Lapack fixes (#667)

Author: adegomme

cmake/FindARMPL.cmake

@@ -18,7 +18,7 @@
 #===============================================================================
 
 include_guard()
-set(ARMPL_SEQ armpl_intp64)
+set(ARMPL_SEQ armpl_int64)
 set(ARMPL_OMP armpl_int64_mp)
 
 include(FindPackageHandleStandardArgs)

src/lapack/backends/armpl/armpl_common.hpp

@@ -142,7 +142,12 @@ inline constexpr bool is_complex<armpl_doublecomplex_t> = true;
 template <typename T>
 constexpr auto cast_to_int_if_complex(const T& alpha) {
     if constexpr (is_complex<T>) {
-        return static_cast<std::int64_t>((*((T*)&alpha)));
+        //armpl 25.04 uses directly std::complex so most of the ArmEquivalentType gymnastics is redundant
+        if constexpr (std::is_same_v<T, std::complex<float>> ||
+                      std::is_same_v<T, std::complex<double>>)
+            return static_cast<std::int64_t>(alpha.real());
+        else
+            return static_cast<std::int64_t>((*((T*)&alpha)));
     }
     else {
         return (std::int64_t)alpha;