Landing: 1b722d3b41f1

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Project / Subsystem

gcc / algol68

Date

2026-07-20

Author

chris hermansen

Commit

1b722d3b41f1699b3d60db6747e234412b314e02

Source

github

Perf win

Yes

Breaking

No

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All attributes

project: gcc
subsystem: algol68
patch_id: —
commit_hash: 1b722d3b41f1699b3d60db6747e234412b314e02
source_type: github
headline: algol68: New 'whole' procedure implementation from Revised Report
tldr: Replaces the old 'whole' procedure with a more robust and efficient version based on the Algol68 Revised Report.
author: chris hermansen
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • algol68
• compiler bug
• integer conversion
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1b722d3b41f1699b3d60db6747e234412b314e02
date: 2026-07-20T00:00:00.000Z

GCC’s Algol68 compiler has a new implementation for the whole procedure, based on the Revised Report. This version addresses a critical bug in the previous implementation where it failed for negative values closest to the minimum integer, due to an incorrect application of the ABS operator on two’s complement systems. The new implementation avoids ABS and processes numbers left-to-right, using string concatenation or length determination for efficiency, and is immune to the overflow issue with ABS(minimum_integer).