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161 lines
3.9 KiB
161 lines
3.9 KiB
// crc_simd.cpp - written and placed in the public domain by |
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// Jeffrey Walton, Uri Blumenthal and Marcel Raad. |
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// |
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// This source file uses intrinsics to gain access to SSE4.2 and |
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// ARMv8a CRC-32 and CRC-32C instructions. A separate source file |
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// is needed because additional CXXFLAGS are required to enable |
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// the appropriate instructions sets in some build configurations. |
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#include "pch.h" |
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#include "config.h" |
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#include "misc.h" |
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#if (CRYPTOPP_SSE42_AVAILABLE) |
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# include <nmmintrin.h> |
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#endif |
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#if (CRYPTOPP_ARM_NEON_HEADER) |
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# include <arm_neon.h> |
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#endif |
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#if (CRYPTOPP_ARM_ACLE_HEADER) |
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# include <stdint.h> |
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# include <arm_acle.h> |
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#endif |
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY |
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# include <signal.h> |
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# include <setjmp.h> |
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#endif |
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#ifndef EXCEPTION_EXECUTE_HANDLER |
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# define EXCEPTION_EXECUTE_HANDLER 1 |
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#endif |
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// Squash MS LNK4221 and libtool warnings |
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extern const char CRC_SIMD_FNAME[] = __FILE__; |
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NAMESPACE_BEGIN(CryptoPP) |
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#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY |
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extern "C" { |
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typedef void (*SigHandler)(int); |
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static jmp_buf s_jmpSIGILL; |
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static void SigIllHandler(int) |
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{ |
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longjmp(s_jmpSIGILL, 1); |
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} |
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} |
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#endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY |
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#if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8) |
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bool CPU_ProbeCRC32() |
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{ |
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#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) |
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return false; |
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#elif (CRYPTOPP_ARM_CRC32_AVAILABLE) |
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# if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY) |
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volatile bool result = true; |
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__try |
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{ |
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word32 w=0, x=1; word16 y=2; byte z=3; |
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w = __crc32w(w,x); |
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w = __crc32h(w,y); |
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w = __crc32b(w,z); |
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w = __crc32cw(w,x); |
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w = __crc32ch(w,y); |
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w = __crc32cb(w,z); |
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result = !!w; |
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} |
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__except (EXCEPTION_EXECUTE_HANDLER) |
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{ |
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return false; |
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} |
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return result; |
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#else |
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// longjmp and clobber warnings. Volatile is required. |
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// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854 |
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volatile bool result = true; |
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volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler); |
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if (oldHandler == SIG_ERR) |
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return false; |
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volatile sigset_t oldMask; |
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if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask)) |
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{ |
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signal(SIGILL, oldHandler); |
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return false; |
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} |
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if (setjmp(s_jmpSIGILL)) |
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result = false; |
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else |
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{ |
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word32 w=0, x=1; word16 y=2; byte z=3; |
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w = __crc32w(w,x); |
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w = __crc32h(w,y); |
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w = __crc32b(w,z); |
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w = __crc32cw(w,x); |
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w = __crc32ch(w,y); |
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w = __crc32cb(w,z); |
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// Hack... GCC optimizes away the code and returns true |
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result = !!w; |
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} |
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sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR); |
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signal(SIGILL, oldHandler); |
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return result; |
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# endif |
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#else |
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return false; |
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#endif // CRYPTOPP_ARM_CRC32_AVAILABLE |
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} |
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#endif // ARM32 or ARM64 |
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#if (CRYPTOPP_ARM_CRC32_AVAILABLE) |
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void CRC32_Update_ARMV8(const byte *s, size_t n, word32& c) |
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{ |
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for(; !IsAligned<word32>(s) && n > 0; s++, n--) |
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c = __crc32b(c, *s); |
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for(; n > 4; s+=4, n-=4) |
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c = __crc32w(c, *(const word32 *)(void*)s); |
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for(; n > 0; s++, n--) |
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c = __crc32b(c, *s); |
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} |
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void CRC32C_Update_ARMV8(const byte *s, size_t n, word32& c) |
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{ |
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for(; !IsAligned<word32>(s) && n > 0; s++, n--) |
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c = __crc32cb(c, *s); |
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for(; n > 4; s+=4, n-=4) |
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c = __crc32cw(c, *(const word32 *)(void*)s); |
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for(; n > 0; s++, n--) |
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c = __crc32cb(c, *s); |
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} |
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#endif |
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#if (CRYPTOPP_SSE42_AVAILABLE) |
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void CRC32C_Update_SSE42(const byte *s, size_t n, word32& c) |
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{ |
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for(; !IsAligned<word32>(s) && n > 0; s++, n--) |
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c = _mm_crc32_u8(c, *s); |
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for(; n > 4; s+=4, n-=4) |
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c = _mm_crc32_u32(c, *(const word32 *)(void*)s); |
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for(; n > 0; s++, n--) |
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c = _mm_crc32_u8(c, *s); |
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} |
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#endif |
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NAMESPACE_END
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