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ppcopcodes: Cleanup branch instructions.

This commit is contained in:
joevt 2024-03-07 02:41:23 -08:00 committed by dingusdev
parent 67bd47f11f
commit e1d43b8eb2
1 changed files with 8 additions and 16 deletions
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24
cpu/ppc/ppcopcodes.cpp
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@ -1116,35 +1116,27 @@ void dppc_interpreter::ppc_extsh() {
// Branching Instructions
// The last two bytes of the instruction are used for determining how the branch happens.
// The middle 24 bytes are the 24-bit address to use for branching to.
void dppc_interpreter::ppc_b() {
uint32_t quick_test = (ppc_cur_instruction & 0x03FFFFFCUL);
int32_t adr_li = (quick_test < 0x2000000UL) ? quick_test : (0xFC000000UL + quick_test);
int32_t adr_li = int32_t(ppc_cur_instruction << 6) >> 6;
ppc_next_instruction_address = uint32_t(ppc_state.pc + adr_li);
exec_flags = EXEF_BRANCH;
}
void dppc_interpreter::ppc_bl() {
uint32_t quick_test = (ppc_cur_instruction & 0x03FFFFFCUL);
int32_t adr_li = (quick_test < 0x2000000UL) ? quick_test : (0xFC000000UL + quick_test);
int32_t adr_li = int32_t((ppc_cur_instruction & ~3UL) << 6) >> 6;
ppc_next_instruction_address = uint32_t(ppc_state.pc + adr_li);
ppc_state.spr[SPR::LR] = uint32_t(ppc_state.pc + 4);
exec_flags = EXEF_BRANCH;
}
void dppc_interpreter::ppc_ba() {
uint32_t quick_test = (ppc_cur_instruction & 0x03FFFFFCUL);
int32_t adr_li = (quick_test < 0x2000000UL) ? quick_test : (0xFC000000UL + quick_test);
int32_t adr_li = int32_t((ppc_cur_instruction & ~3UL) << 6) >> 6;
ppc_next_instruction_address = adr_li;
exec_flags = EXEF_BRANCH;
}
void dppc_interpreter::ppc_bla() {
uint32_t quick_test = (ppc_cur_instruction & 0x03FFFFFCUL);
int32_t adr_li = (quick_test < 0x2000000UL) ? quick_test : (0xFC000000UL + quick_test);
int32_t adr_li = int32_t((ppc_cur_instruction & ~3UL) << 6) >> 6;
ppc_next_instruction_address = adr_li;
ppc_state.spr[SPR::LR] = uint32_t(ppc_state.pc + 4);
exec_flags = EXEF_BRANCH;
@ -1155,7 +1147,7 @@ void dppc_interpreter::ppc_bc() {
uint32_t cnd_ok;
uint32_t br_bo = (ppc_cur_instruction >> 21) & 31;
uint32_t br_bi = (ppc_cur_instruction >> 16) & 31;
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & 0xFFFCUL));
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & ~3UL));
if (!(br_bo & 0x04)) {
(ppc_state.spr[SPR::CTR])--; /* decrement CTR */
@ -1174,7 +1166,7 @@ void dppc_interpreter::ppc_bca() {
uint32_t cnd_ok;
uint32_t br_bo = (ppc_cur_instruction >> 21) & 31;
uint32_t br_bi = (ppc_cur_instruction >> 16) & 31;
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & 0xFFFCUL));
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & ~3UL));
if (!(br_bo & 0x04)) {
(ppc_state.spr[SPR::CTR])--; /* decrement CTR */
@ -1193,7 +1185,7 @@ void dppc_interpreter::ppc_bcl() {
uint32_t cnd_ok;
uint32_t br_bo = (ppc_cur_instruction >> 21) & 31;
uint32_t br_bi = (ppc_cur_instruction >> 16) & 31;
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & 0xFFFCUL));
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & ~3UL));
if (!(br_bo & 0x04)) {
(ppc_state.spr[SPR::CTR])--; /* decrement CTR */
@ -1213,7 +1205,7 @@ void dppc_interpreter::ppc_bcla() {
uint32_t cnd_ok;
uint32_t br_bo = (ppc_cur_instruction >> 21) & 31;
uint32_t br_bi = (ppc_cur_instruction >> 16) & 31;
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & 0xFFFCUL));
int32_t br_bd = int32_t(int16_t(ppc_cur_instruction & ~3UL));
if (!(br_bo & 0x04)) {
(ppc_state.spr[SPR::CTR])--; /* decrement CTR */