Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 86167

Summary: fesetround() does not set SSE floating-point rounding modes
Product: [Retired] Red Hat Linux Reporter: David Monniaux <david.monniaux>
Component: glibcAssignee: Jakub Jelinek <jakub>
Status: CLOSED UPSTREAM QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.0CC: fweimer, mitr
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2003-04-29 07:19:14 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description David Monniaux 2003-03-15 13:08:18 UTC
Description of problem:

fesetround() does not set SSE rounding modes, even though gcc now has options to
compile floating-point code to SSE.

(Checked in glibc source code.)

Version-Release number of selected component (if applicable): 2.2.93


How reproducible:

Always.

Steps to Reproduce:
1.Write code using fesetround() and whose results depends on the correct
rounding mode being set.
2.Compile with or without -march=pentium4 -msse -msse2
3.Compare the results.
    
Actual results:

The rounding mode is not set.

Expected results:

The rounding mode should be set.

Additional info:

Reported to glibc gnats as bug libc/4987.
Fix: use stmxcsr/ldmxcsr.

Comment 1 Ulrich Drepper 2003-04-29 07:19:14 UTC
I've checked in a patch in the official glibc CVS archive.  They should appear
in the next RPM.