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ppcfpopcodes: refactor fctiw/fctiwz emulation.

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This commit is contained in:
Maxim Poliakovski 2024-01-02 21:45:29 +01:00
parent 0100e67ebf
commit 9b30dfb474
1 changed files with 28 additions and 74 deletions
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102
cpu/ppc/ppcfpopcodes.cpp
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@ -626,46 +626,39 @@ void dppc_interpreter::ppc_fres() {
ppc_update_cr1();
}
void dppc_interpreter::ppc_fctiw() {
static void round_to_int(const uint8_t mode) {
ppc_grab_regsfpdb();
double val_reg_b = GET_FPR(reg_b);
if (std::isnan(val_reg_b)) {
if (ppc_state.fpr[reg_b].int64_r & 0x0008000000000000) {
// isqnan
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
}
else {
// issnan
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI | FPSCR::VXSNAN;
}
ppc_state.fpscr &= ~(FPSCR::FR | FPSCR::FI);
ppc_state.fpscr |= (FPSCR::VXCVI | FPSCR::VX);
if (!(ppc_state.fpr[reg_b].int64_r & 0x0008000000000000)) // issnan
ppc_state.fpscr |= FPSCR::VXSNAN;
if (ppc_state.fpscr & FPSCR::VE) {
ppc_state.fpscr |= FPSCR::FEX; // VX=1 and VE=1 cause FEX to be set
ppc_floating_point_exception();
} else {
ppc_state.fpr[reg_d].int64_r = 0xFFF8000080000000ULL;
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff8000080000000;
}
}
else if (val_reg_b > static_cast<double>(0x7fffffff)) {
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
} else if (val_reg_b > static_cast<double>(0x7fffffff) ||
val_reg_b < -static_cast<double>(0x80000000)) {
ppc_state.fpscr &= ~(FPSCR::FR | FPSCR::FI);
ppc_state.fpscr |= (FPSCR::VXCVI | FPSCR::VX);
if (ppc_state.fpscr & FPSCR::VE) {
ppc_state.fpscr |= FPSCR::FEX; // VX=1 and VE=1 cause FEX to be set
ppc_floating_point_exception();
} else {
if (val_reg_b >= 0.0f)
ppc_state.fpr[reg_d].int64_r = 0xFFF800007FFFFFFFULL;
else
ppc_state.fpr[reg_d].int64_r = 0xFFF8000080000000ULL;
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff800007fffffff;
}
}
else if (val_reg_b < -static_cast<double>(0x80000000)) {
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
if (ppc_state.fpscr & FPSCR::VE) {
ppc_floating_point_exception();
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff8000080000000;
}
}
else {
switch (ppc_state.fpscr & 0x3) {
} else {
switch (mode & 0x3) {
case 0:
ppc_result64_d = round_to_nearest(val_reg_b);
break;
@ -687,51 +680,12 @@ void dppc_interpreter::ppc_fctiw() {
ppc_update_cr1();
}
void dppc_interpreter::ppc_fctiw() {
round_to_int(ppc_state.fpscr & 0x3);
}
void dppc_interpreter::ppc_fctiwz() {
ppc_grab_regsfpdb();
double val_reg_b = GET_FPR(reg_b);
if (std::isnan(val_reg_b)) {
if (ppc_state.fpr[reg_b].int64_r & 0x0008000000000000) {
// isqnan
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
}
else {
// issnan
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI | FPSCR::VXSNAN;
}
if (ppc_state.fpscr & FPSCR::VE) {
ppc_floating_point_exception();
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff8000080000000;
}
}
else if (val_reg_b > static_cast<double>(0x7fffffff)) {
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
if (ppc_state.fpscr & FPSCR::VE) {
ppc_floating_point_exception();
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff800007fffffff;
}
}
else if (val_reg_b < -static_cast<double>(0x80000000)) {
ppc_state.fpscr = (ppc_state.fpscr & ~(FPSCR::FR | FPSCR::FI)) | FPSCR::VXCVI;
if (ppc_state.fpscr & FPSCR::VE) {
ppc_floating_point_exception();
}
else {
ppc_state.fpr[reg_d].int64_r = 0xfff8000080000000;
}
}
else {
uint64_t ppc_result64_d = round_to_zero(val_reg_b);
ppc_store_dfpresult_int(reg_d);
}
if (rc_flag)
ppc_update_cr1();
round_to_int(1);
}
// Floating Point Store and Load