compiler options

gistfile1.txt

--- c6i.2xl, gcc

g++  -fno-rtti   -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wunused-parameter -I. -I./include -std=c++17  -faligned-new -DHAVE_ALIGNED_NEW -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX  -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=1 -DZLIB -DLZ4 -DZSTD -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_AUXV_GETAUXVAL_PRESENT -march=native   -DHAVE_SSE42  -DHAVE_PCLMUL  -DHAVE_AVX2  -DHAVE_BMI  -DHAVE_LZCNT -DHAVE_UINT128_EXTENSION -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE  -isystem third-party/gtest-1.8.1/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -DNDEBUG -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-invalid-offsetof -c util/crc32c.cc -o util/crc32c.o

--- c6i.2xl, clang
clang++  -fno-rtti   -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wunused-parameter -I. -I./include -std=c++17  -faligned-new -DHAVE_ALIGNED_NEW -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX  -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=1 -DZLIB -DLZ4 -DZSTD -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_AUXV_GETAUXVAL_PRESENT -march=native   -DHAVE_SSE42  -DHAVE_PCLMUL  -DHAVE_AVX2  -DHAVE_BMI  -DHAVE_LZCNT -DHAVE_UINT128_EXTENSION -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE  -isystem third-party/gtest-1.8.1/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -DNDEBUG -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-invalid-offsetof -c util/crc32c.cc -o util/crc32c.o

--- c7g.2xl, gcc

g++  -fno-rtti   -march=armv8-a+crc+crypto -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wunused-parameter -I. -I./include -std=c++17  -faligned-new -DHAVE_ALIGNED_NEW -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX  -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=1 -DZLIB -DLZ4 -DZSTD -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_AUXV_GETAUXVAL_PRESENT -DHAVE_UINT128_EXTENSION -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE  -isystem third-party/gtest-1.8.1/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -DNDEBUG -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-invalid-offsetof -c util/crc32c_arm64.cc -o util/crc32c_arm64.o

--- c7g.2xl, clang

clang++  -fno-rtti   -march=armv8-a+crc+crypto -g -W -Wextra -Wall -Wsign-compare -Wshadow -Wunused-parameter -I. -I./include -std=c++17  -faligned-new -DHAVE_ALIGNED_NEW -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX  -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=1 -DZLIB -DLZ4 -DZSTD -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_AUXV_GETAUXVAL_PRESENT -DHAVE_UINT128_EXTENSION -DROCKSDB_JEMALLOC -DJEMALLOC_NO_DEMANGLE  -isystem third-party/gtest-1.8.1/fused-src -O2 -fno-omit-frame-pointer -momit-leaf-frame-pointer -DNDEBUG -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-invalid-offsetof -c util/crc32c_arm64.cc -o util/crc32c_arm64.o

--- diff for c6i.2xl, gcc vs clang

$ diff o.g.s o.c.s
62c62
< g++
---
> clang++

--- diff for c7g.2xl, gcc vs clang

$ diff o.g.s o.c.s
7d6
<
52c51
< g++
---
> clang++

--- diff for gcc : c6i.2xl vs c7g.2xl

15,19d8
< -DHAVE_AVX2
< -DHAVE_BMI
< -DHAVE_LZCNT
< -DHAVE_PCLMUL
< -DHAVE_SSE42
58c47
< -march=native
---
> -march=armv8-a+crc+crypto

--- diff for clang : c6i.2xl vs c7g.2xl

15,19d8
< -DHAVE_AVX2
< -DHAVE_BMI
< -DHAVE_LZCNT
< -DHAVE_PCLMUL
< -DHAVE_SSE42
58c47
< -march=native
---
> -march=armv8-a+crc+crypto