Landing: ee30b1af53bb

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Project / Subsystem

gcc / rs6000

Date

2026-07-22

Author

Kishan Parmar

Commit

ee30b1af53bb4ac6ca3c69596d75eef32ec187b1

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: rs6000
patch_id: —
commit_hash: ee30b1af53bb4ac6ca3c69596d75eef32ec187b1
source_type: github
headline: rs6000: Build DMF accumulators using DMR insert operations
tldr: Future PowerPC Dense Math Facility accumulators will use new DMR insert operations.
author: Kishan Parmar
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • rs6000
• powerpc
• dmf
• accumulator
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/ee30b1af53bb4ac6ca3c69596d75eef32ec187b1
date: 2026-07-22T00:00:00.000Z

GCC’s rs6000 backend is updated to build Dense Math Facility (DMF) accumulators using new Dense Math Register (DMR) insert operations rather than xxmtacc/xxmfacc. This change prepares for future PowerPC processors where accumulators will be backed by DMRs. It includes adding DMR register predicate support, enabling necessary VSX pair patterns under TARGET_DMF, and modifying accumulator assembly/disassembly to use accumulator operands and avoid older instructions when DMF is active.