kc3-lang/brotli

2018-09-27T12:15:46

decode: faster huffman code loading on 32-bit Arm (#703) * platform: add macro for using the 'aligned' attribute * decode: add accessor macros for HuffmanCode fields Adds a constructor function for building HuffmanCode values so they can be accessed quickly on different architectures. Also adds macros for marking a HuffmanCode table pointer that can be accessed quickly (BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD), adjusting the index into that table (BROTLI_HC_ADJUST_TABLE_INDEX), and getting the .bits or .value fields out of the table at the current index (BROTLI_HC_GET_BITS/VALUE). For example, assuming |table| contains a HuffmanCode pointer: BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); BROTLI_HC_ADJUST_TABLE_INDEX(table, index_into_table); *bits = BROTLI_HC_GET_BITS(table); *value = BROTLI_HC_GET_VALUE(table); BROTLI_HC_ADJUST_TABLE_INDEX(table, offset); *bits2 = BROTLI_HC_GET_BITS(table); *value2 = BROTLI_HC_GET_VALUE(table); All uses of the HuffmanCode have been updated appropriately. * decode: add alternative accessors for HuffmanCode on Arm AArch32