[PATCH] x86: fix EVEX no-broadcast disassembly when W=1
Project / Subsystem
binutils / x86
Date
2026-09-05
Proposer
Rohan Shenoy <RohanRadhesh.Shenoy@amd.com>
Source type
public_inbox
Consensus
Proposed
Sentiment
—/10
All attributes
- project
- binutils
- subsystem
- x86
- patch_id
- —
- discussion_id
- 20260905094650.388140-1-RohanRadhesh.Shenoy@amd.com
- source_type
- public_inbox
- title
- [PATCH] x86: fix EVEX no-broadcast disassembly when W=1
- headline
- x86: fix EVEX no-broadcast disassembly when W=1
- tldr
- Fixes objdump to correctly identify invalid broadcast encodings for EVEX instructions when the W-bit is set.
- proposer
- Rohan Shenoy <RohanRadhesh.Shenoy@amd.com>
- consensus
- Proposed
- outcome
- proposed
- sentiment_score
- —
- technical_tradeoffs
- []
- series_id
- —
- series_role
- standalone
- series_parts
- []
- tags
-
- • binutils
- • x86
- • disassembler
- • evex
- bugzilla_url
- —
- date
- 2026-09-05T00:00:00.000Z
[PATCH] x86: fix EVEX no-broadcast disassembly when W=1
This patch corrects an issue in the binutils disassembler where it incorrectly accepts certain EVEX instruction encodings that specify broadcasting when it’s not allowed (specifically for the W=1 case). The fix ensures that these invalid encodings are flagged as errors, matching assembler behavior.