[LLVMbugs] [Bug 19472] New: SLP vectorization emits unsupported vectorized bswap on ARM

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19472

            Bug ID: 19472
           Summary: SLP vectorization emits unsupported vectorized bswap
                    on ARM
           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: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12399
  --> http://llvm.org/bugs/attachment.cgi?id=12399&action=edit
Input source file that triggers vectorized bswap

The SLP vectorizer is producing a v4i32 variant of bswap that the ARM target
can't lower. The error message is as follows:

fatal error: error in backend: Cannot select: 0xf8347f60: v4i32 = bswap
0xf8343d78 [ORD=34] [ID=49] dbg:external/libpng/pngrutil.c:43
  0xf8343d78: v4i32 = bitcast 0xf8348f08 [ORD=33] [ID=48]
dbg:external/libpng/pngrutil.c:43
    0xf8348f08: v2f64,ch = load 0xf8347930, 0xf83860d0,
0xf8349778<LD16[%35](align=4)> [ORD=33] [ID=47]
dbg:external/libpng/pngrutil.c:43
      0xf83860d0: i32 = add 0xf8386280, 0xf8347ed0 [ORD=21] [ID=33]
dbg:external/libpng/pngrutil.c:1233
        0xf8386280: i32 = FrameIndex<1> [ID=1]
        0xf8347ed0: i32 = Constant<8> [ID=8]
      0xf8349778: i32 = undef [ID=2]
In function: png_handle_cHRM


I am running with the following command line and have attached the preprocessed
.i file that breaks:

clang -cc1 -triple thumbv7--linux-androideabi -S -disable-free
-disable-llvm-verifier -main-file-name pngrutil.c -mrelocation-model pic
-pic-level 2 -pie-level 2 -relaxed-aliasing -fmath-errno -masm-verbose
-no-integrated-as -mconstructor-aliases -munwind-tables -fuse-init-array
-target-cpu cortex-a8 -target-feature +soft-float-abi -target-feature +neon
-target-abi aapcs-linux -mfloat-abi soft -target-linker-version 2.22 -v -g
-ffunction-sections -fdata-sections -coverage-file /tmp/pngrutil-d27ed9.s
-nostdsysteminc -resource-dir
/usr/local/google/home/srhines/android_trees/aosp/prebuilts/clang/linux-x86/host/3.5/bin/../lib/clang/3.4
-dependency-file
out/target/product/manta/obj/STATIC_LIBRARIES/libpng_intermediates/pngrutil.d
-MT
out/target/product/manta/obj/STATIC_LIBRARIES/libpng_intermediates/pngrutil.o
-sys-header-deps -isystem system/core/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
external/skia/include -isystem out/target/product/manta/obj/include -isystem
bionic/libc/arch-arm/include -isystem bionic/libc/include -isystem
bionic/libstdc++/include -isystem bionic/libc/kernel/uapi -isystem
bionic/libc/kernel/uapi/asm-arm -isystem bionic/libm/include -isystem
bionic/libm/include/arm -isystem
prebuilts/clang/linux-x86/host/3.5/lib/clang/3.5/include/ -isystem
out/target/product/manta/obj/include/clang -include
build/core/combo/include/arch/linux-arm/AndroidConfig.h -D _FORTIFY_SOURCE=2 -D
ANDROID -D NDEBUG -D NDEBUG -U DEBUG -D __compiler_offsetof=__builtin_offsetof
-I external/zlib -I external/libpng -I
out/target/product/manta/obj/STATIC_LIBRARIES/libpng_intermediates -I
out/target/product/manta/gen/STATIC_LIBRARIES/libpng_intermediates -I
libnativehelper/include/nativehelper -I
build/core/combo/include/arch/linux-arm/ -internal-isystem
/usr/local/google/home/srhines/android_trees/aosp/prebuilts/clang/linux-x86/host/3.5/bin/../lib/clang/3.4/include
-Os -Wno-multichar -Werror=format-security -W -Wall -Wno-unused -Winit-self
-Wpointer-arith -Werror=return-type -Werror=non-virtual-dtor -Werror=address
-Werror=sequence-point -Wstrict-aliasing=2 -std=gnu89 -fno-dwarf-directory-asm
-fdebug-compilation-dir /usr/local/google/home/srhines/android_trees/aosp
-ferror-limit 19 -fmessage-length 0 -ftrapv -stack-protector 1 -mstackrealign
-fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops
-vectorize-slp -o /tmp/pngrutil-d27ed9.s -x c pngrutil.i

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