Write the encoder's extendMatch in asm.
name old speed new speed delta
WordsEncode1e1-8 678MB/s ± 0% 690MB/s ± 0% +1.79% (p=0.008 n=5+5)
WordsEncode1e2-8 87.5MB/s ± 0% 83.7MB/s ± 1% -4.26% (p=0.008 n=5+5)
WordsEncode1e3-8 257MB/s ± 1% 230MB/s ± 1% -10.41% (p=0.008 n=5+5)
WordsEncode1e4-8 247MB/s ± 1% 233MB/s ± 1% -5.56% (p=0.008 n=5+5)
WordsEncode1e5-8 186MB/s ± 0% 212MB/s ± 0% +14.36% (p=0.008 n=5+5)
WordsEncode1e6-8 211MB/s ± 0% 255MB/s ± 0% +20.82% (p=0.008 n=5+5)
RandomEncode-8 13.1GB/s ± 2% 13.2GB/s ± 1% ~ (p=0.222 n=5+5)
_ZFlat0-8 433MB/s ± 0% 623MB/s ± 0% +43.92% (p=0.008 n=5+5)
_ZFlat1-8 276MB/s ± 0% 319MB/s ± 1% +15.42% (p=0.008 n=5+5)
_ZFlat2-8 13.8GB/s ± 1% 13.9GB/s ± 1% ~ (p=0.222 n=5+5)
_ZFlat3-8 170MB/s ± 0% 176MB/s ± 0% +3.55% (p=0.008 n=5+5)
_ZFlat4-8 3.09GB/s ± 1% 6.05GB/s ± 0% +96.00% (p=0.008 n=5+5)
_ZFlat5-8 427MB/s ± 1% 603MB/s ± 0% +41.35% (p=0.008 n=5+5)
_ZFlat6-8 190MB/s ± 0% 228MB/s ± 0% +20.24% (p=0.008 n=5+5)
_ZFlat7-8 182MB/s ± 0% 212MB/s ± 0% +16.87% (p=0.008 n=5+5)
_ZFlat8-8 200MB/s ± 0% 242MB/s ± 0% +20.97% (p=0.008 n=5+5)
_ZFlat9-8 175MB/s ± 0% 199MB/s ± 1% +13.74% (p=0.008 n=5+5)
_ZFlat10-8 507MB/s ± 0% 796MB/s ± 1% +56.83% (p=0.008 n=5+5)
_ZFlat11-8 278MB/s ± 0% 348MB/s ± 0% +25.09% (p=0.008 n=5+5)
name old time/op new time/op delta
ExtendMatch-8 16.5µs ± 1% 7.8µs ± 1% -52.93% (p=0.008 n=5+5)
diff --git a/decode_amd64.s b/decode_amd64.s
index 030cafc..ed1e93b 100644
--- a/decode_amd64.s
+++ b/decode_amd64.s
@@ -8,10 +8,10 @@
#include "textflag.h"
-// func decode(dst, src []byte) int
-//
// The asm code generally follows the pure Go code in decode_other.go, except
// where marked with a "!!!".
+
+// func decode(dst, src []byte) int
//
// All local variables fit into registers. The non-zero stack size is only to
// spill registers and push args when issuing a CALL. The register allocation:
diff --git a/encode.go b/encode.go
index d816a7d..567a3c5 100644
--- a/encode.go
+++ b/encode.go
@@ -246,9 +246,8 @@
// Invariant: we have a 4-byte match at s, and no need to emit any
// literal bytes prior to s.
base := s
- s += 4
- for i := candidate + 4; s < len(src) && src[i] == src[s]; i, s = i+1, s+1 {
- }
+ // Extend the 4-byte match as long as possible.
+ s = extendMatch(src, candidate+4, s+4)
d += emitCopy(dst[d:], base-candidate, s-base)
nextEmit = s
if s >= sLimit {
diff --git a/encode_amd64.go b/encode_amd64.go
new file mode 100644
index 0000000..d71383e
--- /dev/null
+++ b/encode_amd64.go
@@ -0,0 +1,14 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+package snappy
+
+// extendMatch has the same semantics as in encode_other.go.
+//
+//go:noescape
+func extendMatch(src []byte, i, j int) int
diff --git a/encode_amd64.s b/encode_amd64.s
new file mode 100644
index 0000000..b33d9e2
--- /dev/null
+++ b/encode_amd64.s
@@ -0,0 +1,77 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The asm code generally follows the pure Go code in encode_other.go, except
+// where marked with a "!!!".
