[LLVMbugs] [Bug 6050] New: floating-point operations have side effects

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=6050

           Summary: floating-point operations have side effects
           Product: new-bugs
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


Floating-point instructions, such as add, sub, mul, and div, as well as math
library functions in -fno-math-errno mode, are considered to have no side
effects in LLVM.  This is incorrect; they may set floating-point exception
flags, and they may trap if the processor is configured to trap on
floating-point exceptions.

As a consequence of this, these side effects may be reordered or eliminated by
the optimizer and codegen.


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