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ppcopcodes: avoid TLB flushes for noop SR changes

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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
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18
cpu/ppc/ppcopcodes.cpp
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@ -728,8 +728,10 @@ void dppc_interpreter::ppc_mtsr() {
} }
int reg_s = (ppc_cur_instruction >> 21) & 0x1F; int reg_s = (ppc_cur_instruction >> 21) & 0x1F;
uint32_t grab_sr = (ppc_cur_instruction >> 16) & 0x0F; uint32_t grab_sr = (ppc_cur_instruction >> 16) & 0x0F;
ppc_state.sr[grab_sr] = ppc_state.gpr[reg_s]; if (ppc_state.sr[grab_sr] != ppc_state.gpr[reg_s]) {
mmu_pat_ctx_changed(); ppc_state.sr[grab_sr] = ppc_state.gpr[reg_s];
mmu_pat_ctx_changed();
}
} }
void dppc_interpreter::ppc_mtsrin() { void dppc_interpreter::ppc_mtsrin() {
@ -741,8 +743,10 @@ void dppc_interpreter::ppc_mtsrin() {
} }
ppc_grab_regssb(ppc_cur_instruction); ppc_grab_regssb(ppc_cur_instruction);
uint32_t grab_sr = ppc_result_b >> 28; uint32_t grab_sr = ppc_result_b >> 28;
ppc_state.sr[grab_sr] = ppc_result_d; if (ppc_state.sr[grab_sr] != ppc_result_d) {
mmu_pat_ctx_changed(); ppc_state.sr[grab_sr] = ppc_result_d;
mmu_pat_ctx_changed();
}
} }
void dppc_interpreter::ppc_mfsr() { void dppc_interpreter::ppc_mfsr() {
@ -969,8 +973,10 @@ void dppc_interpreter::ppc_mtspr() {
ppc_state.spr[ref_spr] = val & 0xe000ff7f; ppc_state.spr[ref_spr] = val & 0xe000ff7f;
break; break;
case SPR::SDR1: case SPR::SDR1:
ppc_state.spr[ref_spr] = val; if (ppc_state.spr[ref_spr] != val) {
mmu_pat_ctx_changed(); // adapt to SDR1 changes ppc_state.spr[ref_spr] = val;
mmu_pat_ctx_changed(); // adapt to SDR1 changes
}
break; break;
case SPR::RTCL_S: case SPR::RTCL_S:
calc_rtcl_value(); calc_rtcl_value();