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dyncom: Implement QADD/QSUB/QDADD/QDSUB

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This commit is contained in:
Lioncash 2015-01-05 09:10:59 -05:00
parent b058ce6feb
commit d00c22c706
4 changed files with 117 additions and 25 deletions
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20
src/core/arm/interpreter/armsupp.cpp
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@ -418,22 +418,18 @@ ARMul_NegZero (ARMul_State * state, ARMword result)
}
}
/* Compute whether an addition of A and B, giving RESULT, overflowed. */
int
AddOverflow (ARMword a, ARMword b, ARMword result)
// Compute whether an addition of A and B, giving RESULT, overflowed.
bool AddOverflow(ARMword a, ARMword b, ARMword result)
{
return ((NEG (a) && NEG (b) && POS (result))
|| (POS (a) && POS (b) && NEG (result)));
return ((NEG(a) && NEG(b) && POS(result)) ||
(POS(a) && POS(b) && NEG(result)));
}
/* Compute whether a subtraction of A and B, giving RESULT, overflowed. */
int
SubOverflow (ARMword a, ARMword b, ARMword result)
// Compute whether a subtraction of A and B, giving RESULT, overflowed.
bool SubOverflow(ARMword a, ARMword b, ARMword result)
{
return ((NEG (a) && POS (b) && POS (result))
|| (POS (a) && NEG (b) && NEG (result)));
return ((NEG(a) && POS(b) && POS(result)) ||
(POS(a) && NEG(b) && NEG(result)));
}
/* Assigns the C flag after an addition of a and b to give result. */