+
+// func extendMatch(src []byte, i, j int) int
+//
+// All local variables fit into registers. The register allocation:
+// - CX &src[0]
+// - DX &src[len(src)]
+// - SI &src[i]
+// - DI &src[j]
+// - R9 &src[len(src) - 8]
+TEXT ·extendMatch(SB), NOSPLIT, $0-48
+ MOVQ src_base+0(FP), CX
+ MOVQ src_len+8(FP), DX
+ MOVQ i+24(FP), SI
+ MOVQ j+32(FP), DI
+ ADDQ CX, DX
+ ADDQ CX, SI
+ ADDQ CX, DI
+ MOVQ DX, R9
+ SUBQ $8, R9
+
+cmp8:
+ // As long as we are 8 or more bytes before the end of src, we can load and
+ // compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+ CMPQ DI, R9
+ JA cmp1
+ MOVQ (SI), AX
+ MOVQ (DI), BX
+ CMPQ AX, BX
+ JNE bsf
+ ADDQ $8, SI
+ ADDQ $8, DI
+ JMP cmp8
+
+bsf:
+ // If those 8 bytes were not equal, XOR the two 8 byte values, and return
+ // the index of the first byte that differs. The BSF instruction finds the
+ // least significant 1 bit, the amd64 architecture is little-endian, and
+ // the shift by 3 converts a bit index to a byte index.
+ XORQ AX, BX
+ BSFQ BX, BX
+ SHRQ $3, BX
+ ADDQ BX, DI
+
+ // Convert from &src[ret] to ret.
+ SUBQ CX, DI
+ MOVQ DI, ret+40(FP)
+ RET
+
+cmp1:
+ // In src's tail, compare 1 byte at a time.
+ CMPQ DI, DX
+ JAE end
+ MOVB (SI), AX
+ MOVB (DI), BX
+ CMPB AX, BX
+ JNE end
+ ADDQ $1, SI
+ ADDQ $1, DI
+ JMP cmp1
+
+end:
+ // Convert from &src[ret] to ret.
+ SUBQ CX, DI
+ MOVQ DI, ret+40(FP)
+ RET
diff --git a/encode_other.go b/encode_other.go
new file mode 100644
index 0000000..43d4d9a
--- /dev/null
+++ b/encode_other.go
@@ -0,0 +1,18 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64 appengine !gc noasm
+
+package snappy
+
+// extendMatch returns the largest k such that k <= len(src) and that
+// src[i:i+k-j] and src[j:k] have the same contents.
+//
+// It assumes that:
+// 0 <= i && i < j && j <= len(src)
+func extendMatch(src []byte, i, j int) int {
+ for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+ }
+ return j
+}
diff --git a/golden_test.go b/golden_test.go
new file mode 100644
index 0000000..e4496f9
--- /dev/null
+++ b/golden_test.go
@@ -0,0 +1,1965 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snappy
+
+// extendMatchGoldenTestCases is the i and j arguments, and the returned value,
+// for every extendMatch call issued when encoding the
+// testdata/Mark.Twain-Tom.Sawyer.txt file. It is used to benchmark the
+// extendMatch implementation.
+//
+// It was generated manually by adding some print statements to the (pure Go)
+// extendMatch implementation:
+//
+// func extendMatch(src []byte, i, j int) int {
+// i0, j0 := i, j
+// for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+// }
+// println("{", i0, ",", j0, ",", j, "},")
+// return j
+// }
+//
+// and running "go test -test.run=EncodeGoldenInput -tags=noasm".
