Red Hat Bugzilla – Bug 463604
[LTC 6.0 FEAT] 201179:Decimal Floating Point support in gcc backend - PFPO
Last modified: 2011-05-13 09:23:37 EDT
Emily J. Ratliff <firstname.lastname@example.org> - 2008-09-16 18:05 EDT
1. Feature Overview:
Feature Id: 
a. Name of Feature: Decimal Floating Point support in gcc backend - PFPO
b. Feature Description
The new pfpo instruction coming with z9 GA3 provides comprehensive conversion routines between
different floating point formats. This items enables gcc to make use of the new instruction in order
to implement type conversions.
2. Feature Details:
Arch Specificity: Purely Arch Specific Code
Affects Toolchain: Yes
Delivery Mechanism: Backport
Request Type: Toolchain - Enhancement from IBM
d. Upstream Acceptance: Accepted
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: IBM code
g. Component Version Target: gcc 4.3
3. Business Case
Make use of new hardware instructions and thus Improve Performance of Applications running
operations on DFP type values.
4. Primary contact at Red Hat:
5. Primary contacts at Partner:
Project Management Contact:
Hans-Georg Markgraf, email@example.com, Boeblingen 49-7031-16-3978
Gonzalo Muelas Serrano, firstname.lastname@example.org
Thomas Schwarz, email@example.com
RHEL 6 will include at least gcc-4.3, so this should not be a problem.
The feature requested has already been accepted into the upstream code base
planned for the next major release of Red Hat Enterprise Linux.
When the next milestone release of Red Hat Enterprise Linux 6 is available,
please verify that the feature requested is present and functioning as
Fixed in 'gcc-4.4.1-22.el6', included in compose 'RHEL6.0-20091028.0'.
Moving to ON_QA.
IBM is signed up to test and provide feedback
------- Comment From firstname.lastname@example.org 2010-08-24 11:06 EDT-------
Decimal Floating Point support will be technical preview until additional fixes are provided via z.stream
=> This need to be documented in R6 release notes
Snap11 includes the rebase build on August 6th
66187 - RIT1200773-'Rebase Libdfp'
Additional fixes required as per 2010-08-24
66195 - RIT1234083- DFP: strtod32/64/128 loses first decimal digit when converting numbers between 0 and 1
66196 - RIT1264143- DFP: strtod32 maps 0E+100 to inf instead to zero
66559 - RIT1281593- DFP: odd behavior of printf with DFP numbers
This feature is tested 90%
-> tests to be completed based on z.stream fixes
Set feature to verified for R6 with the limitation raised above
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.