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RE: String Functions for x86-64 (memcpy)
- From: "Menezes, Evandro" <evandro dot menezes at amd dot com>
- To: "Ulrich Drepper" <drepper at redhat dot com>, libc-alpha at sourceware dot org
- Cc: "Meissner, Michael" <michael dot meissner at amd dot com>
- Date: Fri, 19 May 2006 16:35:43 -0500
- Subject: RE: String Functions for x86-64 (memcpy)
On the left, the results for the proposed strncpy, on the right, for the current one. When the proposed strncpy is slower, a "!" is appended to a line. I filtered duplicate lines with sort.
First, on an Athlon 64:
strncpy simple_strncpy stupi strncpy simple_strncpy stupi
Length 2, n 4, alignment 7 2: 29 19 43 | Length 2, n 4, alignment 7 2: 16 19 43 !
Length 4, n 2, alignment 2 7: 14 12 44 Length 4, n 2, alignment 2 7: 14 12 44 !
Length 4, n 8, alignment 6 4: 46 44 58 | Length 4, n 8, alignment 6 4: 29 44 58 !
Length 8, n 4, alignment 4 6: 24 18 52 | Length 8, n 4, alignment 4 6: 16 18 52 !
Length 8, n 16, alignment 0 0: 41 66 74 | Length 8, n 16, alignment 0 0: 50 66 74
Length 8, n 16, alignment 5 6: 88 71 89 | Length 8, n 16, alignment 5 6: 50 71 89 !
Length 8, n 16, alignment 7 2: 85 64 82 | Length 8, n 16, alignment 7 2: 47 64 82 !
Length 16, n 8, alignment 6 5: 59 46 60 | Length 16, n 8, alignment 6 5: 25 46 60 !
Length 16, n 16, alignment 0 4: 64 74 124 | Length 16, n 16, alignment 0 4: 66 74 124
Length 16, n 16, alignment 1 1: 40 74 124 | Length 16, n 16, alignment 1 1: 44 74 124
Length 16, n 16, alignment 1 2: 47 80 133 | Length 16, n 16, alignment 1 2: 52 80 133
Length 16, n 16, alignment 2 1: 41 74 127 | Length 16, n 16, alignment 2 1: 45 74 127
Length 16, n 16, alignment 2 2: 64 68 133 | Length 16, n 16, alignment 2 2: 45 76 133 !
Length 16, n 16, alignment 2 4: 66 76 140 | Length 16, n 16, alignment 2 4: 52 76 140 !
Length 16, n 16, alignment 2 5: 66 76 145 | Length 16, n 16, alignment 2 5: 68 76 145
Length 16, n 16, alignment 3 3: 64 73 119 | Length 16, n 16, alignment 3 3: 65 73 119
Length 16, n 16, alignment 3 6: 69 76 124 | Length 16, n 16, alignment 3 6: 64 76 124 !
Length 16, n 16, alignment 4 0: 74 68 116 | Length 16, n 16, alignment 4 0: 58 68 116 !
Length 16, n 16, alignment 4 2: 77 71 122 | Length 16, n 16, alignment 4 2: 42 71 122 !
Length 16, n 16, alignment 4 4: 74 72 117 | Length 16, n 16, alignment 4 4: 65 72 117 !
Length 16, n 16, alignment 4 6: 51 80 127 | Length 16, n 16, alignment 4 6: 73 80 127
Length 16, n 16, alignment 5 2: 50 68 113 | Length 16, n 16, alignment 5 2: 61 68 113
Length 16, n 16, alignment 5 5: 50 74 114 | Length 16, n 16, alignment 5 5: 66 74 114
Length 16, n 16, alignment 6 3: 63 68 115 | Length 16, n 16, alignment 6 3: 58 68 115 !
Length 16, n 16, alignment 6 4: 63 71 110 Length 16, n 16, alignment 6 4: 63 71 110
Length 16, n 16, alignment 6 6: 63 75 110 | Length 16, n 16, alignment 6 6: 64 75 110
Length 16, n 16, alignment 6 7: 63 68 119 | Length 16, n 16, alignment 6 7: 69 82 127
Length 16, n 16, alignment 7 6: 64 68 107 | Length 16, n 16, alignment 7 6: 61 74 107 !