+var extendMatchGoldenTestCases = []struct {
+ i, j, want int
+}{
+ {11, 61, 62},
+ {80, 81, 82},
+ {86, 87, 101},
+ {85, 133, 149},
+ {152, 153, 162},
+ {133, 168, 193},
+ {168, 207, 225},
+ {81, 255, 275},
+ {278, 279, 283},
+ {306, 417, 417},
+ {373, 428, 430},
+ {389, 444, 447},
+ {474, 510, 512},
+ {465, 533, 533},
+ {47, 547, 547},
+ {307, 551, 554},
+ {420, 582, 587},
+ {309, 604, 604},
+ {604, 625, 625},
+ {538, 629, 629},
+ {328, 640, 640},
+ {573, 645, 645},
+ {319, 657, 657},
+ {30, 664, 664},
+ {45, 679, 680},
+ {621, 684, 684},
+ {376, 700, 700},
+ {33, 707, 708},
+ {601, 733, 733},
+ {334, 744, 745},
+ {625, 758, 759},
+ {382, 763, 763},
+ {550, 769, 771},
+ {533, 789, 789},
+ {804, 813, 813},
+ {342, 841, 842},
+ {742, 847, 847},
+ {74, 852, 852},
+ {810, 864, 864},
+ {758, 868, 869},
+ {714, 883, 883},
+ {582, 889, 891},
+ {61, 934, 935},
+ {894, 942, 942},
+ {939, 949, 949},
+ {785, 956, 957},
+ {886, 978, 978},
+ {792, 998, 998},
+ {998, 1005, 1005},
+ {572, 1032, 1032},
+ {698, 1051, 1053},
+ {599, 1067, 1069},
+ {1056, 1079, 1079},
+ {942, 1089, 1090},
+ {831, 1094, 1096},
+ {1088, 1100, 1103},
+ {732, 1113, 1114},
+ {1037, 1118, 1118},
+ {872, 1128, 1130},
+ {1079, 1140, 1142},
+ {332, 1162, 1162},
+ {207, 1168, 1186},
+ {1189, 1190, 1225},
+ {105, 1229, 1230},
+ {79, 1256, 1257},
+ {1190, 1261, 1283},
+ {255, 1306, 1306},
+ {1319, 1339, 1358},
+ {364, 1370, 1370},
+ {955, 1378, 1380},
+ {122, 1403, 1403},
+ {1325, 1407, 1419},
+ {664, 1423, 1424},
+ {941, 1461, 1463},
+ {867, 1477, 1478},
+ {757, 1488, 1489},
+ {1140, 1499, 1499},
+ {31, 1506, 1506},
+ {1487, 1510, 1512},
+ {1089, 1520, 1521},
+ {1467, 1525, 1529},
+ {1394, 1537, 1537},
+ {1499, 1541, 1541},
+ {367, 1558, 1558},
+ {1475, 1564, 1564},
+ {1525, 1568, 1571},
+ {1541, 1582, 1583},
+ {864, 1587, 1588},
+ {704, 1597, 1597},
+ {336, 1602, 1602},
+ {1383, 1613, 1613},
+ {1498, 1617, 1618},
+ {1051, 1623, 1625},
+ {401, 1643, 1645},
+ {1072, 1654, 1655},
+ {1067, 1667, 1669},
+ {699, 1673, 1674},
+ {1587, 1683, 1684},
+ {920, 1696, 1696},
+ {1505, 1710, 1710},
+ {1550, 1723, 1723},
+ {996, 1727, 1727},
+ {833, 1733, 1734},
+ {1638, 1739, 1740},
+ {1654, 1744, 1744},
+ {753, 1761, 1761},
+ {1548, 1773, 1773},
+ {1568, 1777, 1780},
+ {1683, 1793, 1794},
+ {948, 1801, 1801},
+ {1666, 1805, 1808},
+ {1502, 1814, 1814},
+ {1696, 1822, 1822},
+ {502, 1836, 1837},
+ {917, 1843, 1843},
+ {1733, 1854, 1855},
+ {970, 1859, 1859},
+ {310, 1863, 1863},
+ {657, 1872, 1872},
+ {1005, 1876, 1876},
+ {1662, 1880, 1880},
+ {904, 1892, 1892},
+ {1427, 1910, 1910},
+ {1772, 1929, 1930},
+ {1822, 1937, 1940},
+ {1858, 1949, 1950},
+ {1602, 1956, 1956},
+ {1150, 1962, 1962},
+ {1504, 1966, 1967},
+ {51, 1971, 1971},
+ {1605, 1979, 1979},
+ {1458, 1983, 1988},
+ {1536, 2001, 2006},
+ {1373, 2014, 2018},
+ {1494, 2025, 2025},
+ {1667, 2029, 2031},
+ {1592, 2035, 2035},
