void CRC32_Update_ARMV8(const byte *s, size_t n, word32& c) { for(; !IsAligned<word32>(s) && n > 0; s++, n--) c = __crc32b(c, *s); for(; n > 4; s+=4, n-=4) c = __crc32w(c, *(const word32 *)(void*)s); for(; n > 0; s++, n--) c = __crc32b(c, *s); }
void CRC32::Update(const byte *s, size_t n) { #if (CRYPTOPP_BOOL_ARM_CRC32_INTRINSICS_AVAILABLE) if (HasCRC32()) { for(; !IsAligned<word32>(s) && n > 0; s++, n--) m_crc = __crc32b(m_crc, *s); for(; n > 4; s+=4, n-=4) m_crc = __crc32w(m_crc, *(const word32 *)(void*)s); for(; n > 0; s++, n--) m_crc = __crc32b(m_crc, *s); return; } #endif word32 crc = m_crc; for(; !IsAligned<word32>(s) && n > 0; n--) crc = m_tab[CRC32_INDEX(crc) ^ *s++] ^ CRC32_SHIFTED(crc); while (n >= 4) { crc ^= *(const word32 *)(void*)s; crc = m_tab[CRC32_INDEX(crc)] ^ CRC32_SHIFTED(crc); crc = m_tab[CRC32_INDEX(crc)] ^ CRC32_SHIFTED(crc); crc = m_tab[CRC32_INDEX(crc)] ^ CRC32_SHIFTED(crc); crc = m_tab[CRC32_INDEX(crc)] ^ CRC32_SHIFTED(crc); n -= 4; s += 4; } while (n--) crc = m_tab[CRC32_INDEX(crc) ^ *s++] ^ CRC32_SHIFTED(crc); m_crc = crc; }
uint32_t test_crc32w (uint32_t arg0, uint32_t arg1) { return __crc32w (arg0, arg1); }
bool CPU_ProbeCRC32() { #if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES) return false; #elif (CRYPTOPP_ARM_CRC32_AVAILABLE) # if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY) volatile bool result = true; __try { word32 w=0, x=1; word16 y=2; byte z=3; w = __crc32w(w,x); w = __crc32h(w,y); w = __crc32b(w,z); w = __crc32cw(w,x); w = __crc32ch(w,y); w = __crc32cb(w,z); result = !!w; } __except (EXCEPTION_EXECUTE_HANDLER) { return false; } return result; #else // longjmp and clobber warnings. Volatile is required. // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854 volatile bool result = true; volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler); if (oldHandler == SIG_ERR) return false; volatile sigset_t oldMask; if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask)) return false; if (setjmp(s_jmpSIGILL)) result = false; else { word32 w=0, x=1; word16 y=2; byte z=3; w = __crc32w(w,x); w = __crc32h(w,y); w = __crc32b(w,z); w = __crc32cw(w,x); w = __crc32ch(w,y); w = __crc32cb(w,z); // Hack... GCC optimizes away the code and returns true result = !!w; } sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR); signal(SIGILL, oldHandler); return result; # endif #else return false; #endif // CRYPTOPP_ARM_CRC32_AVAILABLE }
// ARM-LABEL: test_crc32w // AArch32: call i32 @llvm.arm.crc32w // AArch64: call i32 @llvm.aarch64.crc32w uint32_t test_crc32w(uint32_t a, uint32_t b) { return __crc32w(a, b); }