[Bug tree-optimization/36917] New: [4.3 regression] miscompilation with -O2 and r136501

["doko at ubuntu dot com" <gcc-bugzilla at gcc dot gnu dot org>]

OpenJDK (using the IcedTea6 build and patches) fails to build with 4.3 from the
4.3 branch, when the jvm built in stage1 is used for the first time in the
stage2 build:

-def-pcompile:
    [javac] Compiling 2 source files to
/scratch/packages/openjdk/x/openjdk-6-6b11/openjdk/control/build/linux-i586/langtools/build/toolclasses
WARNING: Default charset US-ASCII not supported, using ISO-8859-1 instead
    [javac]
/scratch/packages/openjdk/x/openjdk-6-6b11/openjdk/langtools/make/tools/CompileProperties/CompileProperties.java:26:
cannot access unnamed package
    [javac] ANSI_X3.4-1968
    [javac] import java.io.BufferedWriter;
    [javac] ^

BUILD FAILED

the build failure is not seen when reverting r136501; seen as well when just
reverting the two hunks for record_numbers_of_iterations.

seen with -O3 and -O2, not -O1.

not seen on amd64 and sparc (the other two archs using OpenJDK hotspot).

the miscompiled file is ciTypeFlow.cpp, compiled using
g++-4.3 -fpic -fno-rtti -fno-exceptions -D_REENTRANT -fcheck-new -g -m32
-march=i586 -mtune=generic -O2 -fno-strict-aliasing -DVM_LITTLE_ENDIAN 
-Wpointer-arith -Wconversion -Wsign-compare -c ciTypeFlow.cpp


-- 
           Summary: [4.3 regression] miscompilation with -O2 and r136501
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: doko at ubuntu dot com
GCC target triplet: i486-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36917