[LLVMbugs] [Bug 17988] New: incorrect floating point results

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Nov 18 21:31:42 PST 2013


            Bug ID: 17988
           Summary: incorrect floating point results
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: m.pavanakumar at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11566
  --> http://llvm.org/bugs/attachment.cgi?id=11566&action=edit
Extract and type ./compile to compile the code ... Creates executable testBug

Attaching a piece of C++ code which gives wrong floating point result with
clang++. But gives correct results in the following compilers (tested) 
1) g++ >= 4.2 and 2) icpc > 11.0

Expected output
Flux = 0.57735  0.989578  0.412228  0.412228  1.73147

Actual output from clang
Flux = 0.508632  0.797979  0.383204  0.383204  1.20769

This bug is reproducible in clang shipped with Xcode 5.0 on OSX Maverics and
clang 3.1-svn. valgrind shows no errors and using -O0 does not help either.

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