Landing: d0430a02880a
Project / Subsystem
gcc / rs6000
Date
2026-07-16
Author
Avinash Jayakar
Commit
d0430a02880a0a72c073762b53fa5a8fa4eab028
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- rs6000
- patch_id
- —
- commit_hash
- d0430a02880a0a72c073762b53fa5a8fa4eab028
- source_type
- github
- headline
- rs6000: Update mma insns to use wD constraint and update %A printer
- tldr
- Refines MMA instruction definitions for PowerPC, improving register constraint handling.
- author
- Avinash Jayakar
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • rs6000
- • powerpc
- • mma
- • dense-math
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-16T00:00:00.000Z
This patch updates the definition of Matrix Multiply-Accumulate (MMA) instructions for the PowerPC rs6000 architecture. It replaces the generic ‘d’ constraint for accumulator registers with the more specific ‘wD’ constraint and introduces a new accumulator_operand. This change ensures that when the dense-math option is enabled, these accumulators correctly map to Dense Math Registers (DMRs). Additionally, the %A operand printer is updated to display DMR register numbers when dense-math is active, improving the clarity of generated assembly.