[LLVMbugs] [Bug 14034] New: potentially infinite loop in new SROA

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14034

             Bug #: 14034
           Summary: potentially infinite loop in new SROA
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: benny.kra at gmail.com
                CC: chandlerc at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9314
  --> http://llvm.org/bugs/attachment.cgi?id=9314
preprocessed source

The preprocessed source was generated from the linux kernel by tinti on IRC.
When compiling it the optimizer doesn't finish and uses a large amount of
memory. Debugger backtrace points to SROA's AllocaPartitionRewriter.

command line:
clang -cc1 -triple armv6-none--gnueabi -S -disable-free -disable-llvm-verifier
-main-file-name vcio.c -mrelocation-model static -mdisable-fp-elim
-relaxed-aliasing -mdisable-tail-calls -fmath-errno -mconstructor-aliases
-target-abi aapcs-linux -target-cpu arm1176jzf-s -msoft-float -mfloat-abi soft
-target-feature +soft-float -target-feature +soft-float-abi -target-feature
+vfp2 -target-feature -neon -target-feature -neon -momit-leaf-frame-pointer -g
-nostdsysteminc -nobuiltininc -sys-header-deps -O2 -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -Werror-implicit-function-declaration
-Wno-format-security -Wdeclaration-after-statement -Wno-pointer-sign
-fno-dwarf2-cfi-asm -fno-dwarf-directory-asm -ferror-limit 19 -fmessage-length
103 -fwrapv -mstackrealign -fno-signed-char -fobjc-runtime=gcc -fno-common
-fdiagnostics-show-option -fcolor-diagnostics -o /dev/null -x c
vcio-ydpHJk__1.i -w

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