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[compiler][x64] Fix bug in InstructionSelector::ChangeInt32ToInt64

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Bug: chromium:1196683
Change-Id: Ib4ea738b47b64edc81450583be4c80a41698c3d1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2820971
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73903}
This commit is contained in:
Georg Neis 2021-04-12 09:42:03 +02:00 committed by Commit Bot
parent 1e4b1c521a
commit 02f84c745f
2 changed files with 59 additions and 1 deletions
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4
src/compiler/backend/x64/instruction-selector-x64.cc
View File

@ -1376,7 +1376,9 @@ 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();

56
test/mjsunit/compiler/regress-1196683.js Normal file
View File

@ -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());
})();