Landing: b01cd452a6c7

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Project / Subsystem

gcc / gcc/avoid-store-forwarding

Date

2026-08-20

Author

Konstantinos Eleftheriou

Commit

b01cd452a6c7ba2a2f95a77f62f0727cbbe9d6a5

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/avoid-store-forwarding
patch_id: —
commit_hash: b01cd452a6c7ba2a2f95a77f62f0727cbbe9d6a5
source_type: github
headline: Reject BLKmode memory operands for store forwarding.
tldr: Avoids compiler assertion by rejecting BLKmode memory operands in store forwarding.
author: Konstantinos Eleftheriou
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• compiler bug
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/b01cd452a6c7ba2a2f95a77f62f0727cbbe9d6a5
date: 2026-08-20T00:00:00.000Z

The store forwarding optimization pass now rejects BLKmode memory operands when collecting candidates. Previously, it only rejected operands with unknown or non-constant sizes, leading to an assertion failure when building bit insert sequences for BLKmode stores. This change prevents such assertions and improves robustness.