Landing: 52330debcdf1
Project / Subsystem
gcc / aarch64
Date
2026-09-21
Author
Matt Turner
Commit
52330debcdf1fcbb858aa1a07d10c5c286828a97
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- aarch64
- patch_id
- —
- commit_hash
- 52330debcdf1fcbb858aa1a07d10c5c286828a97
- source_type
- github
- headline
- AArch64: Support HFmode and BFmode in isinf, isfinite and isnan [PR 66462]
- tldr
- AArch64 now correctly handles floating-point classification for 16-bit formats (_Float16 and __bf16) in isinf, isfinite, and isnan.
- author
- Matt Turner
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- gcc:aarch64: support hfmode and bfmode in isinf, isfinite and isnan [pr 66462]
- series_parts
- []
- tags
-
- • aarch64
- • floating-point
- • builtins
- discussion_id_link
- github:gcc-mirror/gcc#66462
- bugzilla_pr
- —
- date
- 2026-09-21T00:00:00.000Z
The AArch64 backend now supports __builtin_isinf, __builtin_isfinite, and __builtin_isnan for the 16-bit floating-point formats HFmode (_Float16) and BFmode (__bf16). Previously, these built-ins were limited to single (SFmode) and double (DFmode) precision, forcing classification through less accurate floating-point comparisons for smaller types. The new implementation uses integer arithmetic on a zero-extended representation of the floating-point values.