+------------------------------------------------------------------------
+r60 | snappy.mirrorbot@gmail.com | 2012-02-23 18:00:36 +0100 (Thu, 23 Feb 2012) | 57 lines
+
+For 32-bit platforms, do not try to accelerate multiple neighboring
+32-bit loads with a 64-bit load during compression (it's not a win).
+
+The main target for this optimization is ARM, but 32-bit x86 gets
+a small gain, too, although there is noise in the microbenchmarks.
+It's a no-op for 64-bit x86. It does not affect decompression.
+
+Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from
+Ubuntu/Linaro), -O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9
+-mthumb-interwork, minimum 1000 iterations:
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_ZFlat/0 1158277 1160000 1000 84.2MB/s html (23.57 %) [ +4.3%]
+ BM_ZFlat/1 14861782 14860000 1000 45.1MB/s urls (50.89 %) [ +1.1%]
+ BM_ZFlat/2 393595 390000 1000 310.5MB/s jpg (99.88 %) [ +0.0%]
+ BM_ZFlat/3 650583 650000 1000 138.4MB/s pdf (82.13 %) [ +3.1%]
+ BM_ZFlat/4 4661480 4660000 1000 83.8MB/s html4 (23.55 %) [ +4.3%]
+ BM_ZFlat/5 491973 490000 1000 47.9MB/s cp (48.12 %) [ +2.0%]
+ BM_ZFlat/6 193575 192678 1038 55.2MB/s c (42.40 %) [ +9.0%]
+ BM_ZFlat/7 62343 62754 3187 56.5MB/s lsp (48.37 %) [ +2.6%]
+ BM_ZFlat/8 17708468 17710000 1000 55.5MB/s xls (41.34 %) [ -0.3%]
+ BM_ZFlat/9 3755345 3760000 1000 38.6MB/s txt1 (59.81 %) [ +8.2%]
+ BM_ZFlat/10 3324217 3320000 1000 36.0MB/s txt2 (64.07 %) [ +4.2%]
+ BM_ZFlat/11 10139932 10140000 1000 40.1MB/s txt3 (57.11 %) [ +6.4%]
+ BM_ZFlat/12 13532109 13530000 1000 34.0MB/s txt4 (68.35 %) [ +5.0%]
+ BM_ZFlat/13 4690847 4690000 1000 104.4MB/s bin (18.21 %) [ +4.1%]
+ BM_ZFlat/14 830682 830000 1000 43.9MB/s sum (51.88 %) [ +1.2%]
+ BM_ZFlat/15 84784 85011 2235 47.4MB/s man (59.36 %) [ +1.1%]
+ BM_ZFlat/16 1293254 1290000 1000 87.7MB/s pb (23.15 %) [ +2.3%]
+ BM_ZFlat/17 2775155 2780000 1000 63.2MB/s gaviota (38.27 %) [+12.2%]
+
+Core i7 in 32-bit mode (only one run and 100 iterations, though, so noisy):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ ---------------------------------------------------
+ BM_ZFlat/0 227582 223464 3043 437.0MB/s html (23.57 %) [ +7.4%]
+ BM_ZFlat/1 2982430 2918455 233 229.4MB/s urls (50.89 %) [ +2.9%]
+ BM_ZFlat/2 46967 46658 15217 2.5GB/s jpg (99.88 %) [ +0.0%]
+ BM_ZFlat/3 115298 114864 5833 783.2MB/s pdf (82.13 %) [ +1.5%]
+ BM_ZFlat/4 913440 899743 778 434.2MB/s html4 (23.55 %) [ +0.3%]
+ BM_ZFlat/5 110302 108571 7000 216.1MB/s cp (48.12 %) [ +0.0%]
+ BM_ZFlat/6 44409 43372 15909 245.2MB/s c (42.40 %) [ +0.8%]
