From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 78163] New: Opencl app with multiprecision math return wrong results Date: Thu, 01 May 2014 17:19:03 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0316375264==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 508176EDE4 for ; Thu, 1 May 2014 10:19:03 -0700 (PDT) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0316375264== Content-Type: multipart/alternative; boundary="1398964743.a345051e0.16618"; charset="us-ascii" --1398964743.a345051e0.16618 Date: Thu, 1 May 2014 17:19:03 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=78163 Priority: medium Bug ID: 78163 Assignee: dri-devel@lists.freedesktop.org Summary: Opencl app with multiprecision math return wrong results Severity: normal Classification: Unclassified OS: Linux (All) Reporter: alexxy@gentoo.org Hardware: x86-64 (AMD64) Status: NEW Version: git Component: Drivers/Gallium/r600 Product: Mesa Opencl app that uses multiprecision math gives wrong results App is https://github.com/eXtremal-ik7/xpmminer $ ./xpmclminer -b --opencl-platform Mesa OpenCL platform available: Mesa 8 warnings generated. 8 warnings generated. [0] AMD TURKS; 1 compute units [1] AMD TURKS; 1 compute units * GPU 1 benchmark start: Multiply 256 bits CPU time: 4.868, GPU time: 4.131 (1.178 times faster) element index: 0 gmp: 79016B22 1C710C4A DF86F5C0 18E693EF D677434D 28B50A0A 4A2F8F5E 6FF1E1A6 C17B67E2 77B8CB65 8BA0DF48 3CD297F7 AD74948C 6B99D76B 8A81F331 DF8A45CB 8869E036 825665FF 9505CD30 543C80C6 96E3B1A5 72CE6A4A CEA9324B 7C37E23C gpu: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 results differ! Multiply 384 bits CPU time: 9.280, GPU time: 15.885 (0.584 times faster) -- You are receiving this mail because: You are the assignee for the bug. --1398964743.a345051e0.16618 Date: Thu, 1 May 2014 17:19:03 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"
Priority medium
Bug ID 78163
Assignee dri-devel@lists.freedesktop.org
Summary Opencl app with multiprecision math return wrong results
Severity normal
Classification Unclassified
OS Linux (All)
Reporter alexxy@gentoo.org
Hardware x86-64 (AMD64)
Status NEW
Version git
Component Drivers/Gallium/r600
Product Mesa 

Opencl app that uses multiprecision math gives wrong results

App is https://github.com/eXtremal-ik7/xpmminer


$ ./xpmclminer -b --opencl-platform Mesa
OpenCL platform available: Mesa
8 warnings generated.
8 warnings generated.
[0] AMD TURKS; 1 compute units
[1] AMD TURKS; 1 compute units
 * GPU 1 benchmark start:
Multiply 256 bits CPU time: 4.868, GPU time: 4.131 (1.178 times faster)
element index: 0
gmp: 79016B22 1C710C4A DF86F5C0 18E693EF D677434D 28B50A0A 4A2F8F5E 6FF1E1A6
C17B67E2 77B8CB65 8BA0DF48 3CD297F7 AD74948C 6B99D76B 8A81F331 DF8A45CB
8869E036 825665FF 9505CD30 543C80C6 96E3B1A5 72CE6A4A CEA9324B 7C37E23C 
gpu: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
results differ!
Multiply 384 bits CPU time: 9.280, GPU time: 15.885 (0.584 times faster)

You are receiving this mail because:
  • You are the assignee for the bug.
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