Landing: 72cedd48e12a
Project / Subsystem
gcc / x86
Date
2026-08-24
Author
H.J. Lu
Commit
72cedd48e12af8cd500622b487de4354d61aeb24
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- x86
- patch_id
- —
- commit_hash
- 72cedd48e12af8cd500622b487de4354d61aeb24
- source_type
- github
- headline
- x86: Remove SSE instructions that do not zero-extend
- tldr
- Removes SSE instructions from x86 target that incorrectly handled zero-extension.
- author
- H.J. Lu
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • x86
- • sse
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-24T00:00:00.000Z
This commit removes SSE instructions from the x86 target that were incorrectly implemented. Specifically, *fix_trunc<mode>si_sse_zext and *fix_trunc<mode>si_sse_2_zext did not perform the expected zero-extension of SImode to DImode. The changes also include a new test case to verify the fix.