Macintosh-Tools/dingusppc
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Optimize register initialization

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Courtesy of joevt, adapted to fit the C++ standard
This commit is contained in:
dingusdev 2024-03-26 18:52:56 -07:00
parent b15d3be88a
commit a09f2093b5
1 changed files with 3 additions and 36 deletions
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39
cpu/ppc/ppcexec.cpp
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@ -799,23 +799,15 @@ void initialize_ppc_opcode_tables() {
} }
} }
void ppc_fpu_init() {
// zero all FPRs as prescribed for MPC601
// For later PPC CPUs, GPR content is undefined
for (int i = 0; i < 32; i++) {
ppc_state.fpr[i].int64_r = 0;
}
ppc_state.fpscr = 0;
set_host_rounding_mode(0);
}
void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, uint64_t tb_freq) void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, uint64_t tb_freq)
{ {
int i; int i;
mem_ctrl_instance = mem_ctrl; mem_ctrl_instance = mem_ctrl;
std::memset(&ppc_state, 0, sizeof(ppc_state));
set_host_rounding_mode(0);
ppc_state.spr[SPR::PVR] = cpu_version; ppc_state.spr[SPR::PVR] = cpu_version;
is_601 = (cpu_version >> 16) == 1; is_601 = (cpu_version >> 16) == 1;
@ -862,31 +854,6 @@ void ppc_cpu_init(MemCtrlBase* mem_ctrl, uint32_t cpu_version, uint64_t tb_freq)
timebase_counter = 0; timebase_counter = 0;
dec_wr_value = 0; dec_wr_value = 0;
/* zero all GPRs as prescribed for MPC601 */
/* For later PPC CPUs, GPR content is undefined */
for (i = 0; i < 32; i++) {
ppc_state.gpr[i] = 0;
}
/* zero all segment registers as prescribed for MPC601 */
/* For later PPC CPUs, SR content is undefined */
for (i = 0; i < 16; i++) {
ppc_state.sr[i] = 0;
}
ppc_state.cr = 0;
ppc_fpu_init();
ppc_state.pc = 0;
ppc_state.tbr[0] = 0;
ppc_state.tbr[1] = 0;
/* zero all SPRs */
for (i = 0; i < 1024; i++) {
ppc_state.spr[i] = 0;
}
if (is_601) { if (is_601) {
/* MPC601 sets MSR[ME] bit during hard reset / Power-On */ /* MPC601 sets MSR[ME] bit during hard reset / Power-On */