Problem with ippiNormDiff_L1_16s in IPP 8.2

Alexander_Karsakov — Tue, 30 Sep 2014 11:35:36 GMT

Hello,

I have a strange result for ippiNormDiff_L1_16s_C1R function in IPP 8.2. Code for reproducing below:

short a[21*15] = { 10, 8, 7, 2, 3, 3, 6, 2, 2, 4, 7, 10, 8, 8, 6, 7, 5, 10, 7, 7, 3, 2, 3, 2, 6, 2, 6, 2, 9, 9, 9, 2, 4,
                10, 5, 5, 9, 2, 6, 7, 9, 9, 6, 3, 10, 7, 3, 9, 2, 10, 9, 10, 8, 8, 10, 5, 10, 9, 5, 4, 4, 2, 3, 5,
                4, 9, 5, 3, 7, 8, 2, 2, 7, 9, 10, 5, 5, 10, 5, 6, 5, 6, 7, 4, 10, 10, 3, 7, 2, 10, 7, 9, 2, 4, 9, 2,
                6, 6, 6, 6, 8, 3, 7, 10, 5, 5, 2, 4, 4, 7, 8, 10, 2, 8, 4, 2, 10, 3, 6, 4, 10, 9, 6, 10, 8, 5, 7, 8,
                10, 9, 3, 8, 4, 2, 3, 5, 3, 2, 3, 7, 4, 9, 10, 9, 8, 3, 4, 4, 9, 8, 7, 4, 10, 6, 2, 5, 10, 6, 3, 5,
                5, 10, 4, 9, 8, 5, 6, 6, 8, 7, 8, 6, 3, 4, 8, 8, 2, 6, 3, 3, 9, 10, 5, 8, 10, 9, 2, 8, 6, 7, 2, 10,
                7, 2, 8, 10, 5, 6, 4, 10, 9, 3, 6, 9, 2, 9, 10, 9, 8, 10, 5, 4, 10, 5, 10, 4, 4, 7, 10, 6, 8, 4, 7,
                5, 7, 5, 9, 4, 2, 2, 8, 5, 9, 3, 7, 2, 3, 2, 3, 8, 5, 9, 4, 4, 5, 4, 9, 7, 7, 8, 7, 5, 3, 8, 3, 6, 10,
                10, 3, 6, 9, 4, 4, 9, 4, 5, 9, 9, 4, 3, 8, 4, 3, 4, 6, 6, 10, 8, 5, 3, 8, 4, 6, 7, 9, 9, 9, 4, 2, 9,
                8, 5, 2, 10, 3, 4, 10, 5, 6, 3, 6, 10, 3, 5, 5, 5, 8, 6, 7, 8, 5, 3, 2, 2, 10 };

