Support FISTP m32int

captainys · Jan 17, 2022 · 2530fd8 · 2530fd8
1 parent 8736d85
commit 2530fd8
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/scripts/FB386.py b/scripts/FB386.py
@@ -51,6 +51,7 @@ def Run(argv):
 		"../testdata/CMOS.bin",
 		"-DONTAUTOSAVECMOS",
 		# "-PAUSE",
+		"-USEFPU",
 	]+argv).wait()
 
 

diff --git a/src/cpu/i486inst.cpp b/src/cpu/i486inst.cpp
@@ -6330,7 +6330,6 @@ unsigned int i486DX::RunOneInstruction(Memory &mem,InOut &io)
 		{
 			switch(Instruction::GetREG(inst.operand[0]))
 			{
-			case 3: // FISTP m32int
 			case 1:
 			case 2:
 			case 4:
@@ -6343,6 +6342,16 @@ unsigned int i486DX::RunOneInstruction(Memory &mem,InOut &io)
 					clocksPassed=state.fpuState.FILD_m32int(*this,value.byteData);
 				}
 				break;
+			case 3: // FISTP m32int
+				{
+					OperandValue value;
+					state.fpuState.GetSTAsSignedInt(*this,value);
+					state.fpuState.Pop(*this);
+					value.numBytes=4;
+					StoreOperandValue(op1,mem,inst.addressSize,inst.segOverride,value);
+					clocksPassed=33;
+				}
+				break;
 			case 5: // FLD m80real
 				{
 					auto value=EvaluateOperand80(mem,inst.addressSize,inst.segOverride,op1);