Landing: a71504c4120d

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Project / Subsystem

gcc / hppa

Date

2026-10-05

Author

John David Anglin

Commit

a71504c4120daff6fc2ae198fc588e1ce5acaa93

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: hppa
patch_id: —
commit_hash: a71504c4120daff6fc2ae198fc588e1ce5acaa93
source_type: github
headline: hppa: Fix hppa_rtx_costs_shadd_p to handle subregs in inner operands
tldr: Fixes the HPPA backend to correctly handle subregister operands in cost calculations for the 'shadd' instruction.
author: John David Anglin
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • hppa
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/a71504c4120daff6fc2ae198fc588e1ce5acaa93
date: 2026-10-05T00:00:00.000Z

The HPPA backend’s cost calculation for the shadd instruction has been fixed to properly handle subregister operands. Previously, hppa_rtx_costs_shadd_p did not correctly strip SUBREG wrappers from inner operands, leading to incorrect cost estimations and issues with certain patterns on specific HPPA configurations.