[SYCL][FPGA] Remove deprecation message for intel::disable_loop_pipelining attribute (#6404)

#6254 added the fpga_pipeline attribute and
deprecated the intel::disable_loop_pipelining attribute.
While this was in the pipeline, the internal decision was made to switch to properties
rather than attributes for this type of thing.

At this point, internal request is that (at a minimum) the deprecation message for
intel::disable_loop_pipelining be removed, as we no longer plan to deprecate it.
Optionally the intel::fpga_pipeline attribute can be removed from the frontend as well.

Signed-off-by: Soumi Manna <soumi.manna@intel.com>

Author: smanna12

clang/include/clang/Basic/AttrDocs.td

@@ -3294,9 +3294,6 @@ function, or in conjunction with ``max_interleaving``,
 ``speculated_iterations``, ``max_concurrency``, ``initiation_interval``,
 or ``ivdep``.
 
-The ``[[intel::disable_loop_pipelining]]`` attribute spelling is a deprecated
-synonym for ``[[[intel::fpga_pipeline]]`` and will be removed in the future.
-
 .. code-block:: c++
 
   void foo() {

clang/lib/Sema/SemaDeclAttr.cpp

@@ -364,14 +364,6 @@ void Sema::CheckDeprecatedSYCLAttributeSpelling(const ParsedAttr &A,
     Diag(A.getLoc(), diag::ext_sycl_2020_attr_spelling) << A;
     return;
   }
-
-  // Deprecate [[intel::disable_loop_pipelining]] attribute spelling in favor
-  // of the SYCL FPGA attribute spelling [[intel::fpga_pipeline]].
-  if (A.hasScope() && A.getScopeName()->isStr("intel") &&
-      A.getAttrName()->isStr("disable_loop_pipelining")) {
-    DiagnoseDeprecatedAttribute(A, "intel", "fpga_pipeline");
-    return;
-  }
 }
 
 /// Check if IdxExpr is a valid parameter index for a function or

clang/test/SemaSYCL/intel-fpga-loops.cpp

@@ -134,6 +134,9 @@ void boo() {
 void goo() {
   int a[10];
   // no diagnostics are expected
+  [[intel::disable_loop_pipelining]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // no diagnostics are expected
   [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
   // no diagnostics are expected
@@ -269,6 +272,10 @@ void zoo() {
   [[intel::max_concurrency(2)]]
   [[intel::initiation_interval(2)]] for (int i = 0; i != 10; ++i)
       a[i] = 0;
+  [[intel::disable_loop_pipelining]]
+  // expected-error@+1 {{duplicate Intel FPGA loop attribute 'disable_loop_pipelining'}}
+  [[intel::disable_loop_pipelining]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
   [[intel::fpga_pipeline]]
   // expected-error@+1 {{duplicate Intel FPGA loop attribute 'fpga_pipeline'}}
   [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
@@ -355,23 +362,52 @@ void zoo() {
 // Test for Intel FPGA loop attributes compatibility
 void loop_attrs_compatibility() {
   int a[10];
+  // no diagnostics are expected
+  [[intel::disable_loop_pipelining]] [[intel::loop_coalesce]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // no diagnostics are expected
   [[intel::fpga_pipeline]] [[intel::loop_coalesce]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
-  // expected-error@+4 {{'max_interleaving' and 'disable_loop_pipelining' attributes are not compatible}}
+  // expected-error@+2 {{'max_interleaving' and 'disable_loop_pipelining' attributes are not compatible}}
   // expected-note@+1 {{conflicting attribute is here}}
-  [[intel::disable_loop_pipelining]] // expected-warning {{attribute 'intel::disable_loop_pipelining' is deprecated}} \
-                                     // expected-note {{did you mean to use 'intel::fpga_pipeline' instead?}}
-  [[intel::max_interleaving(0)]] for (int i = 0; i != 10; ++i)
+  [[intel::disable_loop_pipelining]] [[intel::max_interleaving(0)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // expected-error@+2 {{'max_concurrency' and 'disable_loop_pipelining' attributes are not compatible}}
+  // expected-note@+1 {{conflicting attribute is here}}
+  [[intel::disable_loop_pipelining]] [[intel::max_concurrency(0)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // expected-error@+2 {{'disable_loop_pipelining' and 'speculated_iterations' attributes are not compatible}}
+  // expected-note@+1 {{conflicting attribute is here}}
+  [[intel::speculated_iterations(0)]] [[intel::disable_loop_pipelining]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
-
   // expected-error@+2 {{'fpga_pipeline' and 'speculated_iterations' attributes are not compatible}}
   // expected-note@+1 {{conflicting attribute is here}}
   [[intel::speculated_iterations(0)]] [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
+  // expected-error@+2 {{'disable_loop_pipelining' and 'initiation_interval' attributes are not compatible}}
+  // expected-note@+1 {{conflicting attribute is here}}
+  [[intel::initiation_interval(10)]] [[intel::disable_loop_pipelining]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // expected-error@+2 {{'ivdep' and 'disable_loop_pipelining' attributes are not compatible}}
+  // expected-note@+1 {{conflicting attribute is here}}
+  [[intel::disable_loop_pipelining]] [[intel::ivdep]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
   // expected-error@+2 {{'fpga_pipeline' and 'initiation_interval' attributes are not compatible}}
   // expected-note@+1 {{conflicting attribute is here}}
   [[intel::initiation_interval(10)]] [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
+  // no diagnostics are expected
+  [[intel::disable_loop_pipelining]] [[intel::nofusion]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  // no diagnostics are expected
+  [[intel::disable_loop_pipelining]] [[intel::loop_count_avg(8)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  [[intel::loop_count_min(8)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  [[intel::loop_count_max(8)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
+  [[intel::loop_count(8)]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
 
   // no diagnostics are expected
   [[intel::fpga_pipeline]] [[intel::loop_coalesce]] for (int i = 0; i != 10; ++i)
@@ -406,6 +442,10 @@ void loop_attrs_compatibility() {
   // expected-note@+1 {{conflicting attribute is here}}
   [[intel::ivdep]] [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
     a[i] = 0;
+
+  // no diagnostics are expected
+  [[intel::disable_loop_pipelining]] [[intel::fpga_pipeline]] for (int i = 0; i != 10; ++i)
+    a[i] = 0;
 }
 
 template<int A, int B, int C>