Landing: a80a8b2533c2
Project / Subsystem
gcc / gcc
Date
2026-04-27
Author
Jeff Law
Commit
a80a8b2533c22a698f21d1ec8f5e5cbe3918671c
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- a80a8b2533c22a698f21d1ec8f5e5cbe3918671c
- source_type
- github
- headline
- Detect more czero opportunities on RISC-V
- tldr
- The RISC-V backend now recognizes more cases where `czero.eqz` can replace a sequence of `sgt`, `snez`, and `and` instructions.
- author
- Jeff Law
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • risc-v
- • optimization
- • code generation
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-04-27T00:00:00.000Z
The RISC-V backend now recognizes more cases where a sequence of sgt, snez, and and instructions can be replaced with the czero.eqz instruction. By generalizing existing patterns to accept both NE and EQ forms and handling commutative AND operations, the compiler can now generate more efficient code sequences when the Zicond extension is enabled. This change improves code generation efficiency in specific scenarios.