+ BM_ZFlat/7 15713 15643 46667 226.9MB/s lsp (48.37 %) [ +2.7%]
+ BM_ZFlat/8 2625539 2602230 269 377.4MB/s xls (41.34 %) [ +1.4%]
+ BM_ZFlat/9 808884 811429 875 178.8MB/s txt1 (59.81 %) [ -3.9%]
+ BM_ZFlat/10 709532 700000 1000 170.5MB/s txt2 (64.07 %) [ +0.0%]
+ BM_ZFlat/11 2177682 2162162 333 188.2MB/s txt3 (57.11 %) [ -1.4%]
+ BM_ZFlat/12 2849640 2840000 250 161.8MB/s txt4 (68.35 %) [ -1.4%]
+ BM_ZFlat/13 849760 835476 778 585.8MB/s bin (18.21 %) [ +1.2%]
+ BM_ZFlat/14 165940 164571 4375 221.6MB/s sum (51.88 %) [ +1.4%]
+ BM_ZFlat/15 20939 20571 35000 196.0MB/s man (59.36 %) [ +2.1%]
+ BM_ZFlat/16 239209 236544 2917 478.1MB/s pb (23.15 %) [ +4.2%]
+ BM_ZFlat/17 616206 610000 1000 288.2MB/s gaviota (38.27 %) [ -1.6%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r59 | snappy.mirrorbot@gmail.com | 2012-02-21 18:02:17 +0100 (Tue, 21 Feb 2012) | 107 lines
+
+Enable the use of unaligned loads and stores for ARM-based architectures
+where they are available (ARMv7 and higher). This gives a significant
+speed boost on ARM, both for compression and decompression.
+It should not affect x86 at all.
+
+There are more changes possible to speed up ARM, but it might not be
+that easy to do without hurting x86 or making the code uglier.
+Also, we de not try to use NEON yet.
+
+Microbenchmark results on a Cortex-A9 1GHz, using g++ 4.6.2 (from Ubuntu/Linaro),
+-O2 -DNDEBUG -Wa,-march=armv7a -mtune=cortex-a9 -mthumb-interwork:
+
+Benchmark Time(ns) CPU(ns) Iterations
+---------------------------------------------------
+BM_UFlat/0 524806 529100 378 184.6MB/s html [+33.6%]
+BM_UFlat/1 5139790 5200000 100 128.8MB/s urls [+28.8%]
+BM_UFlat/2 86540 84166 1901 1.4GB/s jpg [ +0.6%]
+BM_UFlat/3 215351 210176 904 428.0MB/s pdf [+29.8%]
+BM_UFlat/4 2144490 2100000 100 186.0MB/s html4 [+33.3%]
+BM_UFlat/5 194482 190000 1000 123.5MB/s cp [+36.2%]
+BM_UFlat/6 91843 90175 2107 117.9MB/s c [+38.6%]
+BM_UFlat/7 28535 28426 6684 124.8MB/s lsp [+34.7%]
+BM_UFlat/8 9206600 9200000 100 106.7MB/s xls [+42.4%]
+BM_UFlat/9 1865273 1886792 106 76.9MB/s txt1 [+32.5%]
+BM_UFlat/10 1576809 1587301 126 75.2MB/s txt2 [+32.3%]
+BM_UFlat/11 4968450 4900000 100 83.1MB/s txt3 [+32.7%]
+BM_UFlat/12 6673970 6700000 100 68.6MB/s txt4 [+32.8%]
+BM_UFlat/13 2391470 2400000 100 203.9MB/s bin [+29.2%]
+BM_UFlat/14 334601 344827 522 105.8MB/s sum [+30.6%]
+BM_UFlat/15 37404 38080 5252 105.9MB/s man [+33.8%]
+BM_UFlat/16 535470 540540 370 209.2MB/s pb [+31.2%]
+BM_UFlat/17 1875245 1886792 106 93.2MB/s gaviota [+37.8%]
+BM_UValidate/0 178425 179533 1114 543.9MB/s html [ +2.7%]
