reenable the automatic detection of when to don't load the full kernel for the…

theano/sandbox/cuda/blas.py

@@ -363,7 +363,7 @@ class GpuConv(Op):
         return ['cuda_ndarray.cuh','<stdio.h>']
 
     def c_code_cache_version(self):
-        return (0,10) # raise this whenever modifying any of the support_code_files
+        return (0,11) # raise this whenever modifying any of the support_code_files
 
     def c_support_code_apply(self, node, nodename):
         # REMEMBER TO RAISE c_code_cache_version when changing any of these files

theano/sandbox/cuda/conv.cu

@@ -449,6 +449,11 @@ CudaNdarray_conv_valid(const CudaNdarray *img, const CudaNdarray * kern,
 	if(version==8||version==13) nb_split++;//force the split.
 	if(version==13)full_kern=false;
 
+	//check if we can fit the full kernel in the shared memory
+	if(sizeof(float)*std::max(img_size + kern_size, out_size*2) > shared_avail){
+	  full_kern = false;
+	}
+
         //thread_z is going to be ceil_intdiv(kern_len, nb_split)
         // we need enough splits so that
         // a) thread_z fits in the 'z' threadIdx (i.e. is less than 64)