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chore: cherry-pick e0052e7af9c9 from v8 (#49286)

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* chore: cherry-pick e0052e7af9c9 from v8

* chore: update patches
This commit is contained in:
Keeley Hammond
2025-12-30 20:02:36 -08:00
committed by GitHub
parent ce0850e4f6
commit a3e69b0f9e
2 changed files with 74 additions and 0 deletions
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patches/v8/.patches
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@@ -1 +1,2 @@
chore_allow_customizing_microtask_policy_per_context.patch
cherry-pick-e0052e7af9c9.patch

73
patches/v8/cherry-pick-e0052e7af9c9.patch Normal file
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@@ -0,0 +1,73 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Victor Gomes <victorgomes@chromium.org>
Date: Tue, 9 Dec 2025 15:16:44 +0100
Subject: [maglev][arm64] Ensure we zero-extend in Int32Multiply
Fixed: 466786677
Change-Id: Ie75222393743a8beeb99f9382dc6d345b8f62604
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7241729
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
Reviewed-by: Darius Mercadier <dmercadier@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#104206}
diff --git a/src/maglev/arm64/maglev-ir-arm64.cc b/src/maglev/arm64/maglev-ir-arm64.cc
index d76c6d126101ca5707c546c64ee4b16b1f487a97..049cb752e739091bca89a2edcd9273a2f70fc978 100644
--- a/src/maglev/arm64/maglev-ir-arm64.cc
+++ b/src/maglev/arm64/maglev-ir-arm64.cc
@@ -323,7 +323,7 @@ void Int32Multiply::GenerateCode(MaglevAssembler* masm,
__ Smull(out, left, right);
// Making sure that the 32-bit output is zero-extended.
- __ Move(out.W(), out.W());
+ __ Mov(out.W(), out.W());
}
void Int32MultiplyOverflownBits::SetValueLocationConstraints() {
@@ -468,7 +468,7 @@ void Int32MultiplyWithOverflow::GenerateCode(MaglevAssembler* masm,
// Making sure that the 32-bit output is zero-extended (and moving it to the
// right register if {out_alias_input} is true).
- __ Move(out, res.W());
+ __ Mov(out, res.W());
}
void Int32DivideWithOverflow::SetValueLocationConstraints() {
@@ -536,7 +536,7 @@ void Int32DivideWithOverflow::GenerateCode(MaglevAssembler* masm,
__ CompareAndBranch(temp, Immediate(0), ne,
__ GetDeoptLabel(this, DeoptimizeReason::kNotInt32));
- __ Move(out, res);
+ __ Mov(out, res);
}
void Int32ModulusWithOverflow::SetValueLocationConstraints() {
diff --git a/test/mjsunit/maglev/regress-466786677.js b/test/mjsunit/maglev/regress-466786677.js
new file mode 100644
index 0000000000000000000000000000000000000000..5b58f1104c09d1a2eb9702af063fa42d50655ed8
--- /dev/null
+++ b/test/mjsunit/maglev/regress-466786677.js
@@ -0,0 +1,22 @@
+// Copyright 2025 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 trigger(cond) {
+ let o = {};
+ let mul = (cond ? 1 : 0x80000000) | 0;
+ print(mul);
+ let idx = (mul * 2) | 0;
+ print(idx);
+ o[0] = 1.1;
+ if (cond) o[1] = 2.2;
+ return o[idx];
+}
+
+%PrepareFunctionForOptimization(trigger);
+trigger(true);
+trigger(false);
+%OptimizeMaglevOnNextCall(trigger);
+trigger(false);