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Litecoin: More straightforward SSE2 detection
- Move CPU capabilities detection from init.cpp to scrypt.cpp - scrypt_1024_1_1_256_sp is defined as a macro: no need to check for SSE2 every time it is used - Test correctness of both scrypt-generic and scrypt-sse2
This commit is contained in:
Nikolay Belikov
Warren Togami
parent
4a96ed8039
commit
d781651e4c
37
src/init.cpp
37
src/init.cpp
@ -22,18 +22,6 @@
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#include <signal.h>
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#endif
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#if defined(USE_SSE2)
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#if !defined(MAC_OSX) && (defined(_M_IX86) || defined(__i386__) || defined(__i386))
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#ifdef _MSC_VER
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// MSVC 64bit is unable to use inline asm
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#include <intrin.h>
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#else
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// GCC Linux or i686-w64-mingw32
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#include <cpuid.h>
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#endif
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#endif
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#endif
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using namespace std;
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using namespace boost;
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@ -512,23 +500,6 @@ bool AppInit2(boost::thread_group& threadGroup)
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sigaction(SIGHUP, &sa_hup, NULL);
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#endif
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#if defined(USE_SSE2)
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unsigned int cpuid_edx=0;
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#if !defined(MAC_OSX) && (defined(_M_IX86) || defined(__i386__) || defined(__i386))
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// 32bit x86 Linux or Windows, detect cpuid features
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#if defined(_MSC_VER)
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// MSVC
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int x86cpuid[4];
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__cpuid(x86cpuid, 1);
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cpuid_edx = (unsigned int)buffer[3];
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#else
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// Linux or i686-w64-mingw32 (gcc-4.6.3)
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unsigned int eax, ebx, ecx;
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__get_cpuid(1, &eax, &ebx, &ecx, &cpuid_edx);
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#endif
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#endif
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#endif
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// ********************************************************* Step 2: parameter interactions
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fTestNet = GetBoolArg("-testnet");
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@ -698,6 +669,10 @@ bool AppInit2(boost::thread_group& threadGroup)
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int64 nStart;
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#if defined(USE_SSE2)
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scrypt_detect_sse2();
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#endif
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// ********************************************************* Step 5: verify wallet database integrity
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if (!fDisableWallet) {
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@ -846,10 +821,6 @@ bool AppInit2(boost::thread_group& threadGroup)
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// ********************************************************* Step 7: load block chain
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#if defined(USE_SSE2)
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scrypt_detect_sse2(cpuid_edx);
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#endif
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fReindex = GetBoolArg("-reindex");
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// Upgrading to 0.8; hard-link the old blknnnn.dat files into /blocks/
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13
src/main.cpp
13
src/main.cpp
@ -4596,20 +4596,7 @@ void static LitecoinMiner(CWallet *pwallet)
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char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
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loop
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{
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#if defined(USE_SSE2)
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// Detection would work, but in cases where we KNOW it always has SSE2,
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// it is faster to use directly than to use a function pointer or conditional.
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#if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
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// Always SSE2: x86_64 or Intel MacOS X
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scrypt_1024_1_1_256_sp_sse2(BEGIN(pblock->nVersion), BEGIN(thash), scratchpad);
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#else
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// Detect SSE2: 32bit x86 Linux or Windows
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scrypt_1024_1_1_256_sp(BEGIN(pblock->nVersion), BEGIN(thash), scratchpad);
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#endif
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#else
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// Generic scrypt
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scrypt_1024_1_1_256_sp_generic(BEGIN(pblock->nVersion), BEGIN(thash), scratchpad);
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#endif
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if (thash <= hashTarget)
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{
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@ -34,6 +34,16 @@
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#include <string.h>
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#include <openssl/sha.h>
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#if defined(USE_SSE2) && !defined(USE_SSE2_ALWAYS)
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#ifdef _MSC_VER
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// MSVC 64bit is unable to use inline asm
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#include <intrin.h>
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#else
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// GCC Linux or i686-w64-mingw32
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#include <cpuid.h>
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#endif
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#endif
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static inline uint32_t be32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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@ -277,47 +287,43 @@ void scrypt_1024_1_1_256_sp_generic(const char *input, char *output, char *scrat
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}
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#if defined(USE_SSE2)
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#if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
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/* Always SSE2 */
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void scrypt_detect_sse2(unsigned int cpuid_edx)
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{
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printf("scrypt: using scrypt-sse2 as built.\n");
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}
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#else
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/* Detect SSE2 */
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void (*scrypt_1024_1_1_256_sp)(const char *input, char *output, char *scratchpad);
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// By default, set to generic scrypt function. This will prevent crash in case when scrypt_detect_sse2() wasn't called
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void (*scrypt_1024_1_1_256_sp_detected)(const char *input, char *output, char *scratchpad) = &scrypt_1024_1_1_256_sp_generic;
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void scrypt_detect_sse2(unsigned int cpuid_edx)
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void scrypt_detect_sse2()
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{
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#if defined(USE_SSE2_ALWAYS)
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printf("scrypt: using scrypt-sse2 as built.\n");
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#else // USE_SSE2_ALWAYS
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// 32bit x86 Linux or Windows, detect cpuid features
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unsigned int cpuid_edx=0;
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#if defined(_MSC_VER)
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// MSVC
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int x86cpuid[4];
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__cpuid(x86cpuid, 1);
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cpuid_edx = (unsigned int)buffer[3];
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#else // _MSC_VER
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// Linux or i686-w64-mingw32 (gcc-4.6.3)
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unsigned int eax, ebx, ecx;
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__get_cpuid(1, &eax, &ebx, &ecx, &cpuid_edx);
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#endif // _MSC_VER
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if (cpuid_edx & 1<<26)
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{
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scrypt_1024_1_1_256_sp = &scrypt_1024_1_1_256_sp_sse2;
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scrypt_1024_1_1_256_sp_detected = &scrypt_1024_1_1_256_sp_sse2;
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printf("scrypt: using scrypt-sse2 as detected.\n");
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}
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else
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{
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scrypt_1024_1_1_256_sp = &scrypt_1024_1_1_256_sp_generic;
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scrypt_1024_1_1_256_sp_detected = &scrypt_1024_1_1_256_sp_generic;
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printf("scrypt: using scrypt-generic, SSE2 unavailable.\n");
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}
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#endif // USE_SSE2_ALWAYS
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}
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#endif
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#endif
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void scrypt_1024_1_1_256(const char *input, char *output)
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{
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char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
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#if defined(USE_SSE2)
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// Detection would work, but in cases where we KNOW it always has SSE2,
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// it is faster to use directly than to use a function pointer or conditional.
