[LLVMbugs] [Bug 1822] New: instcombine misses select i1 %X, %Y, %X

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Nov 24 16:09:36 PST 2007


           Summary: instcombine misses select i1 %X, %Y, %X
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu

I found this line of code in a testcase from Pypy. Not sure if this is actually
there or if it's just a bugpoint artefact, but regardless:

  %v1650 = select i1 %v1652, i1 %v1653, i1 %v1652

should become %v1650 = and i1 %v1653, i1 %v1652. Similarly, the opposite
(switch the last two args to select) should become an Or. The codegen catches
these cases anyways.

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