Landing: a767a6a5609e
Project / Subsystem
gcc / i386
Date
2026-07-22
Author
Odysseas Georgoudis
Commit
a767a6a5609e0d0850291e2a035a8c71e9b14074
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- a767a6a5609e0d0850291e2a035a8c71e9b14074
- source_type
- github
- headline
- Canonicalize PAVG builtins to IFN_AVG_CEIL for i386.
- tldr
- i386 PAVG builtins are now canonicalized to IFN_AVG_CEIL for better optimization.
- author
- Odysseas Georgoudis
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • optimization
- • builtins
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-22T00:00:00.000Z
The i386 PAVG builtins, which compute an unsigned average rounded up but use signed vector types, are now canonicalized to IFN_AVG_CEIL. This change involves view-converting operands to unsigned types and simplifies masked and unmasked calls. The optimization is applied when operands are equal for modes without IFN_AVG_CEIL optabs, enabling more generic simplifications.