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dyncom: Implement SMLAD/SMUAD/SMLSD/SMUSD

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This commit is contained in:
Lioncash 2015-01-02 18:21:45 -05:00
parent 092a67cefb
commit 3337b84620
5 changed files with 84 additions and 50 deletions
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8
src/core/arm/interpreter/armsupp.cpp
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@ -453,12 +453,14 @@ ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result)
ASSIGNV (AddOverflow (a, b, result));
}
/* Assigns the Q flag if the given result is considered an overflow from the addition of a and b */
void ARMul_AddOverflowQ(ARMul_State* state, ARMword a, ARMword b)
// Returns true if the Q flag should be set as a result of overflow.
bool ARMul_AddOverflowQ(ARMword a, ARMword b)
{
u32 result = a + b;
if (((result ^ a) & (u32)0x80000000) && ((a ^ b) & (u32)0x80000000) == 0)
SETQ;
return true;
return false;
}
/* Assigns the C flag after an subtraction of a and b to give result. */