Merge pull request #9974 from JosJuice/jitarm64-mtfsfix

JitArm64: Implement mtfsfix
dolphin-emu · Jul 31, 2021 · bef1fdb · bef1fdb
2 parents b6bd3fc + 0e62dac
commit bef1fdb
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Showing 3 changed files with 38 additions and 1 deletion.
diff --git a/Source/Core/Core/PowerPC/JitArm64/Jit.h b/Source/Core/Core/PowerPC/JitArm64/Jit.h
@@ -121,6 +121,7 @@ class JitArm64 : public JitBase, public Arm64Gen::ARM64CodeBlock, public CommonA
   void mffsx(UGeckoInstruction inst);
   void mtfsb0x(UGeckoInstruction inst);
   void mtfsb1x(UGeckoInstruction inst);
+  void mtfsfix(UGeckoInstruction inst);
 
   // LoadStore
   void lXX(UGeckoInstruction inst);

diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_SystemRegisters.cpp
@@ -816,3 +816,39 @@ void JitArm64::mtfsb1x(UGeckoInstruction inst)
   if (inst.CRBD >= 29)
     UpdateRoundingMode();
 }
+
+void JitArm64::mtfsfix(UGeckoInstruction inst)
+{
+  INSTRUCTION_START
+  JITDISABLE(bJITSystemRegistersOff);
+  FALLBACK_IF(inst.Rc);
+
+  u8 imm = (inst.hex >> (31 - 19)) & 0xF;
+  u8 shift = 28 - 4 * inst.CRFD;
+
+  ARM64Reg WA = gpr.GetReg();
+  LDR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
+
+  if (imm == 0xF)
+  {
+    ORR(WA, WA, LogicalImm(0xF << shift, 32));
+  }
+  else if (imm == 0x0)
+  {
+    BFI(WA, ARM64Reg::WZR, shift, 4);
+  }
+  else
+  {
+    ARM64Reg WB = gpr.GetReg();
+    MOVZ(WB, imm);
+    BFI(WA, WB, shift, 4);
+    gpr.Unlock(WB);
+  }
+
+  STR(IndexType::Unsigned, WA, PPC_REG, PPCSTATE_OFF(fpscr));
+  gpr.Unlock(WA);
+
+  // Field 7 contains NI and RN.
+  if (inst.CRFD == 7)
+    UpdateRoundingMode();
+}
diff --git a/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp b/Source/Core/Core/PowerPC/JitArm64/JitArm64_Tables.cpp
@@ -318,7 +318,7 @@ constexpr std::array<GekkoOPTemplate, 15> table63{{
     {583, &JitArm64::mffsx},                  // mffsx
     {70, &JitArm64::mtfsb0x},                 // mtfsb0x
     {38, &JitArm64::mtfsb1x},                 // mtfsb1x
-    {134, &JitArm64::FallBackToInterpreter},  // mtfsfix
+    {134, &JitArm64::mtfsfix},                // mtfsfix
     {711, &JitArm64::FallBackToInterpreter},  // mtfsfx
 }};