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ppcopcodes: Cleanup ppc_changecrf0.

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- Use one assignment to set ppc_state.cr.
- Use enums for CR and XER bits.
- Use < to check sign bit.
This commit is contained in:
joevt 2024-04-08 22:18:54 -07:00 committed by dingusdev
parent 1e50d88183
commit 0273867c49
1 changed files with 11 additions and 14 deletions
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25
cpu/ppc/ppcopcodes.cpp
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@ -33,20 +33,17 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
// Affects CR Field 0 - For integer operations
void ppc_changecrf0(uint32_t set_result) {
ppc_state.cr &= 0x0FFFFFFFUL;
if (set_result == 0) {
ppc_state.cr |= 0x20000000UL;
} else {
if (set_result & 0x80000000) {
ppc_state.cr |= 0x80000000UL;
} else {
ppc_state.cr |= 0x40000000UL;
}
}
/* copy XER[SO] into CR0[SO]. */
ppc_state.cr |= (ppc_state.spr[SPR::XER] >> 3) & 0x10000000UL;
ppc_state.cr =
(ppc_state.cr & 0x0FFFFFFFU) // clear CR0
| (
(set_result == 0) ?
CRx_bit::CR_EQ
: (int32_t(set_result) < 0) ?
CRx_bit::CR_LT
:
CRx_bit::CR_GT
)
| ((ppc_state.spr[SPR::XER] & XER::SO) >> 3); // copy XER[SO] into CR0[SO].
}
// Affects the XER register's Carry Bit