From 2178bb4acaf5fb7ba8d8adfc404ef854a1800823 Mon Sep 17 00:00:00 2001
From: Folkert van Heusden <mail@vanheusden.com>
Date: Tue, 1 Apr 2025 07:35:32 +0200
Subject: [PATCH] benchmark

---
 main.cpp | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/main.cpp b/main.cpp
index 7ed75b7..338543b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -371,10 +371,12 @@ int main(int argc, char *argv[])
 
 	std::string  deserialize;
 
+	bool         benchmark = false;
+
 	std::optional<std::string> dc11_device;
 
 	int  opt          = -1;
-	while((opt = getopt(argc, argv, "hD:MT:Br:R:p:ndtL:bl:s:Q:N:J:XS:P1:")) != -1)
+	while((opt = getopt(argc, argv, "hqD:MT:Br:R:p:ndtL:bl:s:Q:N:J:XS:P1:")) != -1)
 	{
 		switch(opt) {
 			case 'h':
@@ -405,6 +407,10 @@ int main(int argc, char *argv[])
 				test = optarg;
 				break;
 
+			case 'q':
+				benchmark = true;
+				break;
+
 			case 's': {
 					char *c = strchr(optarg, ',');
 					if (!c)
@@ -669,6 +675,24 @@ int main(int argc, char *argv[])
 		run_bic(cnsl, b, &event, bic_start.value());
 	else if (run_debugger || (bootloader == BL_NONE && test.empty() && tape.empty()))
 		debugger(cnsl, b, &event);
+	else if (benchmark) {
+		// FILL MEMORY
+		memory *m = b->getRAM();
+		for(uint32_t i=0; i<m->get_memory_size(); i++)
+			m->write_byte(i, i);
+		// SET MMU TO ENABLED
+		b->getMMU()->setMMR0_as_is(1);  // enable MMU
+		// run for a second
+		b->getCpu()->emulation_start();  // for statistics
+		uint64_t start = get_us();
+		do {
+			b->getCpu()->step();
+		}
+		while(get_us() - start <= 2500000);
+
+		auto stats = b->getCpu()->get_mips_rel_speed({ }, { });
+		cnsl->put_string_lf(format("MIPS: %.2f, relative speed: %.2f%%, instructions executed: %" PRIu64 " in %.2f seconds", std::get<0>(stats), std::get<1>(stats), std::get<2>(stats), std::get<3>(stats) / 1000000.));
+	}
 	else {
 		b->getCpu()->emulation_start();  // for statistics