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Jonas Quinn's fix for negative SA1 division.

This commit is contained in:
Brandon Wright 2018-04-08 10:30:22 -05:00
parent 94d9416d40
commit cfa6ab1c84
1 changed files with 4 additions and 2 deletions
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6
sa1.cpp
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@ -741,8 +741,10 @@ void S9xSetSA1 (uint8 byte, uint32 address)
SA1.sum = 0; SA1.sum = 0;
else else
{ {
int16 quotient = (int16) SA1.op1 / (uint16) SA1.op2; int16 dividend = (int16) SA1.op1;
uint16 remainder = (int16) SA1.op1 % (uint16) SA1.op2; uint16 divisor = (uint16) SA1.op2;
uint16 remainder = (dividend >= 0) ? dividend % divisor : (dividend % divisor) + divisor;
uint16 quotient = (dividend - remainder) / divisor;
SA1.sum = (remainder << 16) | quotient; SA1.sum = (remainder << 16) | quotient;
} }