main() at
line 89.  Here, the second iteration sets the non-zero members and _afterwards_
zeros the whole struct (line 123 in the assembly listing).

I bisected this to r163299 "Add a new optimization pass: Stack Coloring". 
Reverting this commit makes the problem go away.

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