Failed to compile opus with clang (r14b or r15 beta 1)

[lakeman]

Attempting to compile silk/NSQ_del_dec.c from the opus codec (http://downloads.xiph.org/releases/opus/opus-1.1.4.tar.gz) for armeabi, using ndk-build fails when executing the following command;

$ ${NDK}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang \
        -MMD -MP -MF \
        ${OUTPUT}/NSQ_del_dec.o.d \
        -gcc-toolchain ${NDK}/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 \
        -fpic -ffunction-sections -funwind-tables -fstack-protector-strong -Wno-invalid-command-line-argument \
        -Wno-unused-command-line-argument -no-canonical-prefixes -fno-integrated-as -g \
        -target armv5te-none-linux-androideabi -march=armv5te -mtune=xscale -msoft-float -mthumb -Os \
        -DNDEBUG  -I${OPUS}/include \
        -I${OPUS}/silk \
        -I${OPUS}/silk/fixed \
        -I${OPUS}/celt \
        -I${OPUS} \
        -DANDROID -DNULL=0 -DSOCKLEN_T=socklen_t -DLOCALE_NOT_USED -D_LARGEFILE_SOURCE=1 -D_FILE_OFFSET_BITS=64 \
        -Drestrict='' -D__EMX__ -DOPUS_BUILD -DFIXED_POINT=1 -DDISABLE_FLOAT_API -DUSE_ALLOCA -DHAVE_LRINT \
        -DHAVE_LRINTF -DAVOID_TABLES -w -std=gnu99 -O3 -fno-strict-aliasing -fprefetch-loop-arrays -fno-math-errno \
        -Wa,--noexecstack -Wformat -Werror=format-security    \
        --sysroot ${NDK}/platforms/android-16/arch-arm  \
        -c ${OPUS}/silk/NSQ_del_dec.c \
        -o ${OUTPUT}/NSQ_del_dec.o

Output;

fatal error: error in backend: Cannot select: 0x4582860: i32 = ARMISD::SSAT 0x45350e0, Constant:i32<15>
  0x45350e0: i32 = sra 0x4538560, Constant:i32<1>
    0x4538560: i32 = add 0x4537990, Constant:i32<1>
      0x4537990: i32 = sra 0x4581c20, Constant:i32<7>
        0x4581c20: i32 = add 0x45355b0, 0x4535310
          0x45355b0: i32 = add 0x4582780, 0x45ca3b0
            0x4582780: i32 = sra 0x4538020, Constant:i32<16>
              0x4538020: i32 = mul 0x45ca570, 0x45ca110
                0x45ca570: i32 = sra 0x4582010, Constant:i32<16>
                  0x4582010: i32 = shl 0x45326d0, Constant:i32<16>


                  0x45ca340: i32 = Constant<16>
                0x45ca110: i32 = and 0x4534cf0, 0x45c9e00
                  0x4534cf0: i32,ch = load<LD4[%812]> 0x452ef10, 0x45ca810, undef:i32


                  0x45c9e00: i32 = AssertZext 0x4582710, ValueType:ch:i16

              0x45ca340: i32 = Constant<16>
            0x45ca3b0: i32 = mul 0x45ca570, 0x452f4c0
              0x45ca570: i32 = sra 0x4582010, Constant:i32<16>
                0x4582010: i32 = shl 0x45326d0, Constant:i32<16>
                  0x45326d0: i32,ch = load<LD4[%815]> 0x452ef10, 0x4531fd0, undef:i32


                  0x45ca340: i32 = Constant<16>
                0x45ca340: i32 = Constant<16>
              0x452f4c0: i32 = sra 0x4534cf0, Constant:i32<16>
                0x4534cf0: i32,ch = load<LD4[%812]> 0x452ef10, 0x45ca810, undef:i32
                  0x45ca810: i32 = add 0x4581ec0, Constant:i32<704>


                  0x452f840: i32 = undef
                0x45ca340: i32 = Constant<16>
          0x4535310: i32 = mul 0x45320b0, 0x4534cf0
            0x45320b0: i32 = sra 0x45327b0, Constant:i32<1>
              0x45327b0: i32 = add 0x452fa00, Constant:i32<1>
                0x452fa00: i32 = sra 0x45326d0, Constant:i32<15>
                  0x45326d0: i32,ch = load<LD4[%815]> 0x452ef10, 0x4531fd0, undef:i32


                  0x4535690: i32 = Constant<15>
                0x4531f60: i32 = Constant<1>
              0x4531f60: i32 = Constant<1>
            0x4534cf0: i32,ch = load<LD4[%812]> 0x452ef10, 0x45ca810, undef:i32
              0x45ca810: i32 = add 0x4581ec0, Constant:i32<704>
                0x4581ec0: i32 = add 0x4532040, 0x4537df0
                  0x4532040: i32 = add 0x45c9e70, 0x4538090


                  0x4537df0: i32 = shl 0x4581d70, Constant:i32<2>


                0x4531e80: i32 = Constant<704>
              0x452f840: i32 = undef
        0x45ca880: i32 = Constant<7>
      0x4531f60: i32 = Constant<1>
    0x4531f60: i32 = Constant<1>
  0x4535690: i32 = Constant<15>
In function: silk_noise_shape_quantizer_del_dec
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Android clang version 3.8.275480  (based on LLVM 3.8.275480)
Target: armv5te-none-linux-android
Thread model: posix
InstalledDir: /home/jeremy/Android/Sdk/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin
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.

(Android.mk based on https://github.com/xuan9/Opus-Android/blob/master/Android.mk)

Current workaround, use ndk r13b, which completes successfully.

[enh]

@pirama-arumuga-nainar ?

[pirama-arumuga-nainar]

I was able to reproduce the issue with the current Clang but it's fixed in Clang based on r285906, which should make it to the stable r15.

[DanAlbert]

@pirama-arumuga-nainar: let me know when the prebuilts are available

[DanAlbert]

New clang has been merged, so this should be good now (will be in r15 beta 2).