This is kind of weird, but I think there's a disconnect in my understanding of things. CRC can be enabled with the following: $ gcc -g3 -O0 -march=armv8-a+crc -mfpu=neon test.cc -o test.exe $ However, the Crypto stuff fails to compile: $ gcc -g3 -O0 -march=armv8-a+crc+crypto -mfpu=neon test.cc -o test.exe gcc: error: unrecognized argument in option ‘-march=armv8-a+crc+crypto’ So the question becomes, how do I enable the Crypto extensions? Jeff On Wed, Jul 27, 2016 at 1:10 AM, Jeffrey Walton <noloader@xxxxxxxxx> wrote: > I have a Raspberry Pi 3, which is ARMv8. It has CRC, but it lacks > PMULL, AES and SHA. Its also running a Debian-lite/4.4 kernel/ARMHF > image. GCC version is 'g++ (Raspbian 4.9.2-10) 4.9.2'. > > From cpuinfo, I believe the following is mostly optimal, but it fails > to crc32 extensions: > > -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard > > According to GCC's ARM options page > (http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html), CRC requires > -march=armv8-a+crc (or something similar). > > My question is, how do I enable crc32 extensions in this configuration? > > Thanks in advance. > > Jeff > > ********** > > # cat /proc/cpuinfo > processor : 0 > model name : ARMv7 Processor rev 4 (v7l) > BogoMIPS : 76.80 > Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva > idivt vfpd32 lpae evtstrm crc32 > CPU implementer : 0x41 > CPU architecture: 7 > CPU variant : 0x0 > CPU part : 0xd03 > CPU revision : 4 > ... > > ********** > > $ g++ -march=native -dM -E - </dev/null > *** Error in `g++': double free or corruption (top): 0x018ead68 *** > Aborted > > $ g++ -mtune=native -dM -E - </dev/null > *** Error in `g++': double free or corruption (top): 0x00278e00 *** > Aborted > > $ g++ -dM -E - </dev/null | sort | egrep -i > '(arm|aarch|crc|crypto|neon|feature)' > #define __arm__ 1 > #define __ARM_32BIT_STATE 1 > #define __ARM_ARCH 6 > #define __ARM_ARCH_6__ 1 > #define __ARM_ARCH_ISA_ARM 1 > #define __ARM_ARCH_ISA_THUMB 1 > #define __ARM_EABI__ 1 > #define __ARMEL__ 1 > #define __ARM_FEATURE_CLZ 1 > #define __ARM_FEATURE_DSP 1 > #define __ARM_FEATURE_LDREX 4 > #define __ARM_FEATURE_QBIT 1 > #define __ARM_FEATURE_SAT 1 > #define __ARM_FEATURE_SIMD32 1 > #define __ARM_FEATURE_UNALIGNED 1 > #define __ARM_FP 12 > #define __ARM_NEON_FP 4 > #define __ARM_PCS_VFP 1 > #define __ARM_SIZEOF_MINIMAL_ENUM 4 > #define __ARM_SIZEOF_WCHAR_T 32 > > $ clang++-3.7 -dM -E - </dev/null | sort | egrep -i > '(arm|aarch|crc|crypto|neon|feature)' > #define __arm 1 > #define __arm__ 1 > #define __ARM_32BIT_STATE 1 > #define __ARM_ACLE 200 > #define __ARM_ARCH 6 > #define __ARM_ARCH_6K__ 1 > #define __ARM_ARCH_ISA_ARM 1 > #define __ARM_EABI__ 1 > #define __ARMEL__ 1 > #define __ARM_FEATURE_DSP 1 > #define __ARM_FP 0xC > #define __ARM_PCS 1 > #define __ARM_PCS_VFP 1 > #define __ARM_SIZEOF_MINIMAL_ENUM 4 > #define __ARM_SIZEOF_WCHAR_T 4 > #define __ARM_VFPV2__ 1
