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)

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:

encode.go

@@ -246,9 +246,8 @@ func encodeBlock(dst, src []byte) (d int) {
 			// 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 {

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

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

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
+}

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},
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+	{11516, 11908, 11910},
+	{11568, 11914, 11915},
+	{10177, 11919, 11924},
+	{11363, 11928, 11929},
+	{10494, 11933, 11933},
+	{9870, 11937, 11938},
+	{9427, 11942, 11942},
+	{11481, 11949, 11949},
+	{6030, 11955, 11957},
+	{11718, 11961, 11961},
+	{10531, 11965, 11983},
+	{5126, 11987, 11987},
+	{7515, 11991, 11991},
+	{10646, 11996, 11997},
+	{2947, 12001, 12001},
+	{9582, 12009, 12010},
+	{6202, 12017, 12018},
+	{11714, 12022, 12022},
+	{9235, 12033, 12037},
+	{9721, 12041, 12044},
+	{11932, 12051, 12052},
+	{12040, 12056, 12056},
+	{12051, 12060, 12060},
+	{11601, 12066, 12066},
+	{8426, 12070, 12070},
+	{4053, 12077, 12077},
+	{4262, 12081, 12081},
+	{9761, 12086, 12088},
+	{11582, 12092, 12093},
+	{10965, 12097, 12098},
+	{11803, 12103, 12104},
+	{11933, 12108, 12109},
+	{10688, 12117, 12117},
+	{12107, 12125, 12126},
+	{6774, 12130, 12132},
+	{6286, 12137, 12137},
+	{9543, 12141, 12141},
+	{12097, 12145, 12146},
+	{10790, 12150, 12150},
+	{10125, 12154, 12156},
+	{12125, 12164, 12164},
+	{12064, 12168, 12172},
+	{10811, 12178, 12188},
+	{12092, 12192, 12193},
+	{10058, 12197, 12198},
+	{11611, 12211, 12212},
+	{3459, 12216, 12216},
+	{10291, 12225, 12228},
+	{12191, 12232, 12234},
+	{12145, 12238, 12238},
+	{12001, 12242, 12250},
+	{3840, 12255, 12255},
+	{12216, 12259, 12259},
+	{674, 12272, 12272},
+	{12141, 12276, 12276},
+	{10766, 12280, 12280},
+	{11545, 12284, 12284},
+	{6496, 12290, 12290},
+	{11381, 12294, 12295},
+	{603, 12302, 12303},
+	{12276, 12308, 12308},
+	{11850, 12313, 12314},
+	{565, 12319, 12319},
+	{9351, 12324, 12324},
+	{11822, 12328, 12328},
+	{2691, 12333, 12334},
+	{11840, 12338, 12338},
+	{11070, 12343, 12343},
+	{9510, 12347, 12347},
+	{11024, 12352, 12353},
+	{7173, 12359, 12359},
+	{517, 12363, 12363},
+	{6311, 12367, 12368},
+	{11367, 12372, 12373},
+	{12008, 12377, 12377},
+	{11372, 12382, 12384},
+	{11358, 12391, 12392},
+	{11382, 12396, 12396},
+	{6882, 12400, 12401},
+	{11246, 12405, 12405},
+	{8359, 12409, 12412},
+	{10154, 12418, 12418},
+	{12016, 12425, 12426},
+	{8972, 12434, 12435},
+	{10478, 12439, 12440},
+	{12395, 12449, 12449},
+	{11612, 12454, 12454},
+	{12347, 12458, 12458},
+	{10700, 12466, 12467},
+	{3637, 12471, 12476},
+	{1042, 12480, 12481},
+	{6747, 12488, 12488},
+	{12396, 12492, 12493},
+	{9420, 12497, 12497},
+	{11285, 12501, 12510},
+	{4470, 12515, 12515},
+	{9374, 12519, 12519},
+	{11293, 12528, 12528},
+	{2058, 12534, 12535},
+	{6521, 12539, 12539},
+	{12492, 12543, 12543},
+	{3043, 12547, 12547},
+	{2982, 12551, 12553},
+	{11030, 12557, 12563},
+	{7636, 12568, 12568},
+	{9639, 12572, 12572},
+	{12543, 12576, 12576},
+	{5989, 12580, 12583},
+	{11051, 12587, 12587},
+	{1061, 12592, 12594},
+	{12313, 12599, 12601},
+	{11846, 12605, 12605},
+	{12576, 12609, 12609},
+	{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},
+}

snappy_test.go

@@ -497,6 +497,49 @@ func TestEncodeGoldenInput(t *testing.T) {
 	}
 }
 
+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_ZFlat8(b *testing.B)  { benchFile(b, 8, false) }
 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)
+		}
+	}
+}