Length 16, n 16, alignment 7 7: 64 73 108 | Length 16, n 16, alignment 7 7: 65 73 108
Length 16, n 32, alignment 0 0: 47 126 145 | Length 16, n 32, alignment 0 0: 125 123 145
Length 16, n 32, alignment 4 0: 86 119 160 | Length 16, n 32, alignment 4 0: 119 116 160
Length 16, n 32, alignment 6 4: 88 121 156 | Length 16, n 32, alignment 6 4: 120 119 156
Length 32, n 16, alignment 0 0: 64 75 93 | Length 32, n 16, alignment 0 0: 65 72 93
Length 32, n 16, alignment 0 4: 64 76 93 | Length 32, n 16, alignment 0 4: 69 74 93
Length 32, n 16, alignment 7 2: 65 76 104 | Length 32, n 16, alignment 7 2: 61 68 97 !
Length 32, n 64, alignment 0 0: 56 211 235 | Length 32, n 64, alignment 0 0: 217 209 235
Length 32, n 64, alignment 3 2: 96 211 252 | Length 32, n 64, alignment 3 2: 207 209 252
Length 32, n 64, alignment 5 6: 103 229 265 | Length 32, n 64, alignment 5 6: 227 229 265
Length 64, n 32, alignment 0 0: 72 128 151 | Length 64, n 32, alignment 0 0: 110 128 151
Length 64, n 32, alignment 2 3: 75 135 218 | Length 64, n 32, alignment 2 3: 121 135 218
Length 64, n 32, alignment 6 4: 70 123 171 | Length 64, n 32, alignment 6 4: 100 123 171
Length 64, n 128, alignment 0 0: 76 371 431 | Length 64, n 128, alignment 0 0: 399 369 431
Length 64, n 128, alignment 2 4: 151 402 494 | Length 64, n 128, alignment 2 4: 426 402 494
Length 64, n 128, alignment 4 0: 104 356 447 | Length 64, n 128, alignment 4 0: 369 356 447
Length 128, n 64, alignment 0 0: 88 225 282 | Length 128, n 64, alignment 0 0: 195 225 282
Length 128, n 64, alignment 4 2: 84 225 298 | Length 128, n 64, alignment 4 2: 169 225 298
Length 128, n 64, alignment 5 6: 77 260 326 | Length 128, n 64, alignment 5 6: 221 260 326
Length 128, n 256, alignment 0 0: 126 691 791 | Length 128, n 256, alignment 0 0: 765 689 791
Length 128, n 256, alignment 1 6: 203 676 826 | Length 128, n 256, alignment 1 6: 778 676 826
Length 128, n 256, alignment 3 2: 152 691 810 | Length 128, n 256, alignment 3 2: 723 689 810
Length 256, n 128, alignment 0 0: 121 417 514 | Length 256, n 128, alignment 0 0: 370 417 514
Length 256, n 128, alignment 4 0: 106 404 530 | Length 256, n 128, alignment 4 0: 309 404 530
Length 256, n 128, alignment 6 1: 119 404 522 | Length 256, n 128, alignment 6 1: 309 404 522
Length 256, n 512, alignment 0 0: 203 1331 1511 | Length 256, n 512, alignment 0 0: 1495 1329 1511
Length 256, n 512, alignment 2 4: 315 1493 1672 | Length 256, n 512, alignment 2 4: 1610 1494 1672
Length 512, n 256, alignment 0 0: 202 801 978 | Length 512, n 256, alignment 0 0: 715 801 978
Length 512, n 256, alignment 3 2: 188 801 998 | Length 512, n 256, alignment 3 2: 630 801 998
Length 512, n 1024, alignment 0 0: 355 2611 2951 | Length 512, n 1024, alignment 0 0: 2945 2609 2951
Length 512, n 1024, alignment 1 6: 522 2596 2986 | Length 512, n 1024, alignment 1 6: 3018 2596 2986
Length 1024, n 512, alignment 0 0: 338 1569 1906 | Length 1024, n 512, alignment 0 0: 1398 1569 1906
Length 1024, n 512, alignment 2 4: 395 1886 2197 | Length 1024, n 512, alignment 2 4: 1638 1905 2197
Length 2048, n 1024, alignment 0 0: 610 3105 3762 | Length 2048, n 1024, alignment 0 0: 2749 3105 3762
Length 2048, n 1024, alignment 1 6: 741 3092 3802 | Length 2048, n 1024, alignment 1 6: 2915 3092 3802
Now, on a P4:
strncpy simple_strncpy stupi strncpy simple_strncpy stupi
Length 2, n 4, alignment 7 2: 8 0 40 | Length 2, n 4, alignment 7 2: 8 8 40
Length 4, n 2, alignment 2 7: 0 0 32 | Length 4, n 2, alignment 2 7: 8 8 40
Length 4, n 8, alignment 6 4: 24 32 56 | Length 4, n 8, alignment 6 4: 16 40 56 !
