Landing: 95986d90c4e9

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Project / Subsystem

gcc / pta

Date

2026-07-01

Author

Eric Botcazou

Commit

95986d90c4e90691820f08f6f43d48d24cc44495

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: pta
patch_id: —
commit_hash: 95986d90c4e90691820f08f6f43d48d24cc44495
source_type: github
headline: Fix incorrect optimization of conditional dynamic allocation in PTA
tldr: Corrects a bug where DSE incorrectly removed memcpy calls for dynamically allocated memory returned from functions.
author: Eric Botcazou
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• PTA
• alias analysis
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/95986d90c4e90691820f08f6f43d48d24cc44495
date: 2026-07-01T00:00:00.000Z

A regression in the Pointer Tangling Analysis (PTA) pass incorrectly eliminates calls to memcpy when the destination is dynamically allocated and the allocation is conditional. This fix ensures that the analysis correctly handles cases where the dynamic allocation’s result is returned from a function, preventing premature optimization that could violate program semantics.