+ {330, 2045, 2045},
+ {1376, 2053, 2053},
+ {1991, 2058, 2059},
+ {1635, 2065, 2065},
+ {1992, 2073, 2074},
+ {2014, 2080, 2081},
+ {1546, 2085, 2087},
+ {59, 2099, 2099},
+ {1996, 2106, 2106},
+ {1836, 2110, 2110},
+ {2068, 2114, 2114},
+ {1338, 2122, 2122},
+ {1562, 2128, 2130},
+ {1934, 2134, 2134},
+ {2114, 2141, 2142},
+ {977, 2149, 2150},
+ {956, 2154, 2155},
+ {1407, 2162, 2162},
+ {1773, 2166, 2166},
+ {883, 2171, 2171},
+ {623, 2175, 2178},
+ {1520, 2191, 2192},
+ {1162, 2200, 2200},
+ {912, 2204, 2204},
+ {733, 2208, 2208},
+ {1777, 2212, 2215},
+ {1532, 2219, 2219},
+ {718, 2223, 2225},
+ {2069, 2229, 2229},
+ {2207, 2245, 2246},
+ {1139, 2264, 2264},
+ {677, 2274, 2274},
+ {2099, 2279, 2279},
+ {1863, 2283, 2283},
+ {1966, 2305, 2306},
+ {2279, 2313, 2313},
+ {1628, 2319, 2319},
+ {755, 2329, 2329},
+ {1461, 2334, 2334},
+ {2117, 2340, 2340},
+ {2313, 2349, 2349},
+ {1859, 2353, 2353},
+ {1048, 2362, 2362},
+ {895, 2366, 2366},
+ {2278, 2373, 2373},
+ {1884, 2377, 2377},
+ {1402, 2387, 2392},
+ {700, 2398, 2398},
+ {1971, 2402, 2402},
+ {2009, 2419, 2419},
+ {1441, 2426, 2428},
+ {2208, 2432, 2432},
+ {2038, 2436, 2436},
+ {932, 2443, 2443},
+ {1759, 2447, 2448},
+ {744, 2452, 2452},
+ {1875, 2458, 2458},
+ {2405, 2468, 2468},
+ {1596, 2472, 2473},
+ {1953, 2480, 2482},
+ {736, 2487, 2487},
+ {1913, 2493, 2493},
+ {774, 2497, 2497},
+ {1484, 2506, 2508},
+ {2432, 2512, 2512},
+ {752, 2519, 2519},
+ {2497, 2523, 2523},
+ {2409, 2528, 2529},
+ {2122, 2533, 2533},
+ {2396, 2537, 2538},
+ {2410, 2547, 2548},
+ {1093, 2555, 2560},
+ {551, 2564, 2565},
+ {2268, 2569, 2569},
+ {1362, 2580, 2580},
+ {1916, 2584, 2585},
+ {994, 2589, 2590},
+ {1979, 2596, 2596},
+ {1041, 2602, 2602},
+ {2104, 2614, 2616},
+ {2609, 2621, 2628},
+ {2329, 2638, 2638},
+ {2211, 2657, 2658},
+ {2638, 2662, 2667},
+ {2578, 2676, 2679},
+ {2153, 2685, 2686},
+ {2608, 2696, 2697},
+ {598, 2712, 2712},
+ {2620, 2719, 2720},
+ {1888, 2724, 2728},
+ {2709, 2732, 2732},
+ {1365, 2739, 2739},
+ {784, 2747, 2748},
+ {424, 2753, 2753},
+ {2204, 2759, 2759},
+ {812, 2768, 2769},
+ {2455, 2773, 2773},
+ {1722, 2781, 2781},
+ {1917, 2792, 2792},
+ {2705, 2799, 2799},
+ {2685, 2806, 2807},
+ {2742, 2811, 2811},
+ {1370, 2818, 2818},
+ {2641, 2830, 2830},
+ {2512, 2837, 2837},
+ {2457, 2841, 2841},
+ {2756, 2845, 2845},
+ {2719, 2855, 2855},
+ {1423, 2859, 2859},
+ {2849, 2863, 2865},
+ {1474, 2871, 2871},
+ {1161, 2875, 2876},
+ {2282, 2880, 2881},
+ {2746, 2888, 2888},
+ {1783, 2893, 2893},
+ {2401, 2899, 2900},
+ {2632, 2920, 2923},
+ {2422, 2928, 2930},
+ {2715, 2939, 2939},
+ {2162, 2943, 2943},
+ {2859, 2947, 2947},
+ {1910, 2951, 2951},
+ {1431, 2955, 2956},
+ {1439, 2964, 2964},
+ {2501, 2968, 2969},
+ {2029, 2973, 2976},
+ {689, 2983, 2984},
+ {1658, 2988, 2988},
+ {1031, 2996, 2996},
+ {2149, 3001, 3002},
+ {25, 3009, 3013},
+ {2964, 3023, 3023},
