Interpreter_FloatingPoint: Handle cases when FPSCR.VE is set and exceptions occur in fctiw and fctiwz
If invalid operation exceptions are enabled and an invalid operation occurs, then the destination value remains untouched. This fixes issues that may arise when using these two instructions where the destination gets steamrolled by an infinity or NaN value.
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@ -29,6 +29,7 @@ void ConvertToInteger(UGeckoInstruction inst, RoundingMode rounding_mode)
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{
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const double b = rPS0(inst.FB);
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u32 value;
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bool exception_occurred = false;
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if (std::isnan(b))
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{
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@ -37,24 +38,21 @@ void ConvertToInteger(UGeckoInstruction inst, RoundingMode rounding_mode)
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value = 0x80000000;
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SetFPException(FPSCR_VXCVI);
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FPSCR.FI = 0;
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FPSCR.FR = 0;
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exception_occurred = true;
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}
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else if (b > static_cast<double>(0x7fffffff))
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{
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// Positive large operand or +inf
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value = 0x7fffffff;
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SetFPException(FPSCR_VXCVI);
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FPSCR.FI = 0;
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FPSCR.FR = 0;
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exception_occurred = true;
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}
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else if (b < -static_cast<double>(0x80000000))
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{
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// Negative large operand or -inf
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value = 0x80000000;
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SetFPException(FPSCR_VXCVI);
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FPSCR.FI = 0;
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FPSCR.FR = 0;
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exception_occurred = true;
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}
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else
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{
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@ -105,11 +103,21 @@ void ConvertToInteger(UGeckoInstruction inst, RoundingMode rounding_mode)
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}
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}
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if (exception_occurred)
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{
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FPSCR.FI = 0;
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FPSCR.FR = 0;
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}
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if (!exception_occurred || FPSCR.VE == 0)
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{
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// Based on HW tests
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// FPRF is not affected
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riPS0(inst.FD) = 0xfff8000000000000ull | value;
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if (value == 0 && std::signbit(b))
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riPS0(inst.FD) |= 0x100000000ull;
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}
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if (inst.Rc)
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Helper_UpdateCR1();
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}
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