Compile mixed precision code only if AVX2 is supported.

For this we remove the GCC pragmas and set the needed compiler flag
when available.

CMakeLists.txt

@@ -756,11 +756,6 @@ if(HAVE_AVX2_EXTENSION)
 endif()
 
 # must link libraries after target 'opmsimulators' has been defined
-
-if(HAVE_AVX2_EXTENSIONS)
-  target_compile_options(opmsimulators
-    ${AVX2_FLAGS})
-endif()
 if(CUDA_FOUND)
   if (NOT USE_HIP)
     target_link_libraries(opmsimulators

opm/simulators/linalg/mixed/bslv.c

@@ -6,8 +6,6 @@
 #include <stdlib.h>
 #include <assert.h>
 
-#pragma GCC push_options
-#pragma GCC target("avx2")
 
 bslv_memory *bslv_alloc()
 {
@@ -239,7 +237,7 @@ int bslv_pbicgstab3d(bslv_memory *mem, bsr_matrix *A, const double *b, double *x
 }
 
 
-#pragma GCC pop_options
+
 
 
 

opm/simulators/linalg/mixed/bsr.c

@@ -7,8 +7,6 @@
 
 #include <immintrin.h>
 
-#pragma GCC push_options
-#pragma GCC target("avx2")
 
 bsr_matrix* bsr_alloc()
 {
@@ -206,5 +204,3 @@ void bsr_nonzeros(bsr_matrix *A, const char *name)
     printf("]\n");
 }
 
-#pragma GCC pop_options
-

opm/simulators/linalg/mixed/prec.c

@@ -4,9 +4,6 @@
 #include <assert.h>
 #include <immintrin.h>
 
-#pragma GCC push_options
-#pragma GCC target("avx2")
-
 
 prec_t *prec_alloc()
 {
@@ -628,4 +625,3 @@ void prec_info(prec_t *P)
     bsr_info(P->D);
     bsr_info(P->U);
 }
-#pragma GCC pop_options