[LLVMbugs] [Bug 1795] New: Missed optimization: eliminating loads around ptrtoint/ inttoptr

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1795

           Summary: Missed optimization: eliminating loads around
                    ptrtoint/inttoptr
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


define void @myfunc(i32 %.val24) {
EntryBlock:
        add i32 %.val24, -12
        inttoptr i32 %0 to i32*
        store i32 1, i32* %1
        add i32 %.val24, -16
        inttoptr i32 %2 to i32*
        getelementptr i32* %3, i32 1
        load i32* %4
        tail call i32 @ZZZ( i32 %5 )
        ret void
}

The "load i32* %4" always results in a "1", so it should be possible to
optimize it out (on x86).

At one point I had a hack in my tree to push addition forwards across inttoptr
instances in VisitIntToPtr, but I'm not sure if that's the right approach.


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