+BM_UValidate/1 2100450 2000000 100 334.8MB/s urls [ +5.0%]
+BM_UValidate/2 1039 1044 172413 113.3GB/s jpg [ +3.4%]
+BM_UValidate/3 59423 59470 3363 1.5GB/s pdf [ +7.8%]
+BM_UValidate/4 760716 766283 261 509.8MB/s html4 [ +6.5%]
+BM_ZFlat/0 1204632 1204819 166 81.1MB/s html (23.57 %) [+32.8%]
+BM_ZFlat/1 15656190 15600000 100 42.9MB/s urls (50.89 %) [+27.6%]
+BM_ZFlat/2 403336 410677 487 294.8MB/s jpg (99.88 %) [+16.5%]
+BM_ZFlat/3 664073 671140 298 134.0MB/s pdf (82.13 %) [+28.4%]
+BM_ZFlat/4 4961940 4900000 100 79.7MB/s html4 (23.55 %) [+30.6%]
+BM_ZFlat/5 500664 501253 399 46.8MB/s cp (48.12 %) [+33.4%]
+BM_ZFlat/6 217276 215982 926 49.2MB/s c (42.40 %) [+25.0%]
+BM_ZFlat/7 64122 65487 3054 54.2MB/s lsp (48.37 %) [+36.1%]
+BM_ZFlat/8 18045730 18000000 100 54.6MB/s xls (41.34 %) [+34.4%]
+BM_ZFlat/9 4051530 4000000 100 36.3MB/s txt1 (59.81 %) [+25.0%]
+BM_ZFlat/10 3451800 3500000 100 34.1MB/s txt2 (64.07 %) [+25.7%]
+BM_ZFlat/11 11052340 11100000 100 36.7MB/s txt3 (57.11 %) [+24.3%]
+BM_ZFlat/12 14538690 14600000 100 31.5MB/s txt4 (68.35 %) [+24.7%]
+BM_ZFlat/13 5041850 5000000 100 97.9MB/s bin (18.21 %) [+32.0%]
+BM_ZFlat/14 908840 909090 220 40.1MB/s sum (51.88 %) [+22.2%]
+BM_ZFlat/15 86921 86206 1972 46.8MB/s man (59.36 %) [+42.2%]
+BM_ZFlat/16 1312315 1315789 152 86.0MB/s pb (23.15 %) [+34.5%]
+BM_ZFlat/17 3173120 3200000 100 54.9MB/s gaviota (38.27%) [+28.1%]
+
+
+The move from 64-bit to 32-bit operations for the copies also affected 32-bit x86;
+positive on the decompression side, and slightly negative on the compression side
+(unless that is noise; I only ran once):
+
+Benchmark Time(ns) CPU(ns) Iterations
+-----------------------------------------------------
+BM_UFlat/0 86279 86140 7778 1.1GB/s html [ +7.5%]
+BM_UFlat/1 839265 822622 778 813.9MB/s urls [ +9.4%]
+BM_UFlat/2 9180 9143 87500 12.9GB/s jpg [ +1.2%]
+BM_UFlat/3 35080 35000 20000 2.5GB/s pdf [+10.1%]
+BM_UFlat/4 350318 345000 2000 1.1GB/s html4 [ +7.0%]
+BM_UFlat/5 33808 33472 21212 701.0MB/s cp [ +9.0%]
+BM_UFlat/6 15201 15214 46667 698.9MB/s c [+14.9%]
+BM_UFlat/7 4652 4651 159091 762.9MB/s lsp [ +7.5%]
+BM_UFlat/8 1285551 1282528 538 765.7MB/s xls [+10.7%]
+BM_UFlat/9 282510 281690 2414 514.9MB/s txt1 [+13.6%]
+BM_UFlat/10 243494 239286 2800 498.9MB/s txt2 [+14.4%]
+BM_UFlat/11 743625 740000 1000 550.0MB/s txt3 [+14.3%]
+BM_UFlat/12 999441 989717 778 464.3MB/s txt4 [+16.1%]
+BM_UFlat/13 412402 410076 1707 1.2GB/s bin [ +7.3%]
+BM_UFlat/14 54876 54000 10000 675.3MB/s sum [+13.0%]
+BM_UFlat/15 6146 6100 100000 660.8MB/s man [+14.8%]
+BM_UFlat/16 90496 90286 8750 1.2GB/s pb [ +4.0%]
