Landing: 4d855f3af5b1

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Project / Subsystem

gcc / fortran

Date

2026-07-26

Author

Thomas Koenig

Commit

4d855f3af5b18e539585d1d4832470e500323c12

Source

github

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Breaking

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All attributes

project: gcc
subsystem: fortran
patch_id: —
commit_hash: 4d855f3af5b18e539585d1d4832470e500323c12
source_type: github
headline: Fix size calculation for reallocation for matmul of rank 2 a and rank 1 b.
tldr: Corrects Fortran matmul LHS reallocation size calculation for specific rank combinations.
author: Thomas Koenig
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • fortran
• matmul
• reallocation
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4d855f3af5b18e539585d1d4832470e500323c12
date: 2026-07-26T00:00:00.000Z

This commit fixes a bug in the Fortran front-end’s matmul operation that affected the size calculation for reallocating the left-hand side (LHS) expression when it is allocatable. The fix specifically addresses the case where a rank-2 array is multiplied by a rank-1 array, ensuring the LHS is resized correctly.