[wasm] Fix constant folding with signalling NaN.

test/mjsunit/wasm/float-constant-folding.js

Index: test/mjsunit/wasm/float-constant-folding.js
diff --git a/test/mjsunit/wasm/float-constant-folding.js b/test/mjsunit/wasm/float-constant-folding.js
new file mode 100644
index 0000000000000000000000000000000000000000..30757c403d75efb4b95356de2bfd31fc49f0de52
--- /dev/null
+++ b/test/mjsunit/wasm/float-constant-folding.js
@@ -0,0 +1,220 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --expose-wasm
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+(function() {
+  print("F32: sNaN - 0 = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F32Sub0", kSig_i_i)
+    .addBody([
+      kExprGetLocal, 0,
+      kExprF32ReinterpretI32,
+      kExprF32Const, 0x00, 0x00, 0x00, 0x00, // 0.0
+      kExprF32Sub,
+      kExprI32ReinterpretF32,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  // F32Sub0(signalling_NaN)
+  assertEquals(0x7fe00000, module.exports.F32Sub0(0x7fa00000));
+})();
+
+(function() {
+  print("F32: sNaN - X = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F32NaNSubX", kSig_i_i)
+    .addBody([
+      kExprF32Const, 0x00, 0x00, 0xa0, 0x7f,
+      kExprF32Const, 0x12, 0x34, 0x56, 0x78,
+      kExprF32Sub,
+      kExprI32ReinterpretF32,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7fe00000, module.exports.F32NaNSubX());
+})();
+
+(function() {
+  print("F32: X - sNaN = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F32XSubNaN", kSig_i_i)
+    .addBody([
+      kExprF32Const, 0x12, 0x34, 0x56, 0x78,
+      kExprF32Const, 0x00, 0x00, 0xa0, 0x7f,
+      kExprF32Sub,
+      kExprI32ReinterpretF32,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7fe00000, module.exports.F32XSubNaN());
+})();
+
+(function() {
+  print("F64: X + sNaN = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F32XAddNaN", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Add,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F32XAddNaN());
+})();
+
+(function() {
+  print("F64: sNaN - 0 = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64Sub0", kSig_i_i)
+    .addBody([
+      kExprI64Const, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xf9, 0xff, 0x00,
+      kExprF64ReinterpretI64,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 0.0
+      kExprF64Sub,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64Sub0());
+})();
+
+(function() {
+  print("F64: sNaN - X = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64NaNSubX", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Sub,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64NaNSubX());
+})();
+
+(function() {
+  print("F64: X - sNaN = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64XSubNaN", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Sub,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64XSubNaN());
+})();
+
+(function() {
+  print("F64: sNaN * 1 = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64Mul1", kSig_i_i)
+    .addBody([
+      kExprI64Const, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xf9, 0xff, 0x00,
+      kExprF64ReinterpretI64,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,
+      kExprF64Mul,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64Mul1());
+})();
+
+(function() {
+  print("F64: X * sNaN = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64XMulNaN", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Mul,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64XMulNaN());
+})();
+
+(function() {
+  print("F64: sNaN / 1 = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64Div1", kSig_i_i)
+    .addBody([
+      kExprI64Const, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0xf9, 0xff, 0x00,
+      kExprF64ReinterpretI64,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf0, 0x3f,
+      kExprF64Div,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64Div1());
+})();
+
+(function() {
+  print("F64: X / sNaN = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64XDivNaN", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Div,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64XDivNaN());
+})();
+
+(function() {
+  print("F64: sNaN / X = qNaN");
+  var builder = new WasmModuleBuilder();
+  builder.addFunction("F64NaNDivX", kSig_i_i)
+    .addBody([
+      kExprF64Const, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf2, 0x7f,
+      kExprF64Const, 0xde, 0xbc, 0x0a, 0x89, 0x67, 0x45, 0x23, 0x01,
+      kExprF64Div,
+      kExprI64ReinterpretF64,
+      kExprI64Const, 32,
+      kExprI64ShrU,
+      kExprI32ConvertI64,
+            ])
+            .exportFunc();
+  var module = builder.instantiate();
+  assertEquals(0x7ffa0000, module.exports.F64NaNDivX());
+})();