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More canonical test for oVerflow

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This commit is contained in:
Aaron Culliney
2015-02-19 20:13:13 -08:00
parent 59d151d684
commit 41b8ca7700
1 changed files with 10 additions and 18 deletions
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28
src/test/testcpu.c
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@@ -188,8 +188,8 @@ static void logic_ADC(/*uint8_t*/int _a, /*uint8_t*/int _b, uint8_t *result, uin
int8_t a = (int8_t)_a;
int8_t b = (int8_t)_b;
bool is_neg = (a < 0);
bool is_negb = (b < 0);
bool signA = a>>7;
bool signB = b>>7;
int8_t carry = (*flags & fC) ? 1 : 0;
*flags &= ~fC;
@@ -208,13 +208,9 @@ static void logic_ADC(/*uint8_t*/int _a, /*uint8_t*/int _b, uint8_t *result, uin
*flags |= fC;
}
if ( is_neg && is_negb ) {
if (a < res) {
*flags |= fV;
}
}
if ( !is_neg && !is_negb ) {
if (a > res) {
if (signA == signB) {
uint8_t signResult = (res&0xff)>>7;
if (signA != signResult) {
*flags |= fV;
}
}
@@ -5773,8 +5769,8 @@ static void logic_SBC(/*uint8_t*/int _a, /*uint8_t*/int _b, uint8_t *result, uin
int8_t a = (int8_t)_a;
int8_t b = (int8_t)_b;
bool is_neg = (a < 0);
bool is_negb = (b < 0);
bool signA = a>>7;
bool signB = b>>7;
int8_t borrow = ((*flags & fC) == 0x0) ? 1 : 0;
*flags |= fC;
@@ -5792,13 +5788,9 @@ static void logic_SBC(/*uint8_t*/int _a, /*uint8_t*/int _b, uint8_t *result, uin
*flags &= ~fC;
}
if ( !is_neg && is_negb ) {
if (a > res) {
*flags |= fV;
}
}
if ( is_neg && !is_negb ) {
if (a < res) {
if (signA != signB) {
uint8_t signResult = (res&0xff)>>7;
if (signA != signResult) {
*flags |= fV;
}
}