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ppcfpopcodes: Make fctiw* results QNaN.

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joevt 2024-02-05 06:09:49 -08:00 committed by dingusdev
parent 6c49b87a06
commit a7e6ab33a1
1 changed files with 10 additions and 8 deletions
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18
cpu/ppc/ppcfpopcodes.cpp
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@ -122,7 +122,7 @@ inline void ppc_update_cr1() {
((ppc_state.fpscr >> 4) & CR_select::CR1_field); ((ppc_state.fpscr >> 4) & CR_select::CR1_field);
} }
int64_t round_to_nearest(double f) { int32_t round_to_nearest(double f) {
if (f >= 0.0) { if (f >= 0.0) {
return static_cast<int32_t>(static_cast<int64_t> (std::ceil(f))); return static_cast<int32_t>(static_cast<int64_t> (std::ceil(f)));
} else { } else {
@ -154,15 +154,15 @@ void update_fpscr(uint32_t new_fpscr) {
ppc_state.fpscr = new_fpscr; ppc_state.fpscr = new_fpscr;
} }
int64_t round_to_zero(double f) { int32_t round_to_zero(double f) {
return static_cast<int32_t>(std::trunc(f)); return static_cast<int32_t>(std::trunc(f));
} }
int64_t round_to_pos_inf(double f) { int32_t round_to_pos_inf(double f) {
return static_cast<int32_t>(std::ceil(f)); return static_cast<int32_t>(std::ceil(f));
} }
int64_t round_to_neg_inf(double f) { int32_t round_to_neg_inf(double f) {
return static_cast<int32_t>(std::floor(f)); return static_cast<int32_t>(std::floor(f));
} }
@ -663,19 +663,21 @@ static void round_to_int(const uint8_t mode) {
} else { } else {
switch (mode & 0x3) { switch (mode & 0x3) {
case 0: case 0:
ppc_result64_d = round_to_nearest(val_reg_b); ppc_result64_d = (uint32_t)round_to_nearest(val_reg_b);
break; break;
case 1: case 1:
ppc_result64_d = round_to_zero(val_reg_b); ppc_result64_d = (uint32_t)round_to_zero(val_reg_b);
break; break;
case 2: case 2:
ppc_result64_d = round_to_pos_inf(val_reg_b); ppc_result64_d = (uint32_t)round_to_pos_inf(val_reg_b);
break; break;
case 3: case 3:
ppc_result64_d = round_to_neg_inf(val_reg_b); ppc_result64_d = (uint32_t)round_to_neg_inf(val_reg_b);
break; break;
} }
ppc_result64_d |= 0xFFF8000000000000ULL;
ppc_store_dfpresult_int(reg_d); ppc_store_dfpresult_int(reg_d);
} }