Macintosh-Tools/dingusppc
1
0
Fork 0
mirror of https://github.com/dingusdev/dingusppc.git synced 2025-01-07 23:31:46 +00:00
Code Issues Projects Releases Wiki Activity

ppcopcodes: avoid TLB flushes for noop SR changes

Browse Source 
They happen surprisingly often, and flushing the TLB is expensive
because we need to walk over all entries.

Takes booting 10.2 on a Beige G3 from binary start to "Welcome to Macintosh"
from 58s to 38s on my machine.
This commit is contained in:
Mihai Parparita 2024-07-28 13:22:43 -07:00
parent 9b49603c72
commit 31d7b056af
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
cpu/ppc/ppcopcodes.cpp
View File

@ -728,8 +728,10 @@ void dppc_interpreter::ppc_mtsr() {
}
int reg_s = (ppc_cur_instruction >> 21) & 0x1F;
uint32_t grab_sr = (ppc_cur_instruction >> 16) & 0x0F;
ppc_state.sr[grab_sr] = ppc_state.gpr[reg_s];
mmu_pat_ctx_changed();
if (ppc_state.sr[grab_sr] != ppc_state.gpr[reg_s]) {
ppc_state.sr[grab_sr] = ppc_state.gpr[reg_s];
mmu_pat_ctx_changed();
}
}
void dppc_interpreter::ppc_mtsrin() {
@ -741,8 +743,10 @@ void dppc_interpreter::ppc_mtsrin() {
}
ppc_grab_regssb(ppc_cur_instruction);
uint32_t grab_sr = ppc_result_b >> 28;
ppc_state.sr[grab_sr] = ppc_result_d;
mmu_pat_ctx_changed();
if (ppc_state.sr[grab_sr] != ppc_result_d) {
ppc_state.sr[grab_sr] = ppc_result_d;
mmu_pat_ctx_changed();
}
}
void dppc_interpreter::ppc_mfsr() {
@ -969,8 +973,10 @@ void dppc_interpreter::ppc_mtspr() {
ppc_state.spr[ref_spr] = val & 0xe000ff7f;
break;
case SPR::SDR1:
ppc_state.spr[ref_spr] = val;
mmu_pat_ctx_changed(); // adapt to SDR1 changes
if (ppc_state.spr[ref_spr] != val) {
ppc_state.spr[ref_spr] = val;
mmu_pat_ctx_changed(); // adapt to SDR1 changes
}
break;
case SPR::RTCL_S:
calc_rtcl_value();