deps: patch V8 to 9.0.257.17

Refs: v8/v8@9.0.257.16...9.0.257.17

PR-URL: #38237
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 9
 #define V8_MINOR_VERSION 0
 #define V8_BUILD_NUMBER 257
-#define V8_PATCH_LEVEL 16
+#define V8_PATCH_LEVEL 17
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/compiler/backend/x64/instruction-selector-x64.cc

@@ -1396,7 +1396,9 @@ void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
         opcode = load_rep.IsSigned() ? kX64Movsxwq : kX64Movzxwq;
         break;
       case MachineRepresentation::kWord32:
-        opcode = load_rep.IsSigned() ? kX64Movsxlq : kX64Movl;
+        // ChangeInt32ToInt64 must interpret its input as a _signed_ 32-bit
+        // integer, so here we must sign-extend the loaded value in any case.
+        opcode = kX64Movsxlq;
         break;
       default:
         UNREACHABLE();

deps/v8/test/mjsunit/compiler/regress-1196683.js

@@ -0,0 +1,56 @@
+// Copyright 2021 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: --allow-natives-syntax
+
+
+(function() {
+  const arr = new Uint32Array([2**31]);
+  function foo() {
+    return (arr[0] ^ 0) + 1;
+  }
+  %PrepareFunctionForOptimization(foo);
+  assertEquals(-(2**31) + 1, foo());
+  %OptimizeFunctionOnNextCall(foo);
+  assertEquals(-(2**31) + 1, foo());
+});
+
+
+// The remaining tests already passed without the bugfix.
+
+
+(function() {
+  const arr = new Uint16Array([2**15]);
+  function foo() {
+    return (arr[0] ^ 0) + 1;
+  }
+  %PrepareFunctionForOptimization(foo);
+  assertEquals(2**15 + 1, foo());
+  %OptimizeFunctionOnNextCall(foo);
+  assertEquals(2**15 + 1, foo());
+})();
+
+
+(function() {
+  const arr = new Uint8Array([2**7]);
+  function foo() {
+    return (arr[0] ^ 0) + 1;
+  }
+  %PrepareFunctionForOptimization(foo);
+  assertEquals(2**7 + 1, foo());
+  %OptimizeFunctionOnNextCall(foo);
+  assertEquals(2**7 + 1, foo());
+})();
+
+
+(function() {
+  const arr = new Int32Array([-(2**31)]);
+  function foo() {
+    return (arr[0] >>> 0) + 1;
+  }
+  %PrepareFunctionForOptimization(foo);
+  assertEquals(2**31 + 1, foo());
+  %OptimizeFunctionOnNextCall(foo);
+  assertEquals(2**31 + 1, foo());
+})();