https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69124
--- Comment #3 from Sebastian Andrzej Siewior <gcc at breakpoint dot cc> --- gcc -v Target: arm-linux-gnueabihf Configured with: ../src/configure -v --with-pkgversion='Debian 5.3.1-4' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf Thread model: posix gcc version 5.3.1 20151219 (Debian 5.3.1-4) gcc -o fp_mul fp_mul_comba_32.c -g -O2 -march=armv7-a -mtune=cortex-a9 -mhard-float -mfpu=vfpv3-d16 gcc -o fp_mul-nt fp_mul_comba_32.c -g -O2 -march=armv7-a -mhard-float -mfpu=vfpv3-d16 (sid_armhf-dchroot)bigeasy@harris:~/tc$ ./fp_mul (sid_armhf-dchroot)bigeasy@harris:~/tc$ ./fp_mul-nt 27 0x0a7d8ff8 != 0xce804437 28 0x1c8a1f70 != 0x1c8a1f6f -> 3 So it does not trigger here with -mtune=cortex-a9 as well. Do you know what is selected for -mtune as default if it is not specified at build-time? I tried with cortex-a7 but it does not trigger :/
