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Try to avoid so many virtual calls in the Z80 by hanging onto AF a little longer.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2018-01-09 23:30:51 +00:00
parent 0a2873c40d
commit 3bd01e211e
2 changed files with 13 additions and 15 deletions
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6
Z80/inc/Z80.h
View File

@ -302,9 +302,9 @@ namespace EightBit {
static void subtract(uint8_t& f, uint8_t& operand, uint8_t value, int carry = 0);
void executeCB(int x, int y, int z);
void executeED(int x, int y, int z, int p, int q);
void executeOther(int x, int y, int z, int p, int q);
void executeCB(uint8_t& a, uint8_t& f, int x, int y, int z);
void executeED(uint8_t& a, uint8_t& f, int x, int y, int z, int p, int q);
void executeOther(uint8_t& a, uint8_t& f, int x, int y, int z, int p, int q);
static void increment(uint8_t& f, uint8_t& operand);
static void decrement(uint8_t& f, uint8_t& operand);

22
Z80/src/Z80.cpp
View File

@ -710,14 +710,18 @@ int EightBit::Z80::execute(const uint8_t opcode) {
const auto p = decoded.p;
const auto q = decoded.q;
auto& af = AF();
auto& a = af.high;
auto& f = af.low;
auto prefixed = m_prefixCB || m_prefixED;
if (LIKELY(!prefixed)) {
executeOther(x, y, z, p, q);
executeOther(a, f, x, y, z, p, q);
} else {
if (m_prefixCB)
executeCB(x, y, z);
executeCB(a, f, x, y, z);
else if (m_prefixED)
executeED(x, y, z, p, q);
executeED(a, f, x, y, z, p, q);
else
UNREACHABLE;
}
@ -728,9 +732,7 @@ int EightBit::Z80::execute(const uint8_t opcode) {
return cycles();
}
void EightBit::Z80::executeCB(const int x, const int y, const int z) {
auto& a = A();
auto& f = F();
void EightBit::Z80::executeCB(uint8_t& a, uint8_t& f, const int x, const int y, const int z) {
switch (x) {
case 0: { // rot[y] r[z]
auto operand = LIKELY(!m_displaced) ? R(z, a) : getByte(displacedAddress());
@ -824,9 +826,7 @@ void EightBit::Z80::executeCB(const int x, const int y, const int z) {
}
}
void EightBit::Z80::executeED(const int x, const int y, const int z, const int p, const int q) {
auto& a = A();
auto& f = F();
void EightBit::Z80::executeED(uint8_t& a, uint8_t& f, const int x, const int y, const int z, const int p, const int q) {
switch (x) {
case 0:
case 3: // Invalid instruction, equivalent to NONI followed by NOP
@ -1060,9 +1060,7 @@ void EightBit::Z80::executeED(const int x, const int y, const int z, const int p
}
}
void EightBit::Z80::executeOther(const int x, const int y, const int z, const int p, const int q) {
auto& a = A();
auto& f = F();
void EightBit::Z80::executeOther(uint8_t& a, uint8_t& f, const int x, const int y, const int z, const int p, const int q) {
switch (x) {
case 0:
switch (z) {