From 57bae864f810899ae052755155702232a03f3655 Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Wed, 15 Sep 2021 21:53:08 +0200
Subject: [PATCH] Add memcpy perf test

---
 tests/test