Landing: c9e6fa83a85e
Project / Subsystem
gcc / i386
Date
2026-07-08
Author
Uros Bizjak
Commit
c9e6fa83a85e8e86811bf03c71e607247397e082
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- c9e6fa83a85e8e86811bf03c71e607247397e082
- source_type
- github
- headline
- i386: Fix CCMP instruction support checks for floating-point modes
- tldr
- Ensures CCMP instruction generation respects available floating-point instruction set support on x86.
- author
- Uros Bizjak
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • compiler
- • optimization
- • floating point
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-08T00:00:00.000Z
This commit corrects how the GCC compiler checks for support of the CCMP instruction on i386 targets when dealing with floating-point comparisons. Previously, the compiler might attempt to generate CCMP sequences for modes like DFmode (double-precision) or SFmode (single-precision) without verifying that the necessary hardware instruction sets (like SSE or AVX512FP16) were enabled. The fix restricts the use of CCMP based on the target’s floating-point capabilities, preventing incorrect code generation.