Add a check for 512 bits generated code.

Improve the tester.

Signed-off-by: George Bosilca <[email protected]>

Author: bosilca

ompi/mca/op/avx/configure.m4

@@ -63,6 +63,26 @@ AC_DEFUN([MCA_ompi_op_avx_CONFIG],[
                   CFLAGS="$op_avx_cflags_save"
                  ])
            #
+           # Some combination of gcc and older as would not correctly build the code generated by
+           # _mm256_loadu_si256. Screen them out.
+           #
+           AS_IF([test $op_avx512_support -eq 1],
+                 [AC_MSG_CHECKING([if _mm512_loadu_si512 generates code that can be compiled])
+                  op_avx_cflags_save="$CFLAGS"
+                  CFLAGS="$CFLAGS_WITHOUT_OPTFLAGS -O0 $MCA_BUILD_OP_AVX512_FLAGS"
+                  AC_LINK_IFELSE(
+                      [AC_LANG_PROGRAM([[#include <immintrin.h>]],
+                               [[
+    int A[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
+    __m512i vA = _mm512_loadu_si512((__m512i*)&(A[1]))
+                               ]])],
+                      [AC_MSG_RESULT([yes])],
+                      [op_avx512_support=0
+                       MCA_BUILD_OP_AVX512_FLAGS=""
+                       AC_MSG_RESULT([no])])
+                  CFLAGS="$op_avx_cflags_save"
+                 ])
+           #
            # Check support for AVX2
            #
            AC_MSG_CHECKING([for AVX2 support (no additional flags)])

test/datatype/check_op.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -u
+
 echo "ompi version with AVX512 -- Usage: arg1: count of elements, args2: 'i'|'u'|'f'|'d' : datatype: signed, unsigned, float, double. args3 size of type. args4 operation"
 echo "mpirun -mca op_sve_hardware_available 0 -mca op_avx_hardware_available 0 -np 1 Reduce_local_float 1048576  i 8 max"