Revert "Add restrict keyword to pointers (not sharing the same memory for multiple fields)"

This reverts commit 60b70bb332.

It appears to have minimal performance impact, and fails to compile on
nvidia cards.

.gitignore

@@ -1,5 +1,9 @@
 .idea/
-__pycache__
 *.h5
-*.pyc
+
+__pycache__
+*.py[cod]
+build/
+dist/
+*.egg-info/
 

opencl_fdtd/kernels/common.cl

@@ -2,7 +2,7 @@
 /* Common code for E, H updates
  *
  * Template parameters:
- *  ftype	type name (e.g. float or double)
+ *  ftype       type name (e.g. float or double)
  *  shape       list of 3 ints specifying shape of fields
  */
 #}
@@ -78,7 +78,8 @@ int p{{r}} = + (int) di{{r}};
 int wrap_{{r}} = (s{{r}} - 1) * (int) di{{r}};
 if ( {{r}} == 0 ) {
   m{{r}} = wrap_{{r}};
-} else if ( {{r}} == s{{r}} - 1 ) {
+}
+if ( {{r}} == s{{r}} - 1 ) {
   p{{r}} = -wrap_{{r}};
 }
 {% endfor %}

opencl_fdtd/simulation.py

@@ -170,7 +170,7 @@ class Simulation(object):
         ctype = type_to_C(self.arg_type)
 
         def ptr(arg: str) -> str:
-            return ctype + ' * restrict ' + arg
+            return ctype + ' *' + arg
 
         base_fields = OrderedDict()
         base_fields[ptr('E')] = self.E
@@ -286,13 +286,13 @@ class Simulation(object):
             alpha_max = pml['cfs_alpha']
 
             def par(x):
-                scaling = ((x / (pml['thickness'])) ** pml['m'])
+                scaling = (x / pml['thickness']) ** pml['m']
                 sigma = scaling * sigma_max
                 kappa = 1 + scaling * (kappa_max - 1)
                 alpha = ((1 - x / pml['thickness']) ** pml['ma']) * alpha_max
                 p0 = numpy.exp(-(sigma / kappa + alpha) * self.dt)
                 p1 = sigma / (sigma + kappa * alpha) * (p0 - 1)
-                p2 = 1/kappa
+                p2 = 1 / kappa
                 return p0, p1, p2
 
             xe, xh = (numpy.arange(1, pml['thickness'] + 1, dtype=self.arg_type)[::-1] for _ in range(2))