[PATCH] AArch64: Optimize ADD relocations that resolve to zero
Project / Subsystem
binutils / aarch64
Date
2026-07-24
Proposer
Sivan Shani <sivan.shani@arm.com>
Source type
public_inbox
Consensus
Proposed
Sentiment
—/10
Technical tradeoffs
- • Replacing ADD with MOV/NOP can reduce instruction count and potentially improve performance by utilizing simpler instructions or reducing pipeline stalls.
- • Ensuring the optimization is applied correctly according to the ELF specification and handles all edge cases (e.g., SP register usage, 32-bit vs 64-bit modes).
All attributes
- project
- binutils
- subsystem
- aarch64
- patch_id
- —
- discussion_id
- 20260724095859.909158-1-sivan.shani@arm.com
- source_type
- public_inbox
- title
- [PATCH] AArch64: Optimize ADD relocations that resolve to zero
- headline
- AArch64: Optimize ADD relocations that resolve to zero
- tldr
- Implements an optimization for AArch64 ADD instructions that can be replaced by MOV or NOP.
- proposer
- Sivan Shani <sivan.shani@arm.com>
- consensus
- Proposed
- outcome
- proposed
- sentiment_score
- —
- technical_tradeoffs
-
- • Replacing ADD with MOV/NOP can reduce instruction count and potentially improve performance by utilizing simpler instructions or reducing pipeline stalls.
- • Ensuring the optimization is applied correctly according to the ELF specification and handles all edge cases (e.g., SP register usage, 32-bit vs 64-bit modes).
- series_id
- —
- series_role
- standalone
- series_parts
- []
- tags
-
- • aarch64
- • optimization
- • linker
- • performance
- bugzilla_url
- —
- date
- 2026-07-24T00:00:00.000Z
[PATCH] AArch64: Optimize ADD relocations that resolve to zero
Sivan Shani proposes an optimization for the AArch64 architecture in binutils, following the ‘ELF for the Arm 64-bit Architecture’ specification. The patch optimizes ADD instructions where the immediate value becomes zero after relocation, replacing them with MOV or NOP instructions for efficiency. The changes include updates to BFD and the ld testsuite.