Differential D28349 Diff 78656 src/lib/caching/kshareddatacache.cpp

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src/lib/caching/kshareddatacache.cpp

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73 73​
74 if (align && len >= 4) { 74​ if (align && len >= 4) {
75 // Pre-load the temp registers 75​ // Pre-load the temp registers
76 76​
77 unsigned int t = 0, d = 0; 77​ unsigned int t = 0, d = 0;
78 78​
79 switch (align) { 79​ switch (align) {
80 case 1: t |= data[2] << 16; 80​ case 1: t |= data[2] << 16;
81​ Q_FALLTHROUGH();
81 case 2: t |= data[1] << 8; 82​ case 2: t |= data[1] << 8;
83​ Q_FALLTHROUGH();
82 case 3: t |= data[0]; 84​ case 3: t |= data[0];
83 } 85​ }
84 86​
85 t <<= (8 * align); 87​ t <<= (8 * align);
86 88​
87 data += 4 - align; 89​ data += 4 - align;
88 len -= 4 - align; 90​ len -= 4 - align;
89 91​
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107 // Handle leftover data in temp registers 109​ // Handle leftover data in temp registers
108 110​
109 int pack = len < align ? len : align; 111​ int pack = len < align ? len : align;
110 112​
111 d = 0; 113​ d = 0;
112 114​
113 switch (pack) { 115​ switch (pack) {
114 case 3: d |= data[2] << 16; 116​ case 3: d |= data[2] << 16;
117​ Q_FALLTHROUGH();
115 case 2: d |= data[1] << 8; 118​ case 2: d |= data[1] << 8;
119​ Q_FALLTHROUGH();
116 case 1: d |= data[0]; 120​ case 1: d |= data[0];
121​ Q_FALLTHROUGH();
117 case 0: h += (t >> sr) | (d << sl); 122​ case 0: h += (t >> sr) | (d << sl);
118 h *= m; 123​ h *= m;
119 h ^= h >> r; 124​ h ^= h >> r;
120 } 125​ }
121 126​
122 data += pack; 127​ data += pack;
123 len -= pack; 128​ len -= pack;
124 } else { 129​ } else {
125 while (len >= 4) { 130​ while (len >= 4) {
126 h += *reinterpret_cast<const unsigned int *>(data); 131​ h += *reinterpret_cast<const unsigned int *>(data);
127 h *= m; 132​ h *= m;
128 h ^= h >> r; 133​ h ^= h >> r;
129 134​
130 data += 4; 135​ data += 4;
131 len -= 4; 136​ len -= 4;
132 } 137​ }
133 } 138​ }
134 139​
135 //---------- 140​ //----------
136 // Handle tail bytes 141​ // Handle tail bytes
137 142​
138 switch (len) { 143​ switch (len) {
139 case 3: h += data[2] << 16; 144​ case 3: h += data[2] << 16;
145​ Q_FALLTHROUGH();
140 case 2: h += data[1] << 8; 146​ case 2: h += data[1] << 8;
147​ Q_FALLTHROUGH();
141 case 1: h += data[0]; 148​ case 1: h += data[0];
142 h *= m; 149​ h *= m;
143 h ^= h >> r; 150​ h ^= h >> r;
144 }; 151​ };
145 152​
146 h *= m; 153​ h *= m;
147 h ^= h >> 10; 154​ h ^= h >> 10;
148 h *= m; 155​ h *= m;
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