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/* insert_string_acle.c -- insert_string variant using ACLE's CRC instructions
*
* Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*
*/
#ifdef ARM_ACLE_CRC_HASH
#ifndef _MSC_VER
# include <arm_acle.h>
#endif
#include "../../zbuild.h"
#include "../../deflate.h"
#if defined(__clang__)
/* CRC32 intrinsics are #ifdef'ed out of arm_acle.h unless we build with an
* armv8 target, which is incompatible with ThinLTO optimizations on Android.
* (Namely, mixing and matching different module-level targets makes ThinLTO
* warn, and Android defaults to armv7-a. This restriction does not apply to
* function-level `target`s, however.)
*
* Since we only need four crc intrinsics, and since clang's implementation of
* those are just wrappers around compiler builtins, it's simplest to #define
* those builtins directly. If this #define list grows too much (or we depend on
* an intrinsic that isn't a trivial wrapper), we may have to find a better way
* to go about this.
*
* NOTE: clang currently complains that "'+soft-float-abi' is not a recognized
* feature for this target (ignoring feature)." This appears to be a harmless
* bug in clang.
*/
#define __crc32b __builtin_arm_crc32b
#define __crc32d __builtin_arm_crc32d
#define __crc32w __builtin_arm_crc32w
#define __crc32cw __builtin_arm_crc32cw
#if defined(__aarch64__)
#define TARGET_ARMV8_WITH_CRC __attribute__((target("crc")))
#else // !defined(__aarch64__)
#define TARGET_ARMV8_WITH_CRC __attribute__((target("armv8-a,crc")))
#endif // defined(__aarch64__)
#elif defined(__GNUC__)
/* For GCC, we are setting CRC extensions at module level, so ThinLTO is not
* allowed. We can just include arm_acle.h.
*/
#include <arm_acle.h>
#define TARGET_ARMV8_WITH_CRC
#else // !defined(__GNUC__) && !defined(_aarch64__)
#error ARM CRC32 SIMD extensions only supported for Clang and GCC
#endif
#define UPDATE_HASH(s, h, val) \
h = __crc32w(0, val)
#define INSERT_STRING TARGET_ARMV8_WITH_CRC insert_string_acle
#define QUICK_INSERT_STRING TARGET_ARMV8_WITH_CRC quick_insert_string_acle
#include "../../insert_string_tpl.h"
#endif
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