diff --git a/Source/Core/Core/DSP/Jit/x64/DSPJitArithmetic.cpp b/Source/Core/Core/DSP/Jit/x64/DSPJitArithmetic.cpp
index 8e54bd60aa..7d421b50a7 100644
--- a/Source/Core/Core/DSP/Jit/x64/DSPJitArithmetic.cpp
+++ b/Source/Core/Core/DSP/Jit/x64/DSPJitArithmetic.cpp
@@ -701,9 +701,7 @@ void DSPEmitter::addi(const UDSPInstruction opc)
   //	s64 imm = (s16)dsp_fetch_code();
   s16 imm = dsp_imem_read(m_compile_pc + 1);
   // imm <<= 16;
-  MOV(16, R(RDX), Imm16(imm));
-  MOVSX(64, 16, RDX, R(RDX));
-  SHL(64, R(RDX), Imm8(16));
+  MOV(64, R(RDX), Imm32(imm << 16));
   //	s64 res = acc + imm;
   ADD(64, R(RAX), R(RDX));
   //	dsp_set_long_acc(areg, res);
@@ -737,9 +735,8 @@ void DSPEmitter::addis(const UDSPInstruction opc)
   MOV(64, R(RAX), R(tmp1));
   //	s64 imm = (s8)(u8)opc;
   //	imm <<= 16;
-  MOV(8, R(RDX), Imm8((u8)opc));
-  MOVSX(64, 8, RDX, R(RDX));
-  SHL(64, R(RDX), Imm8(16));
+  s32 imm = static_cast<u8>(opc) << 24 >> 8;
+  MOV(64, R(RDX), Imm32(imm));
   //	s64 res = acc + imm;
   ADD(64, R(RAX), R(RDX));
   //	dsp_set_long_acc(dreg, res);
diff --git a/Source/Core/Core/DSP/Jit/x64/DSPJitUtil.cpp b/Source/Core/Core/DSP/Jit/x64/DSPJitUtil.cpp
index 630fc249d5..00bfe715a3 100644
--- a/Source/Core/Core/DSP/Jit/x64/DSPJitUtil.cpp
+++ b/Source/Core/Core/DSP/Jit/x64/DSPJitUtil.cpp
@@ -317,12 +317,11 @@ void DSPEmitter::increment_addr_reg(int reg)
   m_gpr.PutReg(DSP_REG_WR0 + reg, false);
 
   const OpArg ar_reg = m_gpr.GetReg(DSP_REG_AR0 + reg);
-  MOVZX(32, 16, EAX, ar_reg);
-
   X64Reg tmp1 = m_gpr.GetFreeXReg();
+  MOVZX(32, 16, tmp1, ar_reg);
+
   // u32 nar = ar + 1;
-  MOV(32, R(tmp1), R(EAX));
-  ADD(32, R(EAX), Imm8(1));
+  LEA(32, EAX, MDisp(tmp1, 1));
 
   // if ((nar ^ ar) > ((wr | 1) << 1))
   //		nar -= wr + 1;
@@ -666,28 +665,12 @@ void DSPEmitter::get_long_prod(X64Reg long_prod)
 }
 
 // Returns s64 in RAX
-// Clobbers RCX
 void DSPEmitter::get_long_prod_round_prodl(X64Reg long_prod)
 {
   // s64 prod = dsp_get_long_prod();
   get_long_prod(long_prod);
 
-  X64Reg tmp = m_gpr.GetFreeXReg();
-  // if (prod & 0x10000) prod = (prod + 0x8000) & ~0xffff;
-  TEST(32, R(long_prod), Imm32(0x10000));
-  FixupBranch jump = J_CC(CC_Z);
-  ADD(64, R(long_prod), Imm32(0x8000));
-  MOV(64, R(tmp), Imm64(~0xffff));
-  AND(64, R(long_prod), R(tmp));
-  FixupBranch _ret = J();
-  // else prod = (prod + 0x7fff) & ~0xffff;
-  SetJumpTarget(jump);
-  ADD(64, R(long_prod), Imm32(0x7fff));
-  MOV(64, R(tmp), Imm64(~0xffff));
-  AND(64, R(long_prod), R(tmp));
-  SetJumpTarget(_ret);
-  // return prod;
-  m_gpr.PutXReg(tmp);
+  round_long_acc(long_prod);
 }
 
 // For accurate emulation, this is wrong - but the real prod registers behave
@@ -708,22 +691,13 @@ void DSPEmitter::set_long_prod()
 }
 
 // Returns s64 in RAX
-// Clobbers RCX
 void DSPEmitter::round_long_acc(X64Reg long_acc)
 {
   // if (prod & 0x10000) prod = (prod + 0x8000) & ~0xffff;
-  TEST(32, R(long_acc), Imm32(0x10000));
-  FixupBranch jump = J_CC(CC_Z);
-  ADD(64, R(long_acc), Imm32(0x8000));
-  MOV(64, R(ECX), Imm64(~0xffff));
-  AND(64, R(long_acc), R(RCX));
-  FixupBranch _ret = J();
   // else prod = (prod + 0x7fff) & ~0xffff;
-  SetJumpTarget(jump);
-  ADD(64, R(long_acc), Imm32(0x7fff));
-  MOV(64, R(RCX), Imm64(~0xffff));
-  AND(64, R(long_acc), R(RCX));
-  SetJumpTarget(_ret);
+  BT(32, R(long_acc), Imm8(16));
+  ADC(64, R(long_acc), Imm32(0x7FFF));
+  XOR(16, R(long_acc), R(long_acc));
   // return prod;
 }
 
diff --git a/Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp b/Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp
index 81b4b27204..70224162f0 100644
--- a/Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp
+++ b/Source/Core/Core/PowerPC/Jit64Common/Jit64AsmCommon.cpp
@@ -101,8 +101,8 @@ void CommonAsmRoutines::GenFrsqrte()
   MOVQ_xmm(XMM0, R(RSCRATCH));
   RET();
   SetJumpTarget(inf);
-  BT(64, R(RSCRATCH), Imm8(63));
-  FixupBranch negative = J_CC(CC_C);
+  TEST(64, R(RSCRATCH), R(RSCRATCH));
+  FixupBranch negative = J_CC(CC_S);
   XORPD(XMM0, R(XMM0));
   RET();