+BM_UFlat/17 292650 292000 2500 602.0MB/s gaviota [+18.1%]
+BM_UValidate/0 49620 49699 14286 1.9GB/s html [ +0.0%]
+BM_UValidate/1 501371 500000 1000 1.3GB/s urls [ +0.0%]
+BM_UValidate/2 232 227 3043478 521.5GB/s jpg [ +1.3%]
+BM_UValidate/3 17250 17143 43750 5.1GB/s pdf [ -1.3%]
+BM_UValidate/4 198643 200000 3500 1.9GB/s html4 [ -0.9%]
+BM_ZFlat/0 227128 229415 3182 425.7MB/s html (23.57 %) [ -1.4%]
+BM_ZFlat/1 2970089 2960000 250 226.2MB/s urls (50.89 %) [ -1.9%]
+BM_ZFlat/2 45683 44999 15556 2.6GB/s jpg (99.88 %) [ +2.2%]
+BM_ZFlat/3 114661 113136 6364 795.1MB/s pdf (82.13 %) [ -1.5%]
+BM_ZFlat/4 919702 914286 875 427.2MB/s html4 (23.55%) [ -1.3%]
+BM_ZFlat/5 108189 108422 6364 216.4MB/s cp (48.12 %) [ -1.2%]
+BM_ZFlat/6 44525 44000 15909 241.7MB/s c (42.40 %) [ -2.9%]
+BM_ZFlat/7 15973 15857 46667 223.8MB/s lsp (48.37 %) [ +0.0%]
+BM_ZFlat/8 2677888 2639405 269 372.1MB/s xls (41.34 %) [ -1.4%]
+BM_ZFlat/9 800715 780000 1000 186.0MB/s txt1 (59.81 %) [ -0.4%]
+BM_ZFlat/10 700089 700000 1000 170.5MB/s txt2 (64.07 %) [ -2.9%]
+BM_ZFlat/11 2159356 2138365 318 190.3MB/s txt3 (57.11 %) [ -0.3%]
+BM_ZFlat/12 2796143 2779923 259 165.3MB/s txt4 (68.35 %) [ -1.4%]
+BM_ZFlat/13 856458 835476 778 585.8MB/s bin (18.21 %) [ -0.1%]
+BM_ZFlat/14 166908 166857 4375 218.6MB/s sum (51.88 %) [ -1.4%]
+BM_ZFlat/15 21181 20857 35000 193.3MB/s man (59.36 %) [ -0.8%]
+BM_ZFlat/16 244009 239973 2917 471.3MB/s pb (23.15 %) [ -1.4%]
+BM_ZFlat/17 596362 590000 1000 297.9MB/s gaviota (38.27%) [ +0.0%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r58 | snappy.mirrorbot@gmail.com | 2012-02-11 23:11:22 +0100 (Sat, 11 Feb 2012) | 9 lines
+
+Lower the size allocated in the "corrupted input" unit test from 256 MB
+to 2 MB. This fixes issues with running the unit test on platforms with
+little RAM (e.g. some ARM boards).
+
+Also, reactivate the 2 MB test for 64-bit platforms; there's no good
+reason why it shouldn't be.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r57 | snappy.mirrorbot@gmail.com | 2012-01-08 18:55:48 +0100 (Sun, 08 Jan 2012) | 2 lines
+
+Minor refactoring to accomodate changes in Google's internal code tree.
+
+------------------------------------------------------------------------
+r56 | snappy.mirrorbot@gmail.com | 2012-01-04 14:10:46 +0100 (Wed, 04 Jan 2012) | 19 lines
+
+Fix public issue r57: Fix most warnings with -Wall, mostly signed/unsigned
+warnings. There are still some in the unit test, but the main .cc file should
+be clean. We haven't enabled -Wall for the default build, since the unit test
+is still not clean.
