[AMDGPU][Clang] Add check of size for __builtin_amdgcn_global_load_lds (#93064)

Author: shiltian

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -12385,4 +12385,8 @@ def err_acc_reduction_composite_type
 def err_acc_reduction_composite_member_type :Error<
     "OpenACC 'reduction' composite variable must not have non-scalar field">;
 def note_acc_reduction_composite_member_loc : Note<"invalid field is here">;
+
+// AMDGCN builtins diagnostics
+def err_amdgcn_global_load_lds_size_invalid_value : Error<"invalid size value">;
+def note_amdgcn_global_load_lds_size_valid_value : Note<"size must be 1, 2, or 4">;
 } // end of sema component.

clang/lib/Sema/SemaChecking.cpp

@@ -5696,6 +5696,28 @@ bool Sema::CheckAMDGCNBuiltinFunctionCall(unsigned BuiltinID,
   // position of memory order and scope arguments in the builtin
   unsigned OrderIndex, ScopeIndex;
   switch (BuiltinID) {
+  case AMDGPU::BI__builtin_amdgcn_global_load_lds: {
+    constexpr const int SizeIdx = 2;
+    llvm::APSInt Size;
+    Expr *ArgExpr = TheCall->getArg(SizeIdx);
+    ExprResult R = VerifyIntegerConstantExpression(ArgExpr, &Size);
+    if (R.isInvalid())
+      return true;
+    switch (Size.getSExtValue()) {
+    case 1:
+    case 2:
+    case 4:
+      return false;
+    default:
+      Diag(ArgExpr->getExprLoc(),
+           diag::err_amdgcn_global_load_lds_size_invalid_value)
+          << ArgExpr->getSourceRange();
+      Diag(ArgExpr->getExprLoc(),
+           diag::note_amdgcn_global_load_lds_size_valid_value)
+          << ArgExpr->getSourceRange();
+      return true;
+    }
+  }
   case AMDGPU::BI__builtin_amdgcn_get_fpenv:
   case AMDGPU::BI__builtin_amdgcn_set_fpenv:
     return false;

clang/test/SemaOpenCL/builtins-amdgcn-gfx940-err.cl

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -cl-std=CL2.0 -O0 -triple amdgcn-unknown-unknown -target-cpu gfx940 -S -verify -o - %s
+// REQUIRES: amdgpu-registered-target
+
+typedef unsigned int u32;
+
+void test_global_load_lds_unsupported_size(global u32* src, local u32 *dst, u32 size) {
+  __builtin_amdgcn_global_load_lds(src, dst, size, /*offset=*/0, /*aux=*/0); // expected-error{{expression is not an integer constant expression}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/5, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/0, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/3, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/12, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/16, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+  __builtin_amdgcn_global_load_lds(src, dst, /*size=*/-1, /*offset=*/0, /*aux=*/0); // expected-error{{invalid size value}} expected-note {{size must be 1, 2, or 4}}
+}

llvm/include/llvm/IR/IntrinsicsAMDGPU.td

@@ -2472,7 +2472,7 @@ class AMDGPUGlobalLoadLDS :
     [],
     [LLVMQualPointerType<1>,            // Base global pointer to load from
      LLVMQualPointerType<3>,            // LDS base pointer to store to
-     llvm_i32_ty,                       // Data byte size: 1/2/4 (/12/16 for gfx950)
+     llvm_i32_ty,                       // Data byte size: 1/2/4
      llvm_i32_ty,                       // imm offset (applied to both global and LDS address)
      llvm_i32_ty],                      // auxiliary data (imm, cachepolicy (bit 0 = sc0,
                                         //                                   bit 1 = sc1,