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ppcfpopcodes: fneg fix.

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fneg inverts the sign bit regardless of nan status.
This commit is contained in:
joevt 2024-11-27 04:31:36 -08:00 committed by dingusdev
parent b38b1731a0
commit d41287c320
2 changed files with 8 additions and 12 deletions
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15
cpu/ppc/ppcfpopcodes.cpp
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@ -816,18 +816,11 @@ template <field_rc rec>
void dppc_interpreter::ppc_fneg() {
ppc_grab_regsfpdb(ppc_cur_instruction);
double ppc_dblresult64_d = -(GET_FPR(reg_b));
uint64_t ppc_result64_d = FPR_INT(reg_b) ^ 0x8000000000000000U;
if (std::isnan(GET_FPR(reg_b))) {
ppc_dblresult64_d = std::numeric_limits<double>::quiet_NaN();
}
if (snan_single_check(reg_b)) {
uint64_t qnan = 0x7FFC000000000000;
ppc_store_fpresult_int(reg_d, qnan);
} else {
ppc_store_fpresult_flt(reg_d, ppc_dblresult64_d);
}
ppc_store_fpresult_int(reg_d, ppc_result64_d);
snan_single_check(reg_d);
if (rec)
ppc_update_cr1();

5
cpu/ppc/ppcmacros.h
View File

@ -150,9 +150,12 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
int reg_d = (opcode >> 21) & 31; \
int reg_b = (opcode >> 11) & 31;
#define GET_FPR(reg) \
#define GET_FPR(reg) \
ppc_state.fpr[(reg)].dbl64_r
#define FPR_INT(reg)\
ppc_state.fpr[reg].int64_r
#define ppc_grab_regsfpdiab(opcode) \
int reg_d = (opcode >> 21) & 31; \
int reg_a = (opcode >> 16) & 31; \