[Clang][OpenMP][LoopTransformations] Implement "#pragma omp fuse" loop transformation directive and "looprange" clause (#139293)

This change implements the fuse directive, `#pragma omp fuse`, as specified in the OpenMP 6.0, along with the `looprange` clause in clang.

This change also adds minimal stubs so flang keeps compiling (a full implementation in flang of this directive is still pending).

---------

Co-authored-by: Roger Ferrer Ibanez <roger.ferrer@bsc.es>

1 files changed, 9 insertions, 2 deletions

diff --git a/clang/lib/Basic/OpenMPKinds.cpp b/clang/lib/Basic/OpenMPKinds.cpp
index 387026e..64b2bff 100644
--- a/clang/lib/Basic/OpenMPKinds.cpp
+++ b/clang/lib/Basic/OpenMPKinds.cpp
@@ -282,6 +282,7 @@ unsigned clang::getOpenMPSimpleClauseType(OpenMPClauseKind Kind, StringRef Str,
   case OMPC_affinity:
   case OMPC_when:
   case OMPC_append_args:
+  case OMPC_looprange:
     break;
   default:
     break;
@@ -627,6 +628,7 @@ const char *clang::getOpenMPSimpleClauseTypeName(OpenMPClauseKind Kind,
   case OMPC_affinity:
   case OMPC_when:
   case OMPC_append_args:
+  case OMPC_looprange:
     break;
   default:
     break;
@@ -755,9 +757,14 @@ bool clang::isOpenMPCanonicalLoopNestTransformationDirective(
          DKind == OMPD_interchange || DKind == OMPD_stripe;
 }
 
+bool clang::isOpenMPCanonicalLoopSequenceTransformationDirective(
+    OpenMPDirectiveKind DKind) {
+  return DKind == OMPD_fuse;
+}
+
 bool clang::isOpenMPLoopTransformationDirective(OpenMPDirectiveKind DKind) {
-  // FIXME: There will be more cases when we implement 'fuse'.
-  return isOpenMPCanonicalLoopNestTransformationDirective(DKind);
+  return isOpenMPCanonicalLoopNestTransformationDirective(DKind) ||
+         isOpenMPCanonicalLoopSequenceTransformationDirective(DKind);
 }
 
 bool clang::isOpenMPCombinedParallelADirective(OpenMPDirectiveKind DKind) {