+
+This also fixes a real bug in the open-source implementation of
+ReadFileToStringOrDie(); it would not detect errors correctly.
+
+I had to go through some pains to avoid performance loss as the types
+were changed; I think there might still be some with 32-bit if and only if LFS
+is enabled (ie., size_t is 64-bit), but for regular 32-bit and 64-bit I can't
+see any losses, and I've diffed the generated GCC assembler between the old and
+new code without seeing any significant choices. If anything, it's ever so
+slightly faster.
+
+This may or may not enable compression of very large blocks (>2^32 bytes)
+when size_t is 64-bit, but I haven't checked, and it is still not a supported
+case.
+
+------------------------------------------------------------------------
+r55 | snappy.mirrorbot@gmail.com | 2012-01-04 11:46:39 +0100 (Wed, 04 Jan 2012) | 6 lines
+
+Add a framing format description. We do not have any implementation of this at
+the current point, but there seems to be enough of a general interest in the
+topic (cf. public bug #34).
+
+R=csilvers,sanjay
+
+------------------------------------------------------------------------
+r54 | snappy.mirrorbot@gmail.com | 2011-12-05 22:27:26 +0100 (Mon, 05 Dec 2011) | 81 lines
+
+Speed up decompression by moving the refill check to the end of the loop.
+
+This seems to work because in most of the branches, the compiler can evaluate
+“ip_limit_ - ip” in a more efficient way than reloading ip_limit_ from memory
+(either by already having the entire expression in a register, or reconstructing
+it from “avail”, or something else). Memory loads, even from L1, are seemingly
+costly in the big picture at the current decompression speeds.
+
+Microbenchmarks (64-bit, opt mode):
+
+Westmere (Intel Core i7):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 74492 74491 187894 1.3GB/s html [ +5.9%]
+ BM_UFlat/1 712268 712263 19644 940.0MB/s urls [ +3.8%]
+ BM_UFlat/2 10591 10590 1000000 11.2GB/s jpg [ -6.8%]
+ BM_UFlat/3 29643 29643 469915 3.0GB/s pdf [ +7.9%]
+ BM_UFlat/4 304669 304667 45930 1.3GB/s html4 [ +4.8%]
+ BM_UFlat/5 28508 28507 490077 823.1MB/s cp [ +4.0%]
+ BM_UFlat/6 12415 12415 1000000 856.5MB/s c [ +8.6%]
+ BM_UFlat/7 3415 3415 4084723 1039.0MB/s lsp [+18.0%]
+ BM_UFlat/8 979569 979563 14261 1002.5MB/s xls [ +5.8%]
+ BM_UFlat/9 230150 230148 60934 630.2MB/s txt1 [ +5.2%]
+ BM_UFlat/10 197167 197166 71135 605.5MB/s txt2 [ +4.7%]
+ BM_UFlat/11 607394 607390 23041 670.1MB/s txt3 [ +5.6%]
+ BM_UFlat/12 808502 808496 17316 568.4MB/s txt4 [ +5.0%]
+ BM_UFlat/13 372791 372788 37564 1.3GB/s bin [ +3.3%]
+ BM_UFlat/14 44541 44541 313969 818.8MB/s sum [ +5.7%]
+ BM_UFlat/15 4833 4833 2898697 834.1MB/s man [ +4.8%]
+ BM_UFlat/16 79855 79855 175356 1.4GB/s pb [ +4.8%]
+ BM_UFlat/17 245845 245843 56838 715.0MB/s gaviota [ +5.8%]
+
+Clovertown (Intel Core 2):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 107911 107890 100000 905.1MB/s html [ +2.2%]
