ebiggers
commented
3 weeks ago This is working as intended. libdeflate expects that your binutils version is not significantly older than your gcc version. CentOS 7 comes with gcc 4.8, so it sounds like you upgraded to gcc 9.3 without upgrading binutils alongside it. You need to upgrade binutils too in order to have a complete upgraded toolchain. If you are using a common combination that I overlooked, e.g. the gcc and binutils that were shipped with a particular version of a distro, I can increase the gcc version that libdeflate checks for to cover that. But I can't work around arbitrary custom gcc + binutils combinations, considering that libdeflate's source code is buildable without a configuration step.
-no-avx512f only means "do not generate AVX512 code that isn't guarded by a runtime CPU feature check". libdeflate has optimized code guarded by runtime CPU feature checks, so that is why AVX512 code still appears in the binary. Note also that -no-avx512f is already the default. Likewise for -no-avx and -no-avx2.
I am encountering a persistent issue during the compilation of a project where the compiler seems to be ignoring directives to disable AVX, AVX2, and AVX-512 instructions. Despite specifying flags to prevent these instructions, the compiler attempts to use AVX-512 related instructions such as vpdpbusd, resulting in errors because these are not recognized by the assembler.
Environment:
Compiler: GCC 9.3.0 Operating System: Centos 7.9 CMake Version: 3.28.1
I configured the project with the following CMake command: cmake .. -DCMAKE_INSTALL_PREFIX=~/local/libdeflate -DCMAKE_C_FLAGS="-march=native -mno-avx -mno-avx2 -mno-avx512f"
- No build type selected; defaulting to Release -- The C compiler identification is GNU 9.3.0 -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working C compiler: /home/chongchuanlong/.local/gcc-9.3.0/bin/gcc - skipped -- Detecting C compile features -- Detecting C compile features - done -- Performing Test HAVE_WDECLARATION_AFTER_STATEMENT -- Performing Test HAVE_WDECLARATION_AFTER_STATEMENT - Success -- Performing Test HAVE_WIMPLICIT_FALLTHROUGH -- Performing Test HAVE_WIMPLICIT_FALLTHROUGH - Success -- Performing Test HAVE_WMISSING_FIELD_INITIALIZERS -- Performing Test HAVE_WMISSING_FIELD_INITIALIZERS - Success -- Performing Test HAVE_WMISSING_PROTOTYPES -- Performing Test HAVE_WMISSING_PROTOTYPES - Success -- Performing Test HAVE_WPEDANTIC -- Performing Test HAVE_WPEDANTIC - Success -- Performing Test HAVE_WSHADOW -- Performing Test HAVE_WSHADOW - Success -- Performing Test HAVE_WSTRICT_PROTOTYPES -- Performing Test HAVE_WSTRICT_PROTOTYPES - Success -- Performing Test HAVE_WUNDEF -- Performing Test HAVE_WUNDEF - Success -- Performing Test HAVE_WVLA -- Performing Test HAVE_WVLA - Success -- Looking for clock_gettime -- Looking for clock_gettime - found -- Looking for futimens -- Looking for futimens - found -- Looking for posix_fadvise -- Looking for posix_fadvise - found -- Looking for posix_madvise -- Looking for posix_madvise - found -- Performing Test HAVE_STAT_NANOSECOND_PRECISION -- Performing Test HAVE_STAT_NANOSECOND_PRECISION - Success -- Configuring done (1.6s) -- Generating done (0.0s)Then I ran make, which leads to the following errors:[ 3%] Building C object CMakeFiles/libdeflate_static.dir/lib/arm/cpu_features.c.o [ 6%] Building C object CMakeFiles/libdeflate_static.dir/lib/utils.c.o [ 10%] Building C object CMakeFiles/libdeflate_static.dir/lib/x86/cpu_features.c.o [ 13%] Building C object CMakeFiles/libdeflate_static.dir/lib/deflate_compress.c.o [ 17%] Building C object CMakeFiles/libdeflate_static.dir/lib/deflate_decompress.c.o [ 20%] Building C object CMakeFiles/libdeflate_static.dir/lib/adler32.c.o /tmp/cc00W0eO.s: Assembler messages: /tmp/cc00W0eO.s:644: Error: no such instruction:vpdpbusd %ymm17,%ymm2,%ymm6' /tmp/cc00W0eO.s:645: Error: no such instruction:vpdpbusd %ymm15,%ymm7,%ymm3' /tmp/cc00W0eO.s:647: Error: no such instruction:vpdpbusd %ymm14,%ymm2,%ymm6' /tmp/cc00W0eO.s:649: Error: no such instruction:vpdpbusd %ymm15,%ymm7,%ymm3' /tmp/cc00W0eO.s:650: Error: no such instruction:vpdpbusd %ymm14,%ymm2,%ymm6' /tmp/cc00W0eO.s:667: Error: no such instruction:vpdpbusd %ymm18,%ymm7,%ymm3' /tmp/cc00W0eO.s:668: Error: no such instruction:vpdpbusd %ymm1,%ymm7,%ymm6' /tmp/cc00W0eO.s:679: Error: no such instruction:vpdpbusd %ymm2,%ymm0,%ymm3' /tmp/cc00W0eO.s:680: Error: no such instruction:vpdpbusd %ymm1,%ymm0,%ymm6' /tmp/cc00W0eO.s:751: Error: no such instruction:vpdpbusd %ymm13,%ymm24,%ymm2' /tmp/cc00W0eO.s:752: Error: no such instruction:vpdpbusd %ymm13,%ymm23,%ymm1' /tmp/cc00W0eO.s:753: Error: no such instruction:vpdpbusd %ymm13,%ymm22,%ymm0' /tmp/cc00W0eO.s:754: Error: no such instruction:vpdpbusd %ymm13,%ymm21,%ymm11' /tmp/cc00W0eO.s:755: Error: no such instruction:vpdpbusd %ymm12,%ymm24,%ymm6' /tmp/cc00W0eO.s:756: Error: no such instruction:vpdpbusd %ymm12,%ymm23,%ymm5' /tmp/cc00W0eO.s:757: Error: no such instruction:vpdpbusd %ymm12,%ymm22,%ymm4' /tmp/cc00W0eO.s:758: Error: no such instruction:vpdpbusd %ymm12,%ymm21,%ymm3' /tmp/cc00W0eO.s:850: Error: no such instruction:vpdpbusd %zmm17,%zmm2,%zmm6' /tmp/cc00W0eO.s:851: Error: no such instruction:vpdpbusd %zmm15,%zmm7,%zmm3' /tmp/cc00W0eO.s:853: Error: no such instruction:vpdpbusd %zmm14,%zmm2,%zmm6' /tmp/cc00W0eO.s:855: Error: no such instruction:vpdpbusd %zmm15,%zmm7,%zmm3' /tmp/cc00W0eO.s:856: Error: no such instruction:vpdpbusd %zmm14,%zmm2,%zmm6' /tmp/cc00W0eO.s:873: Error: no such instruction:vpdpbusd %zmm18,%zmm7,%zmm3' /tmp/cc00W0eO.s:874: Error: no such instruction:vpdpbusd %zmm1,%zmm7,%zmm6' /tmp/cc00W0eO.s:885: Error: no such instruction:vpdpbusd %zmm2,%zmm0,%zmm3' /tmp/cc00W0eO.s:886: Error: no such instruction:vpdpbusd %zmm1,%zmm0,%zmm6' /tmp/cc00W0eO.s:961: Error: no such instruction:vpdpbusd %zmm13,%zmm24,%zmm2' /tmp/cc00W0eO.s:962: Error: no such instruction:vpdpbusd %zmm13,%zmm23,%zmm1' /tmp/cc00W0eO.s:963: Error: no such instruction:vpdpbusd %zmm13,%zmm22,%zmm0' /tmp/cc00W0eO.s:964: Error: no such instruction:vpdpbusd %zmm13,%zmm21,%zmm11' /tmp/cc00W0eO.s:965: Error: no such instruction:vpdpbusd %zmm12,%zmm24,%zmm6' /tmp/cc00W0eO.s:966: Error: no such instruction:vpdpbusd %zmm12,%zmm23,%zmm5' /tmp/cc00W0eO.s:967: Error: no such instruction:vpdpbusd %zmm12,%zmm22,%zmm4' /tmp/cc00W0eO.s:968: Error: no such instruction:vpdpbusd %zmm12,%zmm21,%zmm3' make[2]: *** [CMakeFiles/libdeflate_static.dir/lib/adler32.c.o] Error 1 make[1]: *** [CMakeFiles/libdeflate_static.dir/all] Error 2 make: *** [all] Error 2/tmp/cc00W0eO.s: Assembler messages: /tmp/cc00W0eO.s:644: Error: no such instruction: `vpdpbusd %ymm17,%ymm2,%ymm6' ... (additional errors) Despite the flags -mno-avx, -mno-avx2, and -mno-avx512f, the assembler output shows attempts to use vpdpbusd instructions, which should have been disabled. My machine supports SSE, AVX, and AVX2 instructions but does not support AVX-512.