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Fix upper/lower_data_select; simplify value8_low.

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This commit is contained in:
Thomas Harte 2022-06-15 21:11:31 -04:00
parent 12b058867e
commit 7d00b50e13
1 changed files with 7 additions and 10 deletions
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17
Processors/68000Mk2/68000Mk2.hpp
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@ -175,17 +175,17 @@ struct Microcycle {
}
/*!
@returns non-zero if this is a byte read and 68000 LDS is asserted.
@returns non-zero if the 68000 LDS is asserted; zero otherwise.
*/
forceinline int lower_data_select() const {
return (operation & SelectByte) & ((*address & 1) << 3);
return ((operation & SelectByte) & (*address & 1)) | (operation & SelectWord);
}
/*!
@returns non-zero if this is a byte read and 68000 UDS is asserted.
@returns non-zero if the 68000 UDS is asserted; zero otherwise.
*/
forceinline int upper_data_select() const {
return (operation & SelectByte) & ~((*address & 1) << 3);
return ((operation & SelectByte) & ~(*address & 1)) | (operation & SelectWord);
}
/*!
@ -229,8 +229,7 @@ struct Microcycle {
}
/*!
@returns the value currently on the high 8 lines of the data bus if any;
@c 0xff otherwise. Assumes this is a write cycle.
@returns the value currently on the high 8 lines of the data bus.
*/
forceinline uint8_t value8_high() const {
const uint8_t values[] = { uint8_t(value->w >> 8), value->b};
@ -238,12 +237,10 @@ struct Microcycle {
}
/*!
@returns the value currently on the low 8 lines of the data bus if any;
@c 0xff otherwise. Assumes this is a write cycle.
@returns the value currently on the low 8 lines of the data bus.
*/
forceinline uint8_t value8_low() const {
const uint8_t values[] = { uint8_t(value->w), value->b};
return values[operation & SelectByte];
return value->b;
}
/*!