Bug 1764242
| Summary: | glibc: Enhancements for LLVM toolset | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Florian Weimer <fweimer> |
| Component: | glibc | Assignee: | Florian Weimer <fweimer> |
| Status: | CLOSED ERRATA | QA Contact: | qe-baseos-tools-bugs |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 8.2 | CC: | ashankar, codonell, dj, fweimer, mnewsome, pfrankli, skolosov |
| Target Milestone: | rc | Keywords: | Patch, Triaged |
| Target Release: | 8.2 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | glibc-2.28-88.el8 | Doc Type: | No Doc Update |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-04-28 16:50:25 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1746918 | ||
Verified, glibc uses __builtin versions of fpclassify signbit isfinite isnormal isnan isinf functions with clang. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2020:1828 |
We should backport this enhancement to benefit Clang: commit 4997e8f31e7415652c3dedec672c0e9bf8caa9ca Author: Adhemerval Zanella <adhemerval.zanella> Date: Fri Feb 1 10:39:57 2019 -0200 math: Enable some math builtins for clang This patch enable the builtin usage for clang for the C99 functions fpclassify, isfinite, isnormal, isnan, isinf, and sigbit. This allows clang optimize the calls on frontend instead of call the appropriate glibc symbols. Checked on aarch64-linux-gnu and x86_64-linux-gnu. I checked the supported version for each builtin based on released version from clang/llvm. * math/math.h (fpclassify, isfinite, isnormal, isnan): Use builtin for clang 2.8. (signbit): Use builtin for clang 3.3. (isinf): Use builtin for clang 3.7. This should also be backported into Fedora 30+.