Landing: 20ee88e64f70
Project / Subsystem
gcc / risc-v
Date
2026-05-18
Author
Christoph Müllner
Commit
20ee88e64f705c42a52f74e46322c20a617b85c5
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- risc-v
- patch_id
- —
- commit_hash
- 20ee88e64f705c42a52f74e46322c20a617b85c5
- source_type
- github
- headline
- Adds Zilsd alignment control options for RISC-V.
- tldr
- Introduces `-mzilsd-word-align` and `-mzilsd-strict-align` options to control alignment policies for RISC-V Zilsd/Zclsd doubleword memory accesses.
- author
- Christoph Müllner
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • riscv
- • zilsd
- • alignment
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-18T00:00:00.000Z
This commit introduces new command-line options to control the alignment policies for RISC-V’s Zilsd/Zclsd extensions, which provide doubleword memory access instructions. The new options, -mzilsd-word-align and -mzilsd-strict-align, allow users to explicitly select between word-aligned and naturally aligned variants. If the selected alignment policy does not permit a 2 * XLEN access, the compiler will expand the access using scalar bit-field helpers instead of using Zilsd load or store instructions.