AVX2 detection problem

[EricDeveaud]

Hello,

while running cmake for hyphy-2.5.63

I observe the following

-- Performing Test HAVE_AVX_EXTENSIONS
-- Performing Test HAVE_AVX_EXTENSIONS - Failed
-- Performing Test HAVE_SSE4_EXTENSIONS
-- Performing Test HAVE_SSE4_EXTENSIONS - Success

while lscpu claims that avx and avx2 are available on the host I'm building.
see

build [rpm]:tmp/build > lscpu
Architecture:         x86_64
CPU op-mode(s):       32-bit, 64-bit
Byte Order:           Little Endian
CPU(s):               128
On-line CPU(s) list:  0-63
Off-line CPU(s) list: 64-127
Thread(s) per core:   1
Core(s) per socket:   32
Socket(s):            2
NUMA node(s):         2
Vendor ID:            AuthenticAMD
CPU family:           23
Model:                49
Model name:           AMD EPYC 7452 32-Core Processor
Stepping:             0
CPU MHz:              2350.000
CPU max MHz:          2350.0000
CPU min MHz:          1500.0000
BogoMIPS:             4699.92
Virtualization:       AMD-V
L1d cache:            32K
L1i cache:            32K
L2 cache:             512K
L3 cache:             16384K
NUMA node0 CPU(s):    0-31
NUMA node1 CPU(s):    32-63
Flags:                fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr wbnoinvd amd_ppin arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sme sev sev_es

and gcc knnows how to handle it.

gcc -mavx2 -dM -E - < /dev/null | egrep "SSE|AVX" | sort
#define __AVX2__ 1
#define __AVX__ 1
#define __SSE2_MATH__ 1
#define __SSE2__ 1
#define __SSE3__ 1
#define __SSE4_1__ 1
#define __SSE4_2__ 1
#define __SSE_MATH__ 1
#define __SSE__ 1
#define __SSSE3__ 1

regards

Eric

[spond]

Dear @EricDeveaud,

Thanks for reporting. Our checks for AVX are based on the ability of gcc to successfully compile the following trivial bit of code (

hyphy/CMakeLists.txt

Line 95 in cc6eee3

check_cxx_source_runs("

)

 #include <immintrin.h>
      #include <stdio.h>

      int main ()
      {
          __m256d a, b;
          double vals[4] = {0.};
          a = _mm256_loadu2_m128d (vals, vals+2);
          b = _mm256_permute4x64_pd (_mm256_hadd_pd (a,a), 2);
          _mm256_storeu_pd (vals, b);
          printf (\"%g\", vals[0]);
          return (0);
      }

Presumably, this fails on your system. Would you be able to save the following code to a test.c file, try to compile it with gcc and see what the result/errors are? This may be informative.

Best,
Sergei