Landing: 919c0d16c91c
Project / Subsystem
gcc / i386
Date
2026-09-07
Author
liuhongt
Commit
919c0d16c91c930c374db6665f55595653511636
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- 919c0d16c91c930c374db6665f55595653511636
- source_type
- github
- headline
- i386: Fix V2SF zero move in V4SF vec_init for non-SSE2 targets
- tldr
- i386: Fixes V4SF vec_init on targets without SSE2 by using emit_move_insn to materialize V2SF zeros correctly.
- author
- liuhongt
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • vector
- • optimization
- • sse
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-07T00:00:00.000Z
This patch resolves an issue on i386 targets that do not support SSE2, where initializing a V4SF vector with zeros for its upper V2SF half would fail. The old implementation used a raw SET instruction, bypassing fallbacks that would correctly materialize the zero using integer modes when movv2sf was unavailable. By switching to emit_move_insn, the zero is now correctly materialized as a DImode move, resolving the problem and generating expected code sequences.