+ BM_UFlat/1 1011237 1011041 10000 662.3MB/s urls [ +2.5%]
+ BM_UFlat/2 26775 26770 523089 4.4GB/s jpg [ +0.0%]
+ BM_UFlat/3 48103 48095 290618 1.8GB/s pdf [ +3.4%]
+ BM_UFlat/4 437724 437644 31937 892.6MB/s html4 [ +2.1%]
+ BM_UFlat/5 39607 39600 358284 592.5MB/s cp [ +2.4%]
+ BM_UFlat/6 18227 18224 768191 583.5MB/s c [ +2.7%]
+ BM_UFlat/7 5171 5170 2709437 686.4MB/s lsp [ +3.9%]
+ BM_UFlat/8 1560291 1559989 8970 629.5MB/s xls [ +3.6%]
+ BM_UFlat/9 335401 335343 41731 432.5MB/s txt1 [ +3.0%]
+ BM_UFlat/10 287014 286963 48758 416.0MB/s txt2 [ +2.8%]
+ BM_UFlat/11 888522 888356 15752 458.1MB/s txt3 [ +2.9%]
+ BM_UFlat/12 1186600 1186378 10000 387.3MB/s txt4 [ +3.1%]
+ BM_UFlat/13 572295 572188 24468 855.4MB/s bin [ +2.1%]
+ BM_UFlat/14 64060 64049 218401 569.4MB/s sum [ +4.1%]
+ BM_UFlat/15 7264 7263 1916168 555.0MB/s man [ +1.4%]
+ BM_UFlat/16 108853 108836 100000 1039.1MB/s pb [ +1.7%]
+ BM_UFlat/17 364289 364223 38419 482.6MB/s gaviota [ +4.9%]
+
+Barcelona (AMD Opteron):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 103900 103871 100000 940.2MB/s html [ +8.3%]
+ BM_UFlat/1 1000435 1000107 10000 669.5MB/s urls [ +6.6%]
+ BM_UFlat/2 24659 24652 567362 4.8GB/s jpg [ +0.1%]
+ BM_UFlat/3 48206 48193 291121 1.8GB/s pdf [ +5.0%]
+ BM_UFlat/4 421980 421850 33174 926.0MB/s html4 [ +7.3%]
+ BM_UFlat/5 40368 40357 346994 581.4MB/s cp [ +8.7%]
+ BM_UFlat/6 19836 19830 708695 536.2MB/s c [ +8.0%]
+ BM_UFlat/7 6100 6098 2292774 581.9MB/s lsp [ +9.0%]
+ BM_UFlat/8 1693093 1692514 8261 580.2MB/s xls [ +8.0%]
+ BM_UFlat/9 365991 365886 38225 396.4MB/s txt1 [ +7.1%]
+ BM_UFlat/10 311330 311238 44950 383.6MB/s txt2 [ +7.6%]
+ BM_UFlat/11 975037 974737 14376 417.5MB/s txt3 [ +6.9%]
+ BM_UFlat/12 1303558 1303175 10000 352.6MB/s txt4 [ +7.3%]
+ BM_UFlat/13 517448 517290 27144 946.2MB/s bin [ +5.5%]
+ BM_UFlat/14 66537 66518 210352 548.3MB/s sum [ +7.5%]
+ BM_UFlat/15 7976 7974 1760383 505.6MB/s man [ +5.6%]
+ BM_UFlat/16 103121 103092 100000 1097.0MB/s pb [ +8.7%]
+ BM_UFlat/17 391431 391314 35733 449.2MB/s gaviota [ +6.5%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r53 | snappy.mirrorbot@gmail.com | 2011-11-23 12:14:17 +0100 (Wed, 23 Nov 2011) | 88 lines
+
+Speed up decompression by making the fast path for literals faster.
+
+We do the fast-path step as soon as possible; in fact, as soon as we know the
+literal length. Since we usually hit the fast path, we can then skip the checks
+for long literals and available input space (beyond what the fast path check
+already does).
+
+Note that this changes the decompression Writer API; however, it does not
+change the ABI, since writers are always templatized and as such never
+cross compilation units. The new API is slightly more general, in that it
+doesn't hard-code the value 16. Note that we also take care to check
+for len <= 16 first, since the other two checks almost always succeed
+(so we don't want to waste time checking for them until we have to).
