[LLVMbugs] [Bug 1622] New: Slow compilation time

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1622

           Summary: Slow compilation time
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: asl at math.spbu.ru
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=1092)
 --> (http://llvm.org/bugs/attachment.cgi?id=1092)
.ll input. bzip'ed

Consider attached testcase. This is just -O0 -emit-llvm output of cleanup1.C
file from gcc testsuite.

I'm seeing multiple issues:

1. mem2reg creates much dead phi's: after mem2reg there are 16k phi's. Only
half of them are live.
2. ./opt -std-compile-passes eats all memory here (2Gb) and dies
3. llc -enable-eh time is pretty much (~10 mins).


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