rename approximateFootprint to approximateScopedAccesses

Commit a106e7e (TensorReferenceGroup::approximateFootprint: return
relative footprint, Wed Jun 13 15:49:43 2018 +0200) changed
approximateFootprint to return a relative footprint without modifying
its name.  Use a name that is more similar to other TensorReferenceGroup
methods that return a relative footprint.

Author: Sven Verdoolaege

tc/core/polyhedral/memory_promotion.cc

@@ -115,7 +115,7 @@ std::unique_ptr<TensorReferenceGroup> TensorReferenceGroup::makeSingleton(
   return group;
 }
 
-isl::map TensorReferenceGroup::approximateFootprint() const {
+isl::map TensorReferenceGroup::approximateScopedAccesses() const {
   auto scopedDomain = scopedAccesses().domain();
   auto space = approximation.box.get_space();
   auto accessed = isl::map::universe(space).intersect_domain(scopedDomain);
@@ -271,8 +271,8 @@ void joinOverlappingWrites(
       if (g1->isReadOnly() && g2->isReadOnly()) {
         continue;
       }
-      if (g1->approximateFootprint()
-              .intersect(g2->approximateFootprint())
+      if (g1->approximateScopedAccesses()
+              .intersect(g2->approximateScopedAccesses())
               .is_empty()) {
         continue;
       }
@@ -518,7 +518,7 @@ ScheduleTree* insertCopiesUnder(
   auto arrayId =
       promotionSpace.domain().unwrap().get_tuple_id(isl::dim_type::out);
   auto approximatedRead =
-      group.approximateFootprint().intersect_range(tensorElements).wrap();
+      group.approximateScopedAccesses().intersect_range(tensorElements).wrap();
   approximatedRead = approximatedRead.product(promotedFootprint);
   auto readExtension = extension.intersect_range(approximatedRead)
                            .set_tuple_id(isl::dim_type::out, readId);

tc/core/polyhedral/memory_promotion.h

@@ -143,7 +143,7 @@ class TensorReferenceGroup {
 
   // Rectangular overapproximation of the set of tensor elements accessed below
   // and relative to the scoping point.
-  isl::map approximateFootprint() const;
+  isl::map approximateScopedAccesses() const;
 
   isl::multi_aff promotion() const;
   isl::set promotedFootprint() const;

test/test_cuda_mapper_memory_promotion.cc

@@ -305,7 +305,7 @@ def fun(float(N, M) A, float(N, M) B) -> (C) {
       EXPECT_EQ(
           oneGroup->approximation.size(1),
           isl::val(ctx, std::min(tile2, problemSize2)));
-      auto footprint = tileZero.apply(oneGroup->approximateFootprint());
+      auto footprint = tileZero.apply(oneGroup->approximateScopedAccesses());
       size_t np = npoints(footprint);
       EXPECT_EQ(
           np, std::min(tile1, problemSize1) * std::min(tile2, problemSize2));