+ {953, 3027, 3028},
+ {2359, 3036, 3036},
+ {3023, 3049, 3049},
+ {2880, 3055, 3056},
+ {2973, 3076, 3077},
+ {2874, 3090, 3090},
+ {2871, 3094, 3094},
+ {2532, 3100, 3100},
+ {2938, 3107, 3108},
+ {350, 3115, 3115},
+ {2196, 3119, 3121},
+ {1133, 3127, 3129},
+ {1797, 3134, 3150},
+ {3032, 3158, 3158},
+ {3016, 3172, 3172},
+ {2533, 3179, 3179},
+ {3055, 3187, 3188},
+ {1384, 3192, 3193},
+ {2799, 3199, 3199},
+ {2126, 3203, 3207},
+ {2334, 3215, 3215},
+ {2105, 3220, 3221},
+ {3199, 3229, 3229},
+ {2891, 3233, 3233},
+ {855, 3240, 3240},
+ {1852, 3253, 3256},
+ {2140, 3263, 3263},
+ {1682, 3268, 3270},
+ {3243, 3274, 3274},
+ {924, 3279, 3279},
+ {2212, 3283, 3283},
+ {2596, 3287, 3287},
+ {2999, 3291, 3291},
+ {2353, 3295, 3295},
+ {2480, 3302, 3304},
+ {1959, 3308, 3311},
+ {3000, 3318, 3318},
+ {845, 3330, 3330},
+ {2283, 3334, 3334},
+ {2519, 3342, 3342},
+ {3325, 3346, 3348},
+ {2397, 3353, 3354},
+ {2763, 3358, 3358},
+ {3198, 3363, 3364},
+ {3211, 3368, 3372},
+ {2950, 3376, 3377},
+ {3245, 3388, 3391},
+ {2264, 3398, 3398},
+ {795, 3403, 3403},
+ {3287, 3407, 3407},
+ {3358, 3411, 3411},
+ {3317, 3415, 3415},
+ {3232, 3431, 3431},
+ {2128, 3435, 3437},
+ {3236, 3441, 3441},
+ {3398, 3445, 3446},
+ {2814, 3450, 3450},
+ {3394, 3466, 3466},
+ {2425, 3470, 3470},
+ {3330, 3476, 3476},
+ {1612, 3480, 3480},
+ {1004, 3485, 3486},
+ {2732, 3490, 3490},
+ {1117, 3494, 3495},
+ {629, 3501, 3501},
+ {3087, 3514, 3514},
+ {684, 3518, 3518},
+ {3489, 3522, 3524},
+ {1760, 3529, 3529},
+ {617, 3537, 3537},
+ {3431, 3541, 3541},
+ {997, 3547, 3547},
+ {882, 3552, 3553},
+ {2419, 3558, 3558},
+ {610, 3562, 3563},
+ {1903, 3567, 3569},
+ {3005, 3575, 3575},
+ {3076, 3585, 3586},
+ {3541, 3590, 3590},
+ {3490, 3594, 3594},
+ {1899, 3599, 3599},
+ {3545, 3606, 3606},
+ {3290, 3614, 3615},
+ {2056, 3619, 3620},
+ {3556, 3625, 3625},
+ {3294, 3632, 3633},
+ {637, 3643, 3644},
+ {3609, 3648, 3650},
+ {3175, 3658, 3658},
+ {3498, 3665, 3665},
+ {1597, 3669, 3669},
+ {1983, 3673, 3673},
+ {3215, 3682, 3682},
+ {3544, 3689, 3689},
+ {3694, 3698, 3698},
+ {3228, 3715, 3716},
+ {2594, 3720, 3722},
+ {3573, 3726, 3726},
+ {2479, 3732, 3735},
+ {3191, 3741, 3742},
+ {1113, 3746, 3747},
+ {2844, 3751, 3751},
+ {3445, 3756, 3757},
+ {3755, 3766, 3766},
+ {3421, 3775, 3780},
+ {3593, 3784, 3786},
+ {3263, 3796, 3796},
+ {3469, 3806, 3806},
+ {2602, 3815, 3815},
+ {723, 3819, 3821},
+ {1608, 3826, 3826},
+ {3334, 3830, 3830},
+ {2198, 3835, 3835},
+ {2635, 3840, 3840},
+ {3702, 3852, 3853},
+ {3406, 3858, 3859},
+ {3681, 3867, 3870},
+ {3407, 3880, 3880},
+ {340, 3889, 3889},
+ {3772, 3893, 3893},
+ {593, 3897, 3897},
+ {2563, 3914, 3916},
+ {2981, 3929, 3929},
+ {1835, 3933, 3934},
+ {3906, 3951, 3951},
+ {1459, 3958, 3958},
+ {3889, 3974, 3974},
+ {2188, 3982, 3982},
+ {3220, 3986, 3987},
+ {3585, 3991, 3993},
+ {3712, 3997, 4001},