short b[21*15] = { 1358, -1177, 167, -1533, 62, -1416, -1002, 216, -844, 970, 1228, -663, 1503, 403,
                347, 621, -760, -920, 999, 1684, 809, 1507, -1383, -860, 1043, 1539, -1332, -437,
                54, -1033, 475, 183, -1401, 77, -963, 208, 1424, 21, 1295, 285, -69, -132, -204,
                884, 154, -1467, 1004, -1366, 1461, -190, 1564, 493, -238, 495, 853, -1316, 1057,
                -1534, 1107, 72, -284, -643, -1171, 509, 116, 1112, 177, 108, -402, 1422, -219,
                1163, -848, -502, 97, -1296, -498, 18, -185, 1438, -780, -1207, 1451, 1064, 876,
                -814, -483, 716, -1408, 1693, 1030, 228, -610, 486, 1076, 1540, 848, 1384, -831,
                -865, 452, -562, -611, 429, -740, 160, -8, 220, 1421, -1193, 860, -1422, 422,
                -1519, 1641, -1512, -251, 1151, -490, 150, 246, 1119, -822, -1057, 991, 979, 571,
                -692, 1399, -32, 1306, 1542, 1568, -1095, 1346, -736, -895, 1427, 1067, 488,
                -1430, 314, -85, -808, 672, 461, 960, 1117, 993, 729, -348, 1510, 1658, 1151, 570,
                -847, 704, 1219, -1103, -1176, 1590, -991, 893, -432, -194, -719, 811, -286, 1266,
                592, 895, -1321, -1531, 1051, -1352, -1355, -1109, -37, -1300, 875, 912, -1181,
                -339, 1431, 579, -1048, 752, 314, -1416, 1070, -1111, 911, -679, 1648, 340, 751,
                -1070, 758, 261, -1365, 681, 1505, -632, 1702, 705, -1001, 925, -736, 1432, -904,
                301, -1246, -448, 1177, 342, 1500, 1015, 767, 486, -812, -970, 999, -700, 571, 452,
                512, 802, -313, 1625, -184, 830, 1175, 894, 1233, -1317, 958, 98, 974, 1289, 947,
                -1449, -206, -109, 1332, -226, -190, 1247, 725, 227, -167, 1083, -1180, 789, -697,
                -683, -1440, -283, -1, -804, -217, 927, -90, 1321, 139, -166, 1015, -14, 1583,
                -682, 373, 1504, -1248, 1456, 215, 1105, -1338, -322, -389, 682, 694, 642, 1253,
                1306, 605, 468, 1296, 669, -417, -360, -479, 551, -476, -664, -301, -1476, 1603,
                229, -43, -1280, 1668, 1550, 556, 407, 853, 1516, -665, -1324, -366, 510, 1589,
                1248, 330, 1371, 1545, -147 };

IppiSize size = { 21, 15 };
Ipp64f res1;
ippiNormDiff_L1_16s_C1R(a, 21*sizeof(short), b, 21*sizeof(short), size, &res1);

double res2 = 0;
for (int i=0; i<21*15; i++)
    res2 += abs(a - b);

printf("IPP result = %f, my result = %f\n", res1, res2);

The result is:

IPP result = 263390.000000, my result = 263381.000000

Please look at this problem.

Best regards,

Alexander.

My configuration:

Alexander_Karsakov — Tue, 30 Sep 2014 13:25:15 GMT

My configuration:

OS: Windows 7 HB
Compiler: VC 17
Processor: Intel Core i5 4570
Intel® Parallel Studio XE Composer Edition for C++ Windows, package ID: w_ccompxe_2015.0.108.

Hi Alexander,

Igor_A_Intel — Tue, 30 Sep 2014 14:23:23 GMT

Hi Alexander,

thank you for your report/finding - I've reproduced the issue - it exists only in AVX2 code version - will be fixed in the next IPP version.

regards, Igor

Hi Igor,

Alexander_Karsakov — Wed, 29 Oct 2014 15:08:40 GMT

Hi Igor,

In IPPICV 8.2.1 we still have problems with ippiNormDiff_L1_16s_C1R. Now it failed another case (code for reproducing in attachment). Could you please take a look?

Best regards,

Alexander.

Hi Alexander,

Igor_A_Intel — Wed, 29 Oct 2014 15:27:53 GMT

Hi Alexander,

got your message - will take a look and then answer - guess in 1 or 2 days.

regards, Igor

hello!

Gennady_F_Intel — Tue, 21 Apr 2015 10:09:14 GMT

hello!

the fix of the issue has been incorporated into IPP v.9.0 beta released recently. You may evaluate the beta version and let us know how it will work. Here is the output which received with this version.

ippIP AVX2 (l9 threaded) 9.0.0 Beta (r45861)
SSE :Y
SSE2 :Y
SSE3 :Y
SSSE3 :Y
SSE41 :Y
SSE42 :Y
AVX :Y
AVX2 :Y
----------
OS Enabled AVX :Y
AES :Y
CLMUL :Y
RDRAND :Y
F16C :Y
IPP = 29802861.000000, reference result = 29802861.000000
Press any key to continue . . .

topic My configuration: in Intel® Integrated Performance Primitives

Problem with ippiNormDiff_L1_16s in IPP 8.2

My configuration:

Hi Alexander,

Hi Igor,

Hi Alexander,

hello!