+
+The improvements are most marked on Nehalem, but are generally positive
+on other platforms as well. All microbenchmarks are 64-bit, opt.
+
+Clovertown (Core 2):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 110226 110224 100000 886.0MB/s html [ +1.5%]
+ BM_UFlat/1 1036523 1036508 10000 646.0MB/s urls [ -0.8%]
+ BM_UFlat/2 26775 26775 522570 4.4GB/s jpg [ +0.0%]
+ BM_UFlat/3 49738 49737 280974 1.8GB/s pdf [ +0.3%]
+ BM_UFlat/4 446790 446792 31334 874.3MB/s html4 [ +0.8%]
+ BM_UFlat/5 40561 40562 350424 578.5MB/s cp [ +1.3%]
+ BM_UFlat/6 18722 18722 746903 568.0MB/s c [ +1.4%]
+ BM_UFlat/7 5373 5373 2608632 660.5MB/s lsp [ +8.3%]
+ BM_UFlat/8 1615716 1615718 8670 607.8MB/s xls [ +2.0%]
+ BM_UFlat/9 345278 345281 40481 420.1MB/s txt1 [ +1.4%]
+ BM_UFlat/10 294855 294855 47452 404.9MB/s txt2 [ +1.6%]
+ BM_UFlat/11 914263 914263 15316 445.2MB/s txt3 [ +1.1%]
+ BM_UFlat/12 1222694 1222691 10000 375.8MB/s txt4 [ +1.4%]
+ BM_UFlat/13 584495 584489 23954 837.4MB/s bin [ -0.6%]
+ BM_UFlat/14 66662 66662 210123 547.1MB/s sum [ +1.2%]
+ BM_UFlat/15 7368 7368 1881856 547.1MB/s man [ +4.0%]
+ BM_UFlat/16 110727 110726 100000 1021.4MB/s pb [ +2.3%]
+ BM_UFlat/17 382138 382141 36616 460.0MB/s gaviota [ -0.7%]
+
+Westmere (Core i7):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 78861 78853 177703 1.2GB/s html [ +2.1%]
+ BM_UFlat/1 739560 739491 18912 905.4MB/s urls [ +3.4%]
+ BM_UFlat/2 9867 9866 1419014 12.0GB/s jpg [ +3.4%]
+ BM_UFlat/3 31989 31986 438385 2.7GB/s pdf [ +0.2%]
+ BM_UFlat/4 319406 319380 43771 1.2GB/s html4 [ +1.9%]
+ BM_UFlat/5 29639 29636 472862 791.7MB/s cp [ +5.2%]
+ BM_UFlat/6 13478 13477 1000000 789.0MB/s c [ +2.3%]
+ BM_UFlat/7 4030 4029 3475364 880.7MB/s lsp [ +8.7%]
+ BM_UFlat/8 1036585 1036492 10000 947.5MB/s xls [ +6.9%]
+ BM_UFlat/9 242127 242105 57838 599.1MB/s txt1 [ +3.0%]
+ BM_UFlat/10 206499 206480 67595 578.2MB/s txt2 [ +3.4%]
+ BM_UFlat/11 641635 641570 21811 634.4MB/s txt3 [ +2.4%]
+ BM_UFlat/12 848847 848769 16443 541.4MB/s txt4 [ +3.1%]
+ BM_UFlat/13 384968 384938 36366 1.2GB/s bin [ +0.3%]
+ BM_UFlat/14 47106 47101 297770 774.3MB/s sum [ +4.4%]
+ BM_UFlat/15 5063 5063 2772202 796.2MB/s man [ +7.7%]
+ BM_UFlat/16 83663 83656 167697 1.3GB/s pb [ +1.8%]
+ BM_UFlat/17 260224 260198 53823 675.6MB/s gaviota [ -0.5%]
+
+Barcelona (Opteron):
+
+ Benchmark Time(ns) CPU(ns) Iterations
+ --------------------------------------------
+ BM_UFlat/0 112490 112457 100000 868.4MB/s html [ -0.4%]
+ BM_UFlat/1 1066719 1066339 10000 627.9MB/s urls [ +1.0%]
+ BM_UFlat/2 24679 24672 563802 4.8GB/s jpg [ +0.7%]
+ BM_UFlat/3 50603 50589 277285 1.7GB/s pdf [ +2.6%]
+ BM_UFlat/4 452982 452849 30900 862.6MB/s html4 [ -0.2%]
