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dingusppc
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Started refactoring fctiw and fctiwz

This commit is contained in:
dingusdev 2021-02-05 12:45:57 -07:00
parent a4eb658309
commit 19ca37c4ba
1 changed files with 48 additions and 17 deletions
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65
cpu/ppc/ppcfpopcodes.cpp
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@ -161,22 +161,22 @@ void ppc_divbyzero(uint64_t input_a, uint64_t input_b, bool is_single) {
int64_t round_to_nearest(double f) {
if (f >= 0.0) {
return (int32_t)(int64_t)(f + 0.5);
return static_cast<int32_t>(static_cast<int64_t> (f + 0.5));
} else {
return (int32_t)(-(int64_t)(-f + 0.5));
return static_cast<int32_t>(static_cast<int64_t> (-f + 0.5));
}
}
int64_t round_to_zero(double f) {
return (int32_t)(f);
return static_cast<int32_t>(trunc(f));
}
int64_t round_to_pos_inf(double f) {
return (int32_t)(ceil(f));
return static_cast<int32_t>(ceil(f));
}
int64_t round_to_neg_inf(double f) {
return (int32_t)(floor(f));
return static_cast<int32_t>(floor(f));
}
void ppc_toggle_fpscr_fex() {
@ -671,18 +671,33 @@ void dppc_interpreter::ppc_fctiw() {
ppc_grab_regsfpdb();
double val_reg_b = GET_FPR(reg_b);
switch (ppc_state.fpscr & 0x3) {
case 0:
ppc_result64_d = round_to_nearest(val_reg_b);
case 1:
ppc_result64_d = round_to_zero(val_reg_b);
case 2:
ppc_result64_d = round_to_pos_inf(val_reg_b);
case 3:
ppc_result64_d = round_to_neg_inf(val_reg_b);
if (std::isnan(val_reg_b)) {
ppc_state.fpr[reg_d].int64_r = 0x80000000;
ppc_state.fpscr |= 0x1000100;
}
else if (val_reg_b > static_cast<double>(0x7fffffff)) {
ppc_state.fpr[reg_d].int64_r = 0x7fffffff;
ppc_state.fpscr |= 0x100;
}
else if (val_reg_b < -static_cast<double>(0x80000000)) {
ppc_state.fpr[reg_d].int64_r = 0x80000000;
ppc_state.fpscr |= 0x100;
}
else {
switch (ppc_state.fpscr & 0x3) {
case 0:
ppc_result64_d = round_to_nearest(val_reg_b);
case 1:
ppc_result64_d = round_to_zero(val_reg_b);
case 2:
ppc_result64_d = round_to_pos_inf(val_reg_b);
case 3:
ppc_result64_d = round_to_neg_inf(val_reg_b);
}
ppc_store_dfpresult_int(reg_d);
ppc_store_dfpresult_int(reg_d);
}
if (rc_flag)
ppc_changecrf1();
@ -690,9 +705,25 @@ void dppc_interpreter::ppc_fctiw() {
void dppc_interpreter::ppc_fctiwz() {
ppc_grab_regsfpdb();
ppc_result64_d = round_to_zero(GET_FPR(reg_b));
double val_reg_b = GET_FPR(reg_b);
ppc_store_dfpresult_int(reg_d);
if (std::isnan(val_reg_b)) {
ppc_state.fpr[reg_d].int64_r = 0x80000000;
ppc_state.fpscr |= 0x1000100;
}
else if (val_reg_b > static_cast<double>(0x7fffffff)) {
ppc_state.fpr[reg_d].int64_r = 0x7fffffff;
ppc_state.fpscr |= 0x100;
}
else if (val_reg_b < -static_cast<double>(0x80000000)) {
ppc_state.fpr[reg_d].int64_r = 0x80000000;
ppc_state.fpscr |= 0x100;
}
else {
ppc_result64_d = round_to_zero(val_reg_b);
ppc_store_dfpresult_int(reg_d);
}
if (rc_flag)
ppc_changecrf1();