Landing: e15e9cff8f81

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Project / Subsystem

gcc / rs6000

Date

2026-07-12

Author

Surya Kumari Jangala

Commit

e15e9cff8f813cbb3a8fd5505dbf3f15e1ece525

Source

github

Perf win

Yes

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: rs6000
patch_id: —
commit_hash: e15e9cff8f813cbb3a8fd5505dbf3f15e1ece525
source_type: github
headline: rs6000: Introduce -mdense-math option for Dense Math Facility
tldr: New -mdense-math option controls Dense Math Facility instructions on PowerPC.
author: Surya Kumari Jangala
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • rs6000
• powerpc
• compiler option
• instruction
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/e15e9cff8f813cbb3a8fd5505dbf3f15e1ece525
date: 2026-07-12T00:00:00.000Z

The PowerPC backend now supports a new compiler option, -mdense-math, to control the emission of Dense Math Facility (DMF) instructions. When targeting ‘future’ CPUs, DMF is enabled by default unless explicitly disabled. Attempting to use -mdense-math on unsupported targets results in a hard error.