[LLVMbugs] [Bug 2677] New: Qt compilation broken on x86-64/linux

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2677

           Summary: Qt compilation broken on x86-64/linux
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1922)
 --> (http://llvm.org/bugs/attachment.cgi?id=1922)
.cpp file

Consider attached testcase which is reduced from recent Qt (both .cpp source
and .bc attached). It compiled fine using llvm-g++ -O0, but produce invalid
result at -O2. 

Steps to reproduce: 
opt -std-compile-opts strtod.bc | llc -o strtod.s
g++ strtod.s
./a.out
echo $?

if everything is ok - return code should be zero. 

This prevents Qt compilation on x86-64/linux


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