Length 8, n 4, alignment 4 6: 0 0 40 | Length 8, n 4, alignment 4 6: 8 8 48
Length 8, n 16, alignment 0 0: 64 64 72 | Length 8, n 16, alignment 0 0: 48 72 80 !
Length 8, n 16, alignment 5 6: 104 64 104 | Length 8, n 16, alignment 5 6: 48 72 112 !
Length 8, n 16, alignment 7 2: 104 56 80 | Length 8, n 16, alignment 7 2: 48 72 104 !
Length 16, n 8, alignment 6 5: 32 40 40 | Length 16, n 8, alignment 6 5: 8 48 48 !
Length 16, n 16, alignment 0 4: 32 112 88 | Length 16, n 16, alignment 0 4: 48 120 256
Length 16, n 16, alignment 1 1: 40 112 88 | Length 16, n 16, alignment 1 1: 48 120 96
Length 16, n 16, alignment 1 2: 40 112 104 | Length 16, n 16, alignment 1 2: 48 120 104
Length 16, n 16, alignment 2 1: 40 112 104 | Length 16, n 16, alignment 2 1: 40 120 112
Length 16, n 16, alignment 2 2: 48 112 88 | Length 16, n 16, alignment 2 2: 48 120 96
Length 16, n 16, alignment 2 4: 40 112 88 | Length 16, n 16, alignment 2 4: 48 120 96
Length 16, n 16, alignment 2 5: 96 200 216 | Length 16, n 16, alignment 2 5: 48 120 112 !
Length 16, n 16, alignment 3 3: 40 112 88 | Length 16, n 16, alignment 3 3: 48 120 88
Length 16, n 16, alignment 3 6: 40 112 88 | Length 16, n 16, alignment 3 6: 40 120 88
Length 16, n 16, alignment 4 0: 40 112 88 | Length 16, n 16, alignment 4 0: 40 120 96
Length 16, n 16, alignment 4 2: 48 112 104 | Length 16, n 16, alignment 4 2: 48 120 112
Length 16, n 16, alignment 4 4: 40 112 88 | Length 16, n 16, alignment 4 4: 48 120 96
Length 16, n 16, alignment 4 6: 40 112 112 | Length 16, n 16, alignment 4 6: 48 120 112
Length 16, n 16, alignment 5 2: 88 184 168 | Length 16, n 16, alignment 5 2: 48 120 88 !
Length 16, n 16, alignment 5 5: 96 192 168 | Length 16, n 16, alignment 5 5: 40 120 88 !
Length 16, n 16, alignment 6 3: 40 112 96 | Length 16, n 16, alignment 6 3: 40 120 104
Length 16, n 16, alignment 6 4: 48 112 88 | Length 16, n 16, alignment 6 4: 48 120 88
Length 16, n 16, alignment 6 6: 96 200 184 | Length 16, n 16, alignment 6 6: 48 120 88 !
Length 16, n 16, alignment 6 7: 40 112 112 | Length 16, n 16, alignment 6 7: 40 120 120
Length 16, n 16, alignment 7 6: 40 112 80 | Length 16, n 16, alignment 7 6: 48 120 88
Length 16, n 16, alignment 7 7: 40 112 88 | Length 16, n 16, alignment 7 7: 48 120 88
Length 16, n 32, alignment 0 0: 64 184 136 | Length 16, n 32, alignment 0 0: 104 184 136
Length 16, n 32, alignment 4 0: 112 176 136 | Length 16, n 32, alignment 4 0: 104 184 160 !
