[spirv] add unittest for sizeof() (#2231)

tools/clang/test/CodeGenSPIRV/op.sizeof.hlsl

@@ -0,0 +1,48 @@
+// Run: %dxc -E main -T vs_6_2 -HV 2018 -enable-16bit-types
+
+struct Empty {};
+
+AppendStructuredBuffer<int> buf;
+
+void main() {
+  // Test size and packing of scalar types, vectors and arrays all at once.
+
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_12
+  buf.Append(sizeof(int16_t3[2]));
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_12
+  buf.Append(sizeof(half3[2]));
+
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_24
+  buf.Append(sizeof(int3[2]));
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_24
+  buf.Append(sizeof(float3[2]));
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_24
+  buf.Append(sizeof(bool3[2]));
+
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_48
+  buf.Append(sizeof(int64_t3[2]));
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_48
+  buf.Append(sizeof(double3[2]));
+
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_0
+  buf.Append(sizeof(Empty[2]));
+
+  // CHECK:      [[buf:%\d+]] = OpAccessChain %_ptr_Uniform_int %buf %uint_0
+  // CHECK-NEXT:                OpStore [[buf]] %int_8
+  struct
+  {
+    int16_t i16;
+    // 2-byte padding
+    struct { float f32; } s; // Nested type
+    struct {} _; // Zero-sized field.
+  } complexStruct;
+  buf.Append(sizeof(complexStruct));
+}

tools/clang/unittests/SPIRV/CodeGenSpirvTest.cpp

@@ -377,6 +377,7 @@ TEST_F(FileTest, OpTextureMipsAccess) {
 TEST_F(FileTest, OpTextureSampleAccess) {
   runFileTest("op.texture.sample-access.hlsl");
 }
+TEST_F(FileTest, OpSizeOf) { runFileTest("op.sizeof.hlsl"); }
 
 // For casting
 TEST_F(FileTest, CastNoOp) { runFileTest("cast.no-op.hlsl"); }