[LLVMbugs] [Bug 9587] New: convert floating point divides by constants into multiplies when possible

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9587

           Summary: convert floating point divides by constants into
                    multiplies when possible
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: jmuizelaar at mozilla.com
                CC: llvmbugs at cs.uiuc.edu


It should be be possible to turn floating point divides into multiplies by the
reciprocal when the reciprocal can be represented exactly. For example: x/2.
can be converted into x*0.5.

GCC does this optimization and it improves the generated code in qcms.

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