+ {2805, 4007, 4007},
+ {1879, 4012, 4013},
+ {3618, 4018, 4018},
+ {1145, 4031, 4032},
+ {3901, 4037, 4037},
+ {2772, 4046, 4047},
+ {2802, 4053, 4054},
+ {3299, 4058, 4058},
+ {3725, 4066, 4066},
+ {2271, 4070, 4070},
+ {385, 4075, 4076},
+ {3624, 4089, 4090},
+ {3745, 4096, 4098},
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+ {11040, 12618, 12625},
+ {12479, 12629, 12629},
+ {6903, 12633, 12633},
+ {12322, 12639, 12639},
+ {12253, 12643, 12645},
+ {5594, 12651, 12651},
+ {12522, 12655, 12655},
+ {11703, 12659, 12659},
+ {1377, 12665, 12665},
+ {8022, 12669, 12669},
+ {12280, 12674, 12674},
+ {9023, 12680, 12681},
+ {12328, 12685, 12685},
+ {3085, 12689, 12693},
+ {4700, 12698, 12698},
+ {10224, 12702, 12702},
+ {8781, 12706, 12706},
+ {1651, 12710, 12710},
+ {12458, 12714, 12714},
+ {12005, 12718, 12721},
+ {11908, 12725, 12726},
+ {8202, 12733, 12733},
+ {11708, 12739, 12740},
+ {12599, 12744, 12745},
+ {12284, 12749, 12749},
+ {5285, 12756, 12756},
+ {12055, 12775, 12777},
+ {6919, 12782, 12782},
+ {12242, 12786, 12786},
+ {12009, 12790, 12790},
+ {9628, 12794, 12796},
+ {11354, 12801, 12802},
+ {10225, 12806, 12807},
+ {579, 12813, 12813},
+ {8935, 12817, 12822},
+ {8753, 12827, 12829},
+ {11006, 12835, 12835},
+ {858, 12841, 12845},
+ {476, 12849, 12849},
+ {7667, 12854, 12854},
+ {12760, 12860, 12871},
+ {11677, 12875, 12877},
+ {12714, 12881, 12881},
+ {12731, 12885, 12890},
+ {7108, 12894, 12896},
+ {1165, 12900, 12900},
+ {4021, 12906, 12906},
+ {10829, 12910, 12911},
+ {12331, 12915, 12915},
+ {8887, 12919, 12921},
+ {11639, 12925, 12925},
+ {7964, 12929, 12929},
+ {12528, 12937, 12937},
+ {8148, 12941, 12941},
+ {12770, 12948, 12950},
+ {12609, 12954, 12954},
+ {12685, 12958, 12958},
+ {2803, 12962, 12962},
+ {9561, 12966, 12966},
+ {6671, 12972, 12973},
+ {12056, 12977, 12977},
+ {6380, 12981, 12981},
+ {12048, 12985, 12985},
+ {11961, 12989, 12993},
+ {3368, 12997, 12999},
+ {6634, 13004, 13004},
+ {6775, 13009, 13010},
+ {12136, 13014, 13019},
+ {10341, 13023, 13023},
+ {13002, 13027, 13027},
+ {10587, 13031, 13031},
+ {10307, 13035, 13035},
+ {12736, 13039, 13039},
+ {12744, 13043, 13044},
+ {6175, 13048, 13048},
+ {9702, 13053, 13054},
+ {662, 13059, 13061},
+ {12718, 13065, 13068},
+ {12893, 13072, 13075},
+ {8299, 13086, 13091},
+ {12604, 13095, 13096},
+ {12848, 13100, 13101},
+ {12749, 13105, 13105},
+ {12526, 13109, 13114},
+ {9173, 13122, 13122},
+ {12769, 13128, 13128},
+ {13038, 13132, 13132},
+ {12725, 13136, 13137},
+ {12639, 13146, 13146},
+ {9711, 13150, 13151},
+ {12137, 13155, 13155},
+ {13039, 13159, 13159},
+ {4681, 13163, 13164},
+ {12954, 13168, 13168},
+ {13158, 13175, 13176},
+ {13105, 13180, 13180},
+ {10754, 13184, 13184},
+ {13167, 13188, 13188},
+ {12658, 13192, 13192},
+ {4294, 13199, 13200},
+ {11682, 13204, 13205},
+ {11695, 13209, 13209},
+ {11076, 13214, 13214},
