[LLVMbugs] [Bug 11962] New: massive memory usage at -O2 and -Os

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11962

             Bug #: 11962
           Summary: massive memory usage at -O2 and -Os
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nobled at dreamwidth.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


LLVM: r150191
clang: r150194

Compiling the attached file at -O1 maxes out at about 234 MB. With -O2 and -Os,
I saw clang go over 2.3 GB before I had to kill the process:

clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free
-main-file-name "ARMDisassembler.ii" -pic-level 2 -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64
-momit-leaf-frame-pointer -g -coverage-file "ARMDisassembler.cpp.o"
-resource-dir "lib/clang/3.1" -fdeprecated-macro -fdebug-compilation-dir "."
-ferror-limit 19 -fmessage-length 113 -fvisibility-inlines-hidden
-mstackrealign -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak
-fobjc-fragile-abi -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -o "ARMDisassembler.cpp.o" -x c++-cpp-output
"ARMDisassembler.ii" -Os

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