From b26141e2c5836ccd20bd32a9c653cf2ba5e5b5ee Mon Sep 17 00:00:00 2001
From: Jeff Garzik <jeff@garzik.org>
Date: Sun, 3 Apr 2011 14:21:52 -0400
Subject: Remove 4way SSE2 scanhash implementation.

---
 main.cpp | 82 +++-------------------------------------------------------------
 1 file changed, 3 insertions(+), 79 deletions(-)

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
index bfc45af28e..3dd512fe62 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3151,71 +3151,6 @@ void ThreadBitcoinMiner(void* parg)
     printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[3]);
 }
 
-#if defined(__GNUC__) && defined(CRYPTOPP_X86_ASM_AVAILABLE)
-void CallCPUID(int in, int& aret, int& cret)
-{
-    int a, c;
-    asm (
-        "mov %2, %%eax; " // in into eax
-        "cpuid;"
-        "mov %%eax, %0;" // eax into a
-        "mov %%ecx, %1;" // ecx into c
-        :"=r"(a),"=r"(c) /* output */
-        :"r"(in) /* input */
-        :"%eax","%ebx","%ecx","%edx" /* clobbered register */
-    );
-    aret = a;
-    cret = c;
-}
-
-bool Detect128BitSSE2()
-{
-    int a, c, nBrand;
-    CallCPUID(0, a, nBrand);
-    bool fIntel = (nBrand == 0x6c65746e); // ntel
-    bool fAMD = (nBrand == 0x444d4163); // cAMD
-
-    struct
-    {
-        unsigned int nStepping : 4;
-        unsigned int nModel : 4;
-        unsigned int nFamily : 4;
-        unsigned int nProcessorType : 2;
-        unsigned int nUnused : 2;
-        unsigned int nExtendedModel : 4;
-        unsigned int nExtendedFamily : 8;
-    }
-    cpu;
-    CallCPUID(1, a, c);
-    memcpy(&cpu, &a, sizeof(cpu));
-    int nFamily = cpu.nExtendedFamily + cpu.nFamily;
-    int nModel = cpu.nExtendedModel*16 + cpu.nModel;
-
-    // We need Intel Nehalem or AMD K10 or better for 128bit SSE2
-    // Nehalem = i3/i5/i7 and some Xeon
-    // K10 = Opterons with 4 or more cores, Phenom, Phenom II, Athlon II
-    //  Intel Core i5  family 6, model 26 or 30
-    //  Intel Core i7  family 6, model 26 or 30
-    //  Intel Core i3  family 6, model 37
-    //  AMD Phenom    family 16, model 10
-    bool fUseSSE2 = ((fIntel && nFamily * 10000 + nModel >=  60026) ||
-                     (fAMD   && nFamily * 10000 + nModel >= 160010));
-
-    // AMD reports a lower model number in 64-bit mode
-    if (fAMD && sizeof(void*) > 4 && nFamily * 10000 + nModel >= 160000)
-        fUseSSE2 = true;
-
-    static bool fPrinted;
-    if (!fPrinted)
-    {
-        fPrinted = true;
-        printf("CPUID %08x family %d, model %d, stepping %d, fUseSSE2=%d\n", nBrand, nFamily, nModel, cpu.nStepping, fUseSSE2);
-    }
-    return fUseSSE2;
-}
-#else
-bool Detect128BitSSE2() { return false; }
-#endif
 
 int FormatHashBlocks(void* pbuffer, unsigned int len)
 {
@@ -3276,9 +3211,6 @@ unsigned int ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char*
     }
 }
 
-extern unsigned int ScanHash_4WaySSE2(char* pmidstate, char* pblock, char* phash1, char* phash, unsigned int& nHashesDone);
-
-
 
 class COrphan
 {
@@ -3552,9 +3484,6 @@ void BitcoinMiner()
 {
     printf("BitcoinMiner started\n");
     SetThreadPriority(THREAD_PRIORITY_LOWEST);
-    bool f4WaySSE2 = Detect128BitSSE2();
-    if (mapArgs.count("-4way"))
-        f4WaySSE2 = GetBoolArg("-4way");
 
     // Each thread has its own key and counter
     CReserveKey reservekey;
@@ -3616,14 +3545,9 @@ void BitcoinMiner()
             unsigned int nHashesDone = 0;
             unsigned int nNonceFound;
 
-#ifdef FOURWAYSSE2
-            if (f4WaySSE2)
-                // tcatm's 4-way 128-bit SSE2 SHA-256
-                nNonceFound = ScanHash_4WaySSE2(pmidstate, pdata + 64, phash1, (char*)&hash, nHashesDone);
-            else
-#endif
-                // Crypto++ SHA-256
-                nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1, (char*)&hash, nHashesDone);
+            // Crypto++ SHA-256
+            nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
+                                            (char*)&hash, nHashesDone);
 
             // Check if something found
             if (nNonceFound != -1)
-- 
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