I have a CPP file which fails to compile with any optimization other than -O0. The output is " error: insn does not satisfy its constraints:" and "internal compiler error: in reload_cse_simplify_operands, at postreload.c:411". Setting to -O3 causes the error. Should I file this as a bug? -------------------------------------------------------------- The output of `arm-none-eabi-g++ -v` is : Using built-in specs. COLLECT_GCC=arm-none-eabi-g++ COLLECT_LTO_WRAPPER=/usr/local/gcc-arm-none-eabi-4_9-2015q3/bin/../lib/gcc/arm-none-eabi/4.9.3/lto-wrapper Target: arm-none-eabi Configured with: /home/build/work/GCC-4-9-build/src/gcc/configure --target=arm-none-eabi --prefix=/home/build/work/GCC-4-9-build/install-native --libexecdir=/home/build/work/GCC-4-9-build/install-native/lib --infodir=/home/build/work/GCC-4-9-build/install-native/share/doc/gcc-arm-none-eabi/info --mandir=/home/build/work/GCC-4-9-build/install-native/share/doc/gcc-arm-none-eabi/man --htmldir=/home/build/work/GCC-4-9-build/install-native/share/doc/gcc-arm-none-eabi/html --pdfdir=/home/build/work/GCC-4-9-build/install-native/share/doc/gcc-arm-none-eabi/pdf --enable-languages=c,c++ --enable-plugins --disable-decimal-float --disable-libffi --disable-libgomp --disable-libmudflap --disable-libquadmath --disable-libssp --disable-libstdcxx-pch --disable-nls --disable-shared --disable-threads --disable-tls --with-gnu-as --with-gnu-ld --with-newlib --with-headers=yes --with-python-dir=share/gcc-arm-none-eabi --with-sysroot=/home/build/work/GCC-4-9-build/install-native/arm-none-eabi --build=i686-linux-gnu --host=i686-linux-gnu --with-gmp=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-mpfr=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-mpc=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-isl=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-cloog=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-libelf=/home/build/work/GCC-4-9-build/build-native/host-libs/usr --with-host-libstdcxx='-static-libgcc -Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --with-pkgversion='GNU Tools for ARM Embedded Processors' --with-multilib-list=armv6-m,armv7-m,armv7e-m,cortex-m7,armv7-r Thread model: single gcc version 4.9.3 20150529 (release) [ARM/embedded-4_9-branch revision 227977] (GNU Tools for ARM Embedded Processors) -------------------------------------------------------------- The command I'm using to compile is: arm-none-eabi-g++ -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -std=c++0x -DSTM32F405RGTx -DSTM32F4 -DSTM32 -DDEBUG -Dnullptr=0U -DVS_LOGGING_LEVEL=10 -O2 -g3 -Wall -Wextra -fmessage-length=0 -ffunction-sections -c -fno-exceptions -mslow-flash-data -fno-rtti -save-temps f.cpp -------------------------------------------------------------- The code is below: #include #include #include enum MatrixLayout { ROW_MAJOR, COLUMN_MAJOR }; namespace MathErrors { enum Error { SUCCESS = 0, ARGUMENT_ERROR, }; } struct rectangular_tag {}; struct squared_tag : public rectangular_tag {}; template struct MatrixTrait { typedef rectangular_tag shape_category; }; template struct MatrixTrait { typedef squared_tag shape_category; }; class Indexing { public: Indexing(MatrixLayout layout, int lda) : _rowFactor(layout == ROW_MAJOR ? lda : 1), _colFactor(layout == ROW_MAJOR ? 1 : lda) {} inline int operator()(int i, int j) { return i * _rowFactor + j * _colFactor; } private: int _rowFactor; int _colFactor; }; MathErrors::Error Potrf (MatrixLayout matrix_layout, int n, const float * __restrict__ A, squared_tag, int lda, float * __restrict__ L, squared_tag, int ldl) { Indexing indA(matrix_layout, lda); Indexing indL(matrix_layout, ldl); bool isspd = true; // Main loop. for (int j = 0; j < n; j++) { float d(0.0); for (int k = 0; k < j; k++) { float s(0.0); for (int i = 0; i < k; i++) { s += L[indL(k,i)]*L[indL(j,i)]; } L[indL(j,k)] = s = (A[indA(j,k)] - s)/L[indL(k,k)]; d = d + s*s; isspd = isspd && (A[indA(k,j)] == A[indA(j,k)]); } d = A[indA(j,j)] - d; isspd = isspd && (d > 0.); L[indL(j,j)] = std::sqrt(d > 0. ? d : 0.); for (int k = j+1; k < n; k++) { L[indL(j,k)] = 0.; } } if(isspd) { return MathErrors::SUCCESS; } else { return MathErrors::ARGUMENT_ERROR; } } -------------------------------------------------------------- The complete error is: f.cpp: In function 'MathErrors::Error Potrf(MatrixLayout, int, const float*, squared_tag, int, float*, squared_tag, int)': f.cpp:91:1: error: insn does not satisfy its constraints: } ^ (insn 255 258 502 27 (set (reg:SF 31 s15 [326]) (const_double:SF 0.0 [0x0.0p+0])) f.cpp:81 609 {*thumb2_movsf_vfp} (nil)) f.cpp:91:1: internal compiler error: in reload_cse_simplify_operands, at postreload.c:411 Please submit a full bug report,

GNU Arm Embedded Toolchain

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