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chore: cherry-pick d5b0cb2acffe from v8 (#50232)

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* chore: cherry-pick d5b0cb2acffe from v8

* chore: update patches

---------

Co-authored-by: Samuel Attard <sattard@anthropic.com>
This commit is contained in:
Keeley Hammond
2026-03-12 19:54:53 -07:00
committed by GitHub
parent 1573d6b28c
commit 8e0f534873
2 changed files with 51 additions and 0 deletions
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patches/v8/.patches
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@@ -3,3 +3,4 @@ turboshaft_avoid_introducing_too_many_variables.patch
runtime_setprototypeproperties_handling_of.patch
runtime_correcting_setprototypeproperties.patch
reduce_stack_memory_consumption_in_bytecodegenerator.patch
cherry-pick-d5b0cb2acffe.patch

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patches/v8/cherry-pick-d5b0cb2acffe.patch Normal file
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@@ -0,0 +1,50 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Darius Mercadier <dmercadier@chromium.org>
Date: Wed, 25 Feb 2026 12:56:18 +0100
Subject: [M144 Merge] [maglev] fix CanElideWriteBarrier Smi recording for phis
Recording a Tagged use is not enough for 2 reasons:
* Tagged uses are sometimes ignored, in particular for loop phis
where we distinguish in-loop and out-of-loop uses.
* This Tagged use could only prevent untagging of this specific phi,
but none of its inputs. So we could have a Smi phi as input to the
current phi which gets untagged and retagged to a non-Smi, all
while the current phi doesn't get untagged.
(cherry picked from commit a54bf5cd45e5b119e2afe6019428e81c3d626fb3)
Change-Id: I9b3a2ea339f2c9d81dbb74a44425ba55d8c73871
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7604255
Auto-Submit: Darius Mercadier <dmercadier@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Darius Mercadier <dmercadier@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#105444}
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/7659106
Auto-Submit: Srinivas Sista <srinivassista@chromium.org>
Reviewed-by: Rezvan Mahdavi Hezaveh <rezvan@chromium.org>
Commit-Queue: Srinivas Sista <srinivassista@chromium.org>
Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Cr-Commit-Position: refs/branch-heads/14.4@{#64}
Cr-Branched-From: 80acc26727d5a34e77dabeebe7c9213ec1bd4768-refs/heads/14.4.258@{#1}
Cr-Branched-From: ce7e597e90f6df3fa4b6df224bc613b80c635450-refs/heads/main@{#104020}
diff --git a/src/maglev/maglev-graph-builder.cc b/src/maglev/maglev-graph-builder.cc
index 4664ca78b4413da6a3d9d6cafa705d33f5c02ee2..c682aec3ff109e42290c2e2ddec350f913e4e063 100644
--- a/src/maglev/maglev-graph-builder.cc
+++ b/src/maglev/maglev-graph-builder.cc
@@ -4496,7 +4496,11 @@ bool MaglevGraphBuilder::CanElideWriteBarrier(ValueNode* object,
ValueNode* value) {
if (value->Is<RootConstant>() || value->Is<ConsStringMap>()) return true;
if (!IsEmptyNodeType(GetType(value)) && CheckType(value, NodeType::kSmi)) {
- value->MaybeRecordUseReprHint(UseRepresentation::kTagged);
+ if constexpr (SmiValuesAre31Bits()) {
+ if (Phi* value_as_phi = value->TryCast<Phi>()) {
+ value_as_phi->SetUseRequires31BitValue();
+ }
+ }
return true;
}