Landing: d33d3552eb80
Project / Subsystem
gcc / gcc
Date
2026-09-27
Author
Roger Sayle
Commit
d33d3552eb807d64d05f0732ff9003bfae706f03
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- d33d3552eb807d64d05f0732ff9003bfae706f03
- source_type
- github
- headline
- Improve iq2000 port code for AOR optabs and IOR with 0x0
- tldr
- Optimizes iq2000 port by using IOR over PLUS for equivalent operations and simplifying IOR with zero.
- author
- Roger Sayle
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • iq2000
- • optimization
- • code generation
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-27T00:00:00.000Z
This commit improves code generation for the iq2000 port by steering the AOR (Arithmetic OR) optab to use IOR instead of PLUS when they are equivalent. It also optimizes the low-part IOR operation when one operand is zero, transforming it into a simple copy. For constant loads, this means emitting only the LUI instruction. These changes resolve poor code generation issues previously observed for the iq2000 port.