+ BM_UFlat/5 43860 43848 319554 535.1MB/s cp [ +1.2%]
+ BM_UFlat/6 21419 21413 653573 496.6MB/s c [ +1.0%]
+ BM_UFlat/7 6646 6645 2105405 534.1MB/s lsp [ +0.3%]
+ BM_UFlat/8 1828487 1827886 7658 537.3MB/s xls [ +2.6%]
+ BM_UFlat/9 391824 391714 35708 370.3MB/s txt1 [ +2.2%]
+ BM_UFlat/10 334913 334816 41885 356.6MB/s txt2 [ +1.7%]
+ BM_UFlat/11 1042062 1041674 10000 390.7MB/s txt3 [ +1.1%]
+ BM_UFlat/12 1398902 1398456 10000 328.6MB/s txt4 [ +1.7%]
+ BM_UFlat/13 545706 545530 25669 897.2MB/s bin [ -0.4%]
+ BM_UFlat/14 71512 71505 196035 510.0MB/s sum [ +1.4%]
+ BM_UFlat/15 8422 8421 1665036 478.7MB/s man [ +2.6%]
+ BM_UFlat/16 112053 112048 100000 1009.3MB/s pb [ -0.4%]
+ BM_UFlat/17 416723 416713 33612 421.8MB/s gaviota [ -2.0%]
+
+R=sanjay
+
+------------------------------------------------------------------------
+r52 | snappy.mirrorbot@gmail.com | 2011-11-08 15:46:39 +0100 (Tue, 08 Nov 2011) | 5 lines
+
+Fix public issue #53: Update the README to the API we actually open-sourced
+with.
+
+R=sanjay
+
+------------------------------------------------------------------------
+r51 | snappy.mirrorbot@gmail.com | 2011-10-05 14:27:12 +0200 (Wed, 05 Oct 2011) | 5 lines
+
+In the format description, use a clearer example to emphasize that varints are
+stored in little-endian. Patch from Christian von Roques.
+
+R=csilvers
+
+------------------------------------------------------------------------
+r50 | snappy.mirrorbot@gmail.com | 2011-09-15 21:34:06 +0200 (Thu, 15 Sep 2011) | 4 lines
+
+Release Snappy 1.0.4.
+
+R=sanjay
+
------------------------------------------------------------------------
r49 | snappy.mirrorbot@gmail.com | 2011-09-15 11:50:05 +0200 (Thu, 15 Sep 2011) | 5 lines
state of ip_ after decompression (or attempted decompresion) is
completely irrelevant, so we don't need the trailer.
-Performance is, as expected, mostly flat -- there's a curious ~3–5%
-loss in the “lsp” test, but that test case is so short it is hard to say
+Performance is, as expected, mostly flat -- there's a curious ~3-5%
+loss in the "lsp" test, but that test case is so short it is hard to say
anything definitive about why (most likely, it's some sort of
unrelated effect).
before it saves ip_ back and returns. (Note that Step() was already inlined,
so it is not the manual inlining that buys the performance here.)
-The wins are about 3–6% for Core 2, 6–13% on Core i7 and 5–12% on Opteron
+The wins are about 3-6% for Core 2, 6-13% on Core i7 and 5-12% on Opteron
(for plain array-to-array decompression, in 64-bit opt mode).
There is a tiny difference in the behavior here; if an invalid literal is
projects / apitrace / blobdiff