Landing: cb3ca149a51b
Project / Subsystem
gcc / risc-v
Date
2026-04-27
Author
Pan Li
Commit
cb3ca149a51be12f835df60b88e830aea35a3bbd
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- risc-v
- patch_id
- —
- commit_hash
- cb3ca149a51be12f835df60b88e830aea35a3bbd
- source_type
- github
- headline
- RISC-V: Combine vec_duplicate + vmsgtu.vv to vmsgtu.vx based on GR2VR cost
- tldr
- Combines vec_duplicate + vmsgtu.vv to vmsgtu.vx when the cost of GR2VR is zero.
- author
- Pan Li
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • risc-v
- • rvv
- • vectorization
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-04-27T00:00:00.000Z
This commit optimizes RISC-V vector code by combining the vec_duplicate and vmsgtu.vv instructions into a single vmsgtu.vx instruction when the cost of transferring data from general-purpose registers to vector registers (GR2VR) is zero. This optimization reduces the number of instructions executed, improving performance. The combination is skipped if the GR2VR cost is greater than zero.