+ {12232, 13218, 13218},
+ {9399, 13223, 13224},
+ {12880, 13228, 13229},
+ {13048, 13234, 13234},
+ {9701, 13238, 13239},
+ {13209, 13243, 13243},
+ {3658, 13248, 13248},
+ {3698, 13252, 13254},
+ {12237, 13260, 13260},
+ {8872, 13266, 13266},
+ {12957, 13272, 13273},
+ {1393, 13281, 13281},
+ {2013, 13285, 13288},
+ {4244, 13296, 13299},
+ {9428, 13303, 13303},
+ {12702, 13307, 13307},
+ {13078, 13311, 13311},
+ {6071, 13315, 13315},
+ {3061, 13319, 13319},
+ {2051, 13324, 13324},
+ {11560, 13328, 13331},
+ {6584, 13336, 13336},
+ {8482, 13340, 13340},
+ {5331, 13344, 13344},
+ {4171, 13348, 13348},
+ {8501, 13352, 13352},
+ {9219, 13356, 13356},
+ {9473, 13360, 13363},
+ {12881, 13367, 13367},
+ {13065, 13371, 13375},
+ {2979, 13379, 13384},
+ {1518, 13388, 13388},
+ {11177, 13392, 13392},
+ {9457, 13398, 13398},
+ {12293, 13407, 13410},
+ {3697, 13414, 13417},
+ {10338, 13425, 13425},
+ {13367, 13429, 13429},
+ {11074, 13433, 13437},
+ {4201, 13441, 13443},
+ {1812, 13447, 13448},
+ {13360, 13452, 13456},
+ {13188, 13463, 13463},
+ {9732, 13470, 13470},
+ {11332, 13477, 13477},
+ {9918, 13487, 13487},
+ {6337, 13497, 13497},
+ {13429, 13501, 13501},
+ {11413, 13505, 13505},
+ {4685, 13512, 13513},
+ {13136, 13517, 13519},
+ {7416, 13528, 13530},
+ {12929, 13534, 13534},
+ {11110, 13539, 13539},
+ {11521, 13543, 13543},
+ {12825, 13553, 13553},
+ {13447, 13557, 13558},
+ {12299, 13562, 13563},
+ {9003, 13570, 13570},
+ {12500, 13577, 13577},
+ {13501, 13581, 13581},
+ {9392, 13586, 13586},
+ {12454, 13590, 13590},
+ {6189, 13595, 13595},
+ {13053, 13599, 13599},
+ {11881, 13604, 13604},
+ {13159, 13608, 13608},
+ {4894, 13612, 13612},
+ {13221, 13621, 13621},
+ {8950, 13625, 13625},
+ {13533, 13629, 13629},
+ {9633, 13633, 13633},
+ {7892, 13637, 13639},
+ {13581, 13643, 13643},
+ {13616, 13647, 13649},
+ {12794, 13653, 13654},
+ {8919, 13659, 13659},
+ {9674, 13663, 13663},
+ {13577, 13668, 13668},
+ {12966, 13672, 13672},
+ {12659, 13676, 13683},
+ {6124, 13688, 13688},
+ {9225, 13693, 13695},
+ {11833, 13702, 13702},
+ {12904, 13709, 13717},
+ {13647, 13721, 13722},
+ {11687, 13726, 13727},
+ {12434, 13731, 13732},
+ {12689, 13736, 13742},
+ {13168, 13746, 13746},
+ {6151, 13751, 13752},
+ {11821, 13756, 13757},
+ {6467, 13764, 13764},
+ {5730, 13769, 13769},
+ {5136, 13780, 13780},
+ {724, 13784, 13785},
+ {13517, 13789, 13791},
+ {640, 13795, 13796},
+ {7721, 13800, 13802},
+ {11121, 13806, 13807},
+ {5791, 13811, 13815},
+ {12894, 13819, 13819},
+ {11100, 13824, 13824},
+ {7011, 13830, 13830},
+ {7129, 13834, 13837},
+ {13833, 13841, 13841},
+ {11276, 13847, 13847},
+ {13621, 13853, 13853},
+ {13589, 13862, 13863},
+ {12989, 13867, 13867},
+ {12789, 13871, 13871},
+ {1239, 13875, 13875},
+ {4675, 13879, 13881},
+ {4686, 13885, 13885},
+ {707, 13889, 13889},
+ {5449, 13897, 13898},
+ {13867, 13902, 13903},
