/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright ( C ) 2017 Josh Poimboeuf < jpoimboe @ redhat . com > #ifndef _ORC_LOOKUP_H#define _ORC_LOOKUP_H/* * This is a lookup table for speeding up access to the . orc_unwind table . * Given an input address offset , the corresponding lookup table entry * specifies a subset of the . orc_unwind table to search . * * Each block represents the end of the previous range and the start of the * next range . An extra block is added to give the last range an end . * * The block size should be a power of 2 to avoid a costly ' div ' instruction . * * A block size of 256 was chosen because it roughly doubles unwinder * performance while only adding ~ 5 % to the ORC data footprint . #define LOOKUP_BLOCK_ORDER 8 #define LOOKUP_BLOCK_SIZE (1 << LOOKUP_BLOCK_ORDER)#ifndef LINKER_SCRIPTextern unsigned int orc_lookup[];extern unsigned int orc_lookup_end[];#define LOOKUP_START_IP (unsigned long )_stext#define LOOKUP_STOP_IP (unsigned long )_etext#endif /* LINKER_SCRIPT */ #endif /* _ORC_LOOKUP_H */
Messung V0.5 in Prozent C=87 H=100 G=93
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