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[Bug math/19003] New: [x86_64] fma4 version of pow inappropriate contraction
- From: "jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 24 Sep 2015 16:44:33 +0000
- Subject: [Bug math/19003] New: [x86_64] fma4 version of pow inappropriate contraction
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=19003
Bug ID: 19003
Summary: [x86_64] fma4 version of pow inappropriate contraction
Product: glibc
Version: 2.22
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-*-*
The x86_64 fma4 version of pow fails to disable contraction of operations other
than those explicitly intended to use fma instructions, so resulting in large
ulps errors on processors with fma4 instructions, as in bug 18104 (165ulp for
the test added for that bug).
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