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#if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
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// Always SSE2: x86_64 or Intel MacOS X
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scrypt_1024_1_1_256_sp_sse2(input, output, scratchpad);
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#else
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// Detect SSE2: 32bit x86 Linux or Windows
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scrypt_1024_1_1_256_sp(input, output, scratchpad);
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#endif
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#else
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// Generic scrypt
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scrypt_1024_1_1_256_sp_generic(input, output, scratchpad);
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#endif
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}
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14
src/scrypt.h
14
src/scrypt.h
@ -2,15 +2,25 @@
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#define SCRYPT_H
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#include <stdlib.h>
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#include <stdint.h>
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static const int SCRYPT_SCRATCHPAD_SIZE = 131072 + 63;
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void scrypt_1024_1_1_256(const char *input, char *output);
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void scrypt_1024_1_1_256_sp_generic(const char *input, char *output, char *scratchpad);
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#if defined(USE_SSE2)
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extern void scrypt_detect_sse2(unsigned int cpuid_edx);
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#if defined(_M_X64) || defined(__x86_64__) || defined(_M_AMD64) || (defined(MAC_OSX) && defined(__i386__))
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#define USE_SSE2_ALWAYS 1
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#define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_sse2((input), (output), (scratchpad))
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#else
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#define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_detected((input), (output), (scratchpad))
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#endif
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void scrypt_detect_sse2();
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void scrypt_1024_1_1_256_sp_sse2(const char *input, char *output, char *scratchpad);
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extern void (*scrypt_1024_1_1_256_sp)(const char *input, char *output, char *scratchpad);
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extern void (*scrypt_1024_1_1_256_sp_detected)(const char *input, char *output, char *scratchpad);
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#else
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#define scrypt_1024_1_1_256_sp(input, output, scratchpad) scrypt_1024_1_1_256_sp_generic((input), (output), (scratchpad))
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#endif
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void
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@ -11,6 +11,9 @@ BOOST_AUTO_TEST_CASE(scrypt_hashtest)
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#define HASHCOUNT 5
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const char* inputhex[HASHCOUNT] = { "020000004c1271c211717198227392b029a64a7971931d351b387bb80db027f270411e398a07046f7d4a08dd815412a8712f874a7ebf0507e3878bd24e20a3b73fd750a667d2f451eac7471b00de6659", "0200000011503ee6a855e900c00cfdd98f5f55fffeaee9b6bf55bea9b852d9de2ce35828e204eef76acfd36949ae56d1fbe81c1ac9c0209e6331ad56414f9072506a77f8c6faf551eac7471b00389d01", "02000000a72c8a177f523946f42f22c3e86b8023221b4105e8007e59e81f6beb013e29aaf635295cb9ac966213fb56e046dc71df5b3f7f67ceaeab24038e743f883aff1aaafaf551eac7471b0166249b", "010000007824bc3a8a1b4628485eee3024abd8626721f7f870f8ad4d2f33a27155167f6a4009d1285049603888fe85a84b6c803a53305a8d497965a5e896e1a00568359589faf551eac7471b0065434e", "0200000050bfd4e4a307a8cb6ef4aef69abc5c0f2d579648bd80d7733e1ccc3fbc90ed664a7f74006cb11bde87785f229ecd366c2d4e44432832580e0608c579e4cb76f383f7f551eac7471b00c36982" };
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const char* expected[HASHCOUNT] = { "00000000002bef4107f882f6115e0b01f348d21195dacd3582aa2dabd7985806" , "00000000003a0d11bdd5eb634e08b7feddcfbbf228ed35d250daf19f1c88fc94", "00000000000b40f895f288e13244728a6c2d9d59d8aff29c65f8dd5114a8ca81", "00000000003007005891cd4923031e99d8e8d72f6e8e7edc6a86181897e105fe", "000000000018f0b426a4afc7130ccb47fa02af730d345b4fe7c7724d3800ec8c" };
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#if defined(USE_SSE2)
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scrypt_detect_sse2();
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#endif
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uint256 scrypthash;
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std::vector<unsigned char> inputbytes;
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char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
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@ -19,6 +22,7 @@ BOOST_AUTO_TEST_CASE(scrypt_hashtest)
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#if defined(USE_SSE2)
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// Test SSE2 scrypt
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scrypt_1024_1_1_256_sp_sse2((const char*)&inputbytes[0], BEGIN(scrypthash), scratchpad);
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BOOST_CHECK_EQUAL(scrypthash.ToString().c_str(), expected[i]);
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#endif
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// Test generic scrypt
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scrypt_1024_1_1_256_sp_generic((const char*)&inputbytes[0], BEGIN(scrypthash), scratchpad);
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