Landing: 6d1b92ce276d
Project / Subsystem
gcc / i386
Date
2026-09-10
Author
Hongyu Wang
Commit
6d1b92ce276d4705b12c21723f94238a9d34b055
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- 6d1b92ce276d4705b12c21723f94238a9d34b055
- source_type
- github
- headline
- Don't turn quiet FP comparisons into signaling ones
- tldr
- Ensures quiet NaN FP comparisons do not raise FE_INVALID exceptions on i386.
- author
- Hongyu Wang
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • floating-point
- • exceptions
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-10T00:00:00.000Z
This commit prevents floating-point unordered comparisons on i386 from incorrectly raising the FE_INVALID exception when encountering a quiet NaN. For AVX and AVX512, the compiler now selects the dedicated quiet predicate (_UQ). For older SSE2, where only signaling predicates were available for unordered comparisons, the compiler avoids these comparisons when trapping math is enabled and NaNs are honored, thus preventing unintended exceptions.