[llvm-bugs] [Bug 25339] New: Clang breaks ART build with "Constant Island pass failed to converge!"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25339

            Bug ID: 25339
           Summary: Clang breaks ART build with "Constant Island pass
                    failed to converge!"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: srhines at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

With a recent TOT Clang, we noticed the following internal error in the ARM
backend.

FAILED: /bin/bash -c "(true) && (mkdir -p
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/)
&& (PWD=/proc/self/cwd  prebuilts/clang/host/linux-x86/3.8/bin/clang++ -I
external/gtest/include -I external/icu/icu4c/source/common -I
external/valgrind/include -I external/valgrind -I external/vixl/src -I
external/zlib -I bionic/libc/private -I art/runtime -I art/disassembler -I
art/compiler -I
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates
-I
out/target/product/bullhead/gen/SHARED_LIBRARIES/libart-compiler_intermediates
-I libnativehelper/include/nativehelper \$(cat
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/import_includes)
-isystem system/core/include -isystem system/media/audio/include -isystem
hardware/libhardware/include -isystem hardware/libhardware_legacy/include
-isystem hardware/ril/include -isystem libnativehelper/include -isystem
frameworks/native/include -isystem frameworks/native/opengl/include -isystem
frameworks/av/include -isystem frameworks/base/include -isystem
out/target/product/bullhead/obj/include -isystem
device/lge/bullhead/kernel-headers -isystem
hardware/qcom/msm8994/kernel-headers -isystem bionic/libc/arch-arm/include
-isystem bionic/libc/include -isystem bionic/libc/kernel/uapi -isystem
bionic/libc/kernel/common -isystem bionic/libc/kernel/uapi/asm-arm -isystem
bionic/libm/include -isystem bionic/libm/include/arm -c    -fno-exceptions
-Wno-multichar -msoft-float -ffunction-sections -fdata-sections -funwind-tables
-fstack-protector -Werror=format-security -D_FORTIFY_SOURCE=2 -fno-short-enums
-no-canonical-prefixes -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon -DANDROID
-fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith
-Werror=return-type -Werror=non-virtual-dtor -Werror=address
-Werror=sequence-point -DNDEBUG -g -Wstrict-aliasing=2 -DNDEBUG -UDEBUG 
-D__compiler_offsetof=__builtin_offsetof -Werror=int-conversion
-Wno-reserved-id-macro -Wno-format-pedantic -Wno-unused-command-line-argument
-fcolor-diagnostics -nostdlibinc  -target arm-linux-androideabi    -target
arm-linux-androideabi
-Bprebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/arm-linux-androideabi/bin
   -fvisibility-inlines-hidden -Wsign-promo  -Wno-inconsistent-missing-override
-nostdlibinc  -target arm-linux-androideabi   -mthumb -Os -fomit-frame-pointer
-fno-strict-aliasing  -fno-rtti -fno-rtti -std=gnu++11 -ggdb3 -Wall -Werror
-Wextra -Wstrict-aliasing -fstrict-aliasing -Wunreachable-code
-Wredundant-decls -Wshadow -Wunused -fvisibility=protected
-DART_DEFAULT_GC_TYPE_IS_CMS -DIMT_SIZE=64 -DART_TARGET
-DART_BASE_ADDRESS=0x70000000 -DART_ENABLE_CODEGEN_arm
-DART_ENABLE_CODEGEN_arm64 -DART_ENABLE_CODEGEN_mips
-DART_ENABLE_CODEGEN_mips64 -DART_ENABLE_CODEGEN_x86
-DART_ENABLE_CODEGEN_x86_64 -DART_BASE_ADDRESS_MIN_DELTA=-0x1000000
-DART_BASE_ADDRESS_MAX_DELTA=0x1000000 -O3 -Wframe-larger-than=1728 -fPIC
-D_USING_LIBCXX -Wthread-safety -Wthread-safety-negative -Wimplicit-fallthrough
-Wfloat-equal -Wint-to-void-pointer-cast -Wused-but-marked-unused -Wdeprecated
-Wunreachable-code-break -Wunreachable-code-return -Wmissing-noreturn
-std=gnu++14  -Werror=int-to-pointer-cast -Werror=pointer-to-int-cast
-Werror=address-of-temporary -Werror=null-dereference -Werror=return-type   -MD
-MF
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.d
-o
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.o
art/compiler/optimizing/intrinsics_arm64.cc) && (cp
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.d
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.P;
sed -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\\\\$//' -e '/^\$/ d' -e 's/\$/
:/' <
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.d
>>
out/target/product/bullhead/obj_arm/SHARED_LIBRARIES/libart-compiler_intermediates/optimizing/intrinsics_arm64.P)"
fatal error: error in backend: Constant Island pass failed to converge!
clang++: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 3.8.243773 
Target: arm--linux-android
Thread model: posix
clang++: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /buildbot/tmp/intrinsics_arm64-a807fb.cpp
clang++: note: diagnostic msg: /buildbot/tmp/intrinsics_arm64-a807fb.sh
clang++: note: diagnostic msg:

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