[spirv-writer] Add is_nan support.

This Cl adds support for generating OpIsNan.

Bug: tint:5
Change-Id: If35e46c6cb2719771abdd425ff6116b539da0be0
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/22622
Reviewed-by: David Neto <dneto@google.com>

src/writer/spirv/builder.cc

@@ -1250,6 +1250,8 @@ uint32_t Builder::GenerateIntrinsic(const std::string& name,
     op = spv::Op::OpAny;
   } else if (name == "all") {
     op = spv::Op::OpAll;
+  } else if (name == "is_nan") {
+    op = spv::Op::OpIsNan;
   }
   if (op == spv::Op::OpNop) {
     error_ = "unable to determine operator for: " + name;

src/writer/spirv/builder_intrinsic_test.cc

@@ -18,6 +18,7 @@
 #include "src/ast/call_expression.h"
 #include "src/ast/identifier_expression.h"
 #include "src/ast/type/bool_type.h"
+#include "src/ast/type/f32_type.h"
 #include "src/ast/type/vector_type.h"
 #include "src/ast/variable.h"
 #include "src/context.h"
@@ -32,7 +33,19 @@ namespace {
 
 using BuilderTest = testing::Test;
 
-TEST_F(BuilderTest, Call_Any) {
+struct IntrinsicData {
+  std::string name;
+  std::string op;
+};
+inline std::ostream& operator<<(std::ostream& out, IntrinsicData data) {
+  out << data.name;
+  return out;
+}
+
+using IntrinsicBoolTest = testing::TestWithParam<IntrinsicData>;
+TEST_P(IntrinsicBoolTest, Call_Bool) {
+  auto param = GetParam();
+
   ast::type::BoolType bool_type;
   ast::type::VectorType vec3(&bool_type, 3);
 
@@ -41,8 +54,9 @@ TEST_F(BuilderTest, Call_Any) {
 
   ast::ExpressionList params;
   params.push_back(std::make_unique<ast::IdentifierExpression>("v"));
-  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>("any"),
-                           std::move(params));
+  ast::CallExpression expr(
+      std::make_unique<ast::IdentifierExpression>(param.name),
+      std::move(params));
 
   Context ctx;
   ast::Module mod;
@@ -64,21 +78,67 @@ TEST_F(BuilderTest, Call_Any) {
 )");
   EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
             R"(%7 = OpLoad %3 %1
-%6 = OpAny %4 %7
+%6 = )" + param.op +
+                " %4 %7\n");
+}
+INSTANTIATE_TEST_SUITE_P(BuilderTest,
+                         IntrinsicBoolTest,
+                         testing::Values(IntrinsicData{"any", "OpAny"},
+                                         IntrinsicData{"all", "OpAll"}));
+
+using IntrinsicFloatTest = testing::TestWithParam<IntrinsicData>;
+TEST_P(IntrinsicFloatTest, Call_Float_Scalar) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+
+  auto var =
+      std::make_unique<ast::Variable>("v", ast::StorageClass::kPrivate, &f32);
+
+  ast::ExpressionList params;
+  params.push_back(std::make_unique<ast::IdentifierExpression>("v"));
+  ast::CallExpression expr(
+      std::make_unique<ast::IdentifierExpression>(param.name),
+      std::move(params));
+
+  Context ctx;
+  ast::Module mod;
+  TypeDeterminer td(&ctx, &mod);
+  td.RegisterVariableForTesting(var.get());
+
+  ASSERT_TRUE(td.DetermineResultType(&expr)) << td.error();
+
+  Builder b(&mod);
+  b.push_function(Function{});
+  ASSERT_TRUE(b.GenerateGlobalVariable(var.get())) << b.error();
+
+  EXPECT_EQ(b.GenerateCallExpression(&expr), 5u) << b.error();
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%3 = OpTypeFloat 32
+%2 = OpTypePointer Private %3
+%4 = OpConstantNull %3
+%1 = OpVariable %2 Private %4
+%6 = OpTypeBool
 )");
+  EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
+            R"(%7 = OpLoad %3 %1
+%5 = )" + param.op +
+                " %6 %7\n");
 }
 
-TEST_F(BuilderTest, Call_All) {
-  ast::type::BoolType bool_type;
-  ast::type::VectorType vec3(&bool_type, 3);
+TEST_P(IntrinsicFloatTest, Call_Float_Vector) {
+  auto param = GetParam();
+
+  ast::type::F32Type f32;
+  ast::type::VectorType vec3(&f32, 3);
 
   auto var =
       std::make_unique<ast::Variable>("v", ast::StorageClass::kPrivate, &vec3);
 
   ast::ExpressionList params;
   params.push_back(std::make_unique<ast::IdentifierExpression>("v"));
-  ast::CallExpression expr(std::make_unique<ast::IdentifierExpression>("all"),
-                           std::move(params));
+  ast::CallExpression expr(
+      std::make_unique<ast::IdentifierExpression>(param.name),
+      std::move(params));
 
   Context ctx;
   ast::Module mod;
@@ -92,17 +152,23 @@ TEST_F(BuilderTest, Call_All) {
   ASSERT_TRUE(b.GenerateGlobalVariable(var.get())) << b.error();
 
   EXPECT_EQ(b.GenerateCallExpression(&expr), 6u) << b.error();
-  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeBool
+  EXPECT_EQ(DumpInstructions(b.types()), R"(%4 = OpTypeFloat 32
 %3 = OpTypeVector %4 3
 %2 = OpTypePointer Private %3
 %5 = OpConstantNull %3
 %1 = OpVariable %2 Private %5
+%8 = OpTypeBool
+%7 = OpTypeVector %8 3
 )");
   EXPECT_EQ(DumpInstructions(b.functions()[0].instructions()),
-            R"(%7 = OpLoad %3 %1
-%6 = OpAll %4 %7
-)");
+            R"(%9 = OpLoad %3 %1
+%6 = )" + param.op +
+                " %7 %9\n");
 }
+INSTANTIATE_TEST_SUITE_P(BuilderTest,
+                         IntrinsicFloatTest,
+                         testing::Values(IntrinsicData{"is_nan", "OpIsNan"}));
+
 }  // namespace
 }  // namespace spirv
 }  // namespace writer