[PATCH] D24626: [OpenCL] Diagnose assignment to dereference of half type pointer

[Yaxun Liu via cfe-commits]

yaxunl created this revision.
yaxunl added reviewers: Anastasia, bader.
yaxunl added subscribers: cfe-commits, nhaustov, rampitec.
Herald added a subscriber: yaxunl.

https://reviews.llvm.org/D24626

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaExpr.cpp
  test/SemaOpenCL/half.cl

Index: test/SemaOpenCL/half.cl
===================================================================
--- test/SemaOpenCL/half.cl
+++ test/SemaOpenCL/half.cl
@@ -8,8 +8,10 @@
 {
   half a[2]; // expected-error{{declaring variable of type 'half [2]' is not allowed}}
   half b;    // expected-error{{declaring variable of type 'half' is not allowed}}
-  *p; // expected-error{{loading directly from pointer to type 'half' is not allowed}}
-  p[1]; // expected-error{{loading directly from pointer to type 'half' is not allowed}}
+  *p; // expected-error{{loading directly from pointer to type 'half' requires cl_khr_fp16. Use vector data load builtin functions instead}}
+  *p = 0; // expected-error{{assigning directly to pointer to type 'half' requires cl_khr_fp16. Use vector data store builtin functions instead}}
+  p[1]; // expected-error{{loading directly from pointer to type 'half' requires cl_khr_fp16. Use vector data load builtin functions instead}}
+  p[1] = 0; // expected-error{{assigning directly to pointer to type 'half' requires cl_khr_fp16. Use vector data store builtin functions instead}}
 
   float c = 1.0f;
   b = (half) c;  // expected-error{{casting to type 'half' is not allowed}}
@@ -31,7 +33,9 @@
   half a[2];
   half b;
   *p;
+  *p = 0;
   p[1];
+  p[1] = 0;
 
   float c = 1.0f;
   b = (half) c;
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -10085,6 +10085,16 @@
   QualType LHSType = LHSExpr->getType();
   QualType RHSType = CompoundType.isNull() ? RHS.get()->getType() :
                                              CompoundType;
+  // OpenCL v1.2 s6.1.1.1 p2:
+  // The half data type can only be used to declare a pointer to a buffer that
+  // contains half values
+  if (getLangOpts().OpenCL && !getOpenCLOptions().cl_khr_fp16 &&
+    LHSType->isHalfType()) {
+    Diag(Loc, diag::err_opencl_half_load_store) << 1
+        << LHSType.getUnqualifiedType();
+    return QualType();
+  }
+    
   AssignConvertType ConvTy;
   if (CompoundType.isNull()) {
     Expr *RHSCheck = RHS.get();
Index: include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- include/clang/Basic/DiagnosticSemaKinds.td
+++ include/clang/Basic/DiagnosticSemaKinds.td
@@ -659,7 +659,8 @@
 def err_parameters_retval_cannot_have_fp16_type : Error<
   "%select{parameters|function return value}0 cannot have __fp16 type; did you forget * ?">;
 def err_opencl_half_load_store : Error<
-  "%select{loading directly from|assigning directly to}0 pointer to type %1 is not allowed">;
+  "%select{loading directly from|assigning directly to}0 pointer to type %1 requires "
+  "cl_khr_fp16. Use vector data %select{load|store}0 builtin functions instead">;
 def err_opencl_cast_to_half : Error<"casting to type %0 is not allowed">;
 def err_opencl_half_declaration : Error<
   "declaring variable of type %0 is not allowed">;


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