+ {10613, 13908, 13908},
+ {13789, 13912, 13914},
+ {4451, 13918, 13919},
+ {9200, 13924, 13924},
+ {2011, 13930, 13930},
+ {11433, 13934, 13936},
+ {4695, 13942, 13943},
+ {9435, 13948, 13951},
+ {13688, 13955, 13957},
+ {11694, 13961, 13962},
+ {5712, 13966, 13966},
+ {5991, 13970, 13972},
+ {13477, 13976, 13976},
+ {10213, 13987, 13987},
+ {11839, 13991, 13993},
+ {12272, 13997, 13997},
+ {6206, 14001, 14001},
+ {13179, 14006, 14007},
+ {2939, 14011, 14011},
+ {12972, 14016, 14017},
+ {13918, 14021, 14022},
+ {7436, 14026, 14027},
+ {7678, 14032, 14034},
+ {13586, 14040, 14040},
+ {13347, 14044, 14044},
+ {13109, 14048, 14051},
+ {9244, 14055, 14057},
+ {13315, 14061, 14061},
+ {13276, 14067, 14067},
+ {11435, 14073, 14074},
+ {13853, 14078, 14078},
+ {13452, 14082, 14082},
+ {14044, 14087, 14087},
+ {4440, 14091, 14095},
+ {4479, 14100, 14103},
+ {9395, 14107, 14109},
+ {6834, 14119, 14119},
+ {10458, 14123, 14124},
+ {1429, 14129, 14129},
+ {8443, 14135, 14135},
+ {10365, 14140, 14140},
+ {5267, 14145, 14145},
+ {11834, 14151, 14153},
+}
diff --git a/snappy_test.go b/snappy_test.go
index df111f5..4dbb527 100644
--- a/snappy_test.go
+++ b/snappy_test.go
@@ -497,6 +497,49 @@
}
}
+func TestExtendMatchGoldenInput(t *testing.T) {
+ src, err := ioutil.ReadFile(goldenText)
+ if err != nil {
+ t.Fatalf("ReadFile: %v", err)
+ }
+ for i, tc := range extendMatchGoldenTestCases {
+ got := extendMatch(src, tc.i, tc.j)
+ if got != tc.want {
+ t.Errorf("test #%d: i, j = %5d, %5d: got %5d (= j + %6d), want %5d (= j + %6d)",
+ i, tc.i, tc.j, got, got-tc.j, tc.want, tc.want-tc.j)
+ }
+ }
+}
+
+func TestExtendMatch(t *testing.T) {
+ // ref is a simple, reference implementation of extendMatch.
+ ref := func(src []byte, i, j int) int {
+ for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+ }
+ return j
+ }
+
+ nums := []int{0, 1, 2, 7, 8, 9, 29, 30, 31, 32, 33, 34, 38, 39, 40}
+ for yIndex := 40; yIndex > 30; yIndex-- {
+ xxx := bytes.Repeat([]byte("x"), 40)
+ if yIndex < len(xxx) {
+ xxx[yIndex] = 'y'
+ }
+ for _, i := range nums {
+ for _, j := range nums {
+ if i >= j {
+ continue
+ }
+ got := extendMatch(xxx, i, j)
+ want := ref(xxx, i, j)
+ if got != want {
+ t.Errorf("yIndex=%d, i=%d, j=%d: got %d, want %d", yIndex, i, j, got, want)
+ }
+ }
+ }
+ }
+}
+
const snappytoolCmdName = "cmd/snappytool/snappytool"
func skipTestSameEncodingAsCpp() (msg string) {
@@ -1254,3 +1297,16 @@
func Benchmark_ZFlat9(b *testing.B) { benchFile(b, 9, false) }
func Benchmark_ZFlat10(b *testing.B) { benchFile(b, 10, false) }
func Benchmark_ZFlat11(b *testing.B) { benchFile(b, 11, false) }
+
+func BenchmarkExtendMatch(b *testing.B) {
+ src, err := ioutil.ReadFile(goldenText)
+ if err != nil {
+ b.Fatalf("ReadFile: %v", err)
+ }
+ b.ResetTimer()
+ for i := 0; i < b.N; i++ {
+ for _, tc := range extendMatchGoldenTestCases {
+ extendMatch(src, tc.i, tc.j)
+ }
+ }
+}
