Cache now compares cl_context instead of a pointer to a context; added verbose print statements to the cache

CHANGELOG

@@ -4,6 +4,7 @@ Development version (next release)
 - Fixed proper MSVC dllimport and dllexport declarations
 - Fixed memory leaks related to events not being released
 - Fixed a bug with a size_t and cl_ulong mismatch on 32-bit systems
+- Fixed a bug related to the cache and retrieval of programs based on the OpenCL context
 - Added an option (-warm_up) to do a warm-up run before timing in the performance clients
 - Added tuned parameters for various devices (see README)
 

src/cache.cpp

@@ -23,6 +23,9 @@ namespace clblast {
 // Stores the compiled binary or IR in the cache
 void StoreBinaryToCache(const std::string &binary, const std::string &device_name,
                         const Precision &precision, const std::string &routine_name) {
+  #ifdef VERBOSE
+    printf("[DEBUG] Storing binary in cache\n");
+  #endif
   binary_cache_mutex_.lock();
   binary_cache_.push_back(BinaryCache{binary, device_name, precision, routine_name});
   binary_cache_mutex_.unlock();
@@ -31,6 +34,9 @@ void StoreBinaryToCache(const std::string &binary, const std::string &device_nam
 // Stores the compiled program in the cache
 void StoreProgramToCache(const Program &program, const Context &context,
                          const Precision &precision, const std::string &routine_name) {
+  #ifdef VERBOSE
+    printf("[DEBUG] Storing program in cache\n");
+  #endif
   program_cache_mutex_.lock();
   program_cache_.push_back(ProgramCache{program, context.pointer(), precision, routine_name});
   program_cache_mutex_.unlock();
@@ -40,6 +46,9 @@ void StoreProgramToCache(const Program &program, const Context &context,
 // otherwise.
 const std::string& GetBinaryFromCache(const std::string &device_name, const Precision &precision,
                                       const std::string &routine_name) {
+  #ifdef VERBOSE
+    printf("[DEBUG] Retrieving binary from cache\n");
+  #endif
   binary_cache_mutex_.lock();
   for (auto &cached_binary: binary_cache_) {
     if (cached_binary.MatchInCache(device_name, precision, routine_name)) {
@@ -55,6 +64,9 @@ const std::string& GetBinaryFromCache(const std::string &device_name, const Prec
 // otherwise.
 const Program& GetProgramFromCache(const Context &context, const Precision &precision,
                                    const std::string &routine_name) {
+  #ifdef VERBOSE
+    printf("[DEBUG] Retrieving program from cache\n");
+  #endif
   program_cache_mutex_.lock();
   for (auto &cached_program: program_cache_) {
     if (cached_program.MatchInCache(context.pointer(), precision, routine_name)) {

src/cache.hpp

@@ -55,7 +55,7 @@ struct ProgramCache {
   // Finds out whether the properties match
   bool MatchInCache(const ContextPointer ref_context, const Precision &ref_precision,
                     const std::string &ref_routine) {
-    return (context_ptr == ref_context &&
+    return (*context_ptr == *ref_context &&
             precision == ref_precision &&
             routine_name_ == ref_routine);
   }