Landing: c117ca0fc276
Project / Subsystem
binutils / x86
Date
2026-05-27
Author
H.J. Lu
Commit
c117ca0fc27654355839ee75010f25d46e6aeecd
Source
public_inbox
Perf win
No
Breaking
No
All attributes
- project
- binutils
- subsystem
- x86
- patch_id
- —
- commit_hash
- c117ca0fc27654355839ee75010f25d46e6aeecd
- source_type
- public_inbox
- headline
- x86: Check XMM destination for VPBROADCASTQ optimization
- tldr
- The assembler now correctly optimizes 128-bit VPBROADCASTQ instructions with XMM destinations.
- author
- H.J. Lu
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • x86
- • assembler
- • optimization
- • vector
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-27T00:00:00.000Z
The assembler’s optimization for 128-bit VPBROADCASTQ to VPUNPCKLQDQ transformation was incorrectly applied to instructions with YMM destinations, leading to invalid code. This commit adds a check to ensure the destination operand is an XMM register before applying the optimization, fixing the code generation error. The assembler will now generate correct code for VPBROADCASTQ instructions with both XMM and YMM destinations.