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diff --git a/source/mupen64plus-core/src/r4300/x86_64/gcop1.c b/source/mupen64plus-core/src/r4300/x86_64/gcop1.c
new file mode 100644
index 0000000..8ec5623
--- /dev/null
+++ b/source/mupen64plus-core/src/r4300/x86_64/gcop1.c
@@ -0,0 +1,154 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ *   Mupen64plus - gcop1.c                                                 *
+ *   Mupen64Plus homepage: http://code.google.com/p/mupen64plus/           *
+ *   Copyright (C) 2007 Richard Goedeken (Richard42)                       *
+ *   Copyright (C) 2002 Hacktarux                                          *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include <stdio.h>
+
+#include "assemble.h"
+#include "interpret.h"
+
+#include "r4300/recomph.h"
+#include "r4300/recomp.h"
+#include "r4300/r4300.h"
+#include "r4300/ops.h"
+#include "r4300/macros.h"
+
+#include "memory/memory.h"
+
+void genmfc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[111]);
+#endif
+#ifdef INTERPRET_MFC1
+   gencallinterp((unsigned long long)cached_interpreter_table.MFC1, 0);
+#else
+   gencheck_cop1_unusable();
+   mov_xreg64_m64rel(RAX, (unsigned long long *)(&reg_cop1_simple[dst->f.r.nrd]));
+   mov_reg32_preg64(EBX, RAX);
+   mov_m32rel_xreg32((unsigned int*)dst->f.r.rt, EBX);
+   sar_reg32_imm8(EBX, 31);
+   mov_m32rel_xreg32(((unsigned int*)dst->f.r.rt)+1, EBX);
+#endif
+}
+
+void gendmfc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[112]);
+#endif
+#ifdef INTERPRET_DMFC1
+   gencallinterp((unsigned long long)cached_interpreter_table.DMFC1, 0);
+#else
+   gencheck_cop1_unusable();
+   mov_xreg64_m64rel(RAX, (unsigned long long *) (&reg_cop1_double[dst->f.r.nrd]));
+   mov_reg32_preg64(EBX, RAX);
+   mov_reg32_preg64pimm32(ECX, RAX, 4);
+   mov_m32rel_xreg32((unsigned int*)dst->f.r.rt, EBX);
+   mov_m32rel_xreg32(((unsigned int*)dst->f.r.rt)+1, ECX);
+#endif
+}
+
+void gencfc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[113]);
+#endif
+#ifdef INTERPRET_CFC1
+   gencallinterp((unsigned long long)cached_interpreter_table.CFC1, 0);
+#else
+   gencheck_cop1_unusable();
+   if(dst->f.r.nrd == 31) mov_xreg32_m32rel(EAX, (unsigned int*)&FCR31);
+   else mov_xreg32_m32rel(EAX, (unsigned int*)&FCR0);
+   mov_m32rel_xreg32((unsigned int*)dst->f.r.rt, EAX);
+   sar_reg32_imm8(EAX, 31);
+   mov_m32rel_xreg32(((unsigned int*)dst->f.r.rt)+1, EAX);
+#endif
+}
+
+void genmtc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[114]);
+#endif
+#ifdef INTERPRET_MTC1
+   gencallinterp((unsigned long long)cached_interpreter_table.MTC1, 0);
+#else
+   gencheck_cop1_unusable();
+   mov_xreg32_m32rel(EAX, (unsigned int*)dst->f.r.rt);
+   mov_xreg64_m64rel(RBX, (unsigned long long *)(&reg_cop1_simple[dst->f.r.nrd]));
+   mov_preg64_reg32(RBX, EAX);
+#endif
+}
+
+void gendmtc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[115]);
+#endif
+#ifdef INTERPRET_DMTC1
+   gencallinterp((unsigned long long)cached_interpreter_table.DMTC1, 0);
+#else
+   gencheck_cop1_unusable();
+   mov_xreg32_m32rel(EAX, (unsigned int*)dst->f.r.rt);
+   mov_xreg32_m32rel(EBX, ((unsigned int*)dst->f.r.rt)+1);
+   mov_xreg64_m64rel(RDX, (unsigned long long *)(&reg_cop1_double[dst->f.r.nrd]));
+   mov_preg64_reg32(RDX, EAX);
+   mov_preg64pimm32_reg32(RDX, 4, EBX);
+#endif
+}
+
+void genctc1(void)
+{
+#if defined(COUNT_INSTR)
+   inc_m32rel(&instr_count[116]);
+#endif
+#ifdef INTERPRET_CTC1
+   gencallinterp((unsigned long long)cached_interpreter_table.CTC1, 0);
+#else
+   gencheck_cop1_unusable();
+   
+   if (dst->f.r.nrd != 31) return;
+   mov_xreg32_m32rel(EAX, (unsigned int*)dst->f.r.rt);
+   mov_m32rel_xreg32((unsigned int*)&FCR31, EAX);
+   and_eax_imm32(3);
+   
+   cmp_eax_imm32(0);
+   jne_rj(13);
+   mov_m32rel_imm32((unsigned int*)&rounding_mode, 0x33F); // 11
+   jmp_imm_short(51); // 2
+   
+   cmp_eax_imm32(1); // 5
+   jne_rj(13); // 2
+   mov_m32rel_imm32((unsigned int*)&rounding_mode, 0xF3F); // 11
+   jmp_imm_short(31); // 2
+   
+   cmp_eax_imm32(2); // 5
+   jne_rj(13); // 2
+   mov_m32rel_imm32((unsigned int*)&rounding_mode, 0xB3F); // 11
+   jmp_imm_short(11); // 2
+   
+   mov_m32rel_imm32((unsigned int*)&rounding_mode, 0x73F); // 11
+   
+   fldcw_m16rel((unsigned short*)&rounding_mode);
+#endif
+}
+