Length 16, n 32, alignment 6 4: 112 184 160 | Length 16, n 32, alignment 6 4: 96 184 152 !
Length 32, n 16, alignment 0 0: 40 112 56 | Length 32, n 16, alignment 0 0: 48 120 64
Length 32, n 16, alignment 0 4: 32 112 96 | Length 32, n 16, alignment 0 4: 48 120 64
Length 32, n 16, alignment 7 2: 40 112 64 | Length 32, n 16, alignment 7 2: 48 120 72
Length 32, n 64, alignment 0 0: 80 392 312 | Length 32, n 64, alignment 0 0: 296 368 320
Length 32, n 64, alignment 3 2: 280 576 592 | Length 32, n 64, alignment 3 2: 288 368 352
Length 32, n 64, alignment 5 6: 128 392 336 | Length 32, n 64, alignment 5 6: 312 368 352
Length 64, n 32, alignment 0 0: 56 208 144 | Length 64, n 32, alignment 0 0: 128 208 144
Length 64, n 32, alignment 2 3: 120 360 296 | Length 64, n 32, alignment 2 3: 160 208 192
Length 64, n 32, alignment 6 4: 128 200 152 | Length 64, n 32, alignment 6 4: 136 216 160
Length 64, n 128, alignment 0 0: 112 624 552 | Length 64, n 128, alignment 0 0: 520 696 552
Length 64, n 128, alignment 2 4: 144 624 568 | Length 64, n 128, alignment 2 4: 520 688 592
Length 64, n 128, alignment 4 0: 216 624 568 | Length 64, n 128, alignment 4 0: 520 688 584
Length 128, n 64, alignment 0 0: 72 392 256 | Length 128, n 64, alignment 0 0: 224 408 264
Length 128, n 64, alignment 4 2: 160 392 272 | Length 128, n 64, alignment 4 2: 224 400 272
Length 128, n 64, alignment 5 6: 80 392 280 | Length 128, n 64, alignment 5 6: 280 400 288
Length 128, n 256, alignment 0 0: 200 1200 1080 | Length 128, n 256, alignment 0 0: 968 1336 1088
Length 128, n 256, alignment 1 6: 336 1200 1096 | Length 128, n 256, alignment 1 6: 968 1328 1120
Length 128, n 256, alignment 3 2: 408 1200 1104 | Length 128, n 256, alignment 3 2: 968 1328 1112
Length 256, n 128, alignment 0 0: 136 776 520 | Length 256, n 128, alignment 0 0: 424 784 528
Length 256, n 128, alignment 4 0: 280 776 536 | Length 256, n 128, alignment 4 0: 416 792 544
Length 256, n 128, alignment 6 1: 280 776 536 | Length 256, n 128, alignment 6 1: 424 784 536
Length 256, n 512, alignment 0 0: 400 2352 2040 | Length 256, n 512, alignment 0 0: 1864 2616 2040
Length 256, n 512, alignment 2 4: 872 2352 2056 | Length 256, n 512, alignment 2 4: 1864 2360 2056
Length 512, n 256, alignment 0 0: 352 1552 968 | Length 512, n 256, alignment 0 0: 808 1560 968
Length 512, n 256, alignment 3 2: 536 1544 984 | Length 512, n 256, alignment 3 2: 808 1560 992
Length 512, n 1024, alignment 0 0: 968 4656 3960 | Length 512, n 1024, alignment 0 0: 3136 4664 3936
Length 512, n 1024, alignment 1 6: 1856 4656 3976 | Length 512, n 1024, alignment 1 6: 3144 4664 3800
Length 1024, n 512, alignment 0 0: 560 3088 1864 | Length 1024, n 512, alignment 0 0: 1568 3096 1864
Length 1024, n 512, alignment 2 4: 976 3080 1888 | Length 1024, n 512, alignment 2 4: 1576 3096 1872
Length 2048, n 1024, alignment 0 0: 1064 6160 3656 | Length 2048, n 1024, alignment 0 0: 3112 6168 3616
Length 2048, n 1024, alignment 1 6: 2000 6160 3680 | Length 2048, n 1024, alignment 1 6: 3112 6160 3304
Thanks,
--
_______________________________________________________
Evandro Menezes AMD Austin, TX