root@macchiatobin:~/src/benchs# uname -a Linux macchiatobin 5.9.11-matteo #4 SMP Sat Dec 5 18:23:22 CET 2020 aarch64 GNU/Linux root@macchiatobin:~/src/benchs# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/10/lto-wrapper Target: aarch64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.0-23' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-mutex Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.2.0 (Debian 10.2.0-23) root@macchiatobin:~/src/benchs# clang -v Debian clang version 11.0.0-5+b1 Target: aarch64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/bin Found candidate GCC installation: /usr/bin/../lib/gcc/aarch64-linux-gnu/10 Found candidate GCC installation: /usr/lib/gcc/aarch64-linux-gnu/10 Selected GCC installation: /usr/bin/../lib/gcc/aarch64-linux-gnu/10 Candidate multilib: .;@m64 Selected multilib: .;@m64 root@macchiatobin:~/src/benchs# make run CC=gcc gcc -pipe -O3 -Wall -mcpu=cortex-a72 -c -o dry.o dry.c gcc -pipe -O3 -Wall -mcpu=cortex-a72 -c -o dry2.o dry2.c gcc dry.o dry2.o -o dry gcc -pipe -O3 -Wall -mcpu=cortex-a72 flops.c -o flops ./dry 2>/dev/null Dhrystone Benchmark, Version C, Version 2.3 Program compiled without 'register' attribute Using clock_gettime(), HZ=1000 Running 1 thread(s) Microseconds for one run through Dhrystone: 0.0 Dhrystones per Second: 20193860 ./flops FLOPS C Program (Double Precision), V2.0 18 Dec 1992 Module Error RunTime MFLOPS (usec) 1 4.0146e-13 0.0080 1749.5981 2 -1.4166e-13 0.0061 1142.5963 3 4.7184e-14 0.0074 2287.9728 4 -1.2546e-13 0.0079 1895.2186 5 -1.3800e-13 0.0147 1968.2602 6 3.2374e-13 0.0128 2270.7440 7 -8.4583e-11 0.0240 499.8896 8 3.4855e-13 0.0143 2096.9716 Iterations = 512000000 NullTime (usec) = 0.0000 MFLOPS(1) = 1366.1866 MFLOPS(2) = 1034.9090 MFLOPS(3) = 1637.4457 MFLOPS(4) = 2145.0981 root@macchiatobin:~/src/benchs# make run CC=clang clang -pipe -O3 -Wall -mcpu=cortex-a72 -c -o dry.o dry.c clang -pipe -O3 -Wall -mcpu=cortex-a72 -c -o dry2.o dry2.c clang dry.o dry2.o -o dry clang -pipe -O3 -Wall -mcpu=cortex-a72 flops.c -o flops ./dry 2>/dev/null Dhrystone Benchmark, Version C, Version 2.3 Program compiled without 'register' attribute Using clock_gettime(), HZ=1000 Running 1 thread(s) Microseconds for one run through Dhrystone: 0.1 Dhrystones per Second: 15028554 ./flops FLOPS C Program (Double Precision), V2.0 18 Dec 1992 Module Error RunTime MFLOPS (usec) 1 4.0146e-13 0.0080 1749.5972 2 -1.4166e-13 0.0065 1076.6778 3 4.7184e-14 0.0132 1289.9074 4 -1.2557e-13 0.0130 1152.0730 5 -1.3800e-13 0.0230 1262.6973 6 3.2380e-13 0.0207 1400.6490 7 -8.4583e-11 0.0240 499.8874 8 3.4867e-13 0.0220 1363.6914 Iterations = 512000000 NullTime (usec) = 0.0000 MFLOPS(1) = 1138.1883 MFLOPS(2) = 874.0951 MFLOPS(3) = 1178.5884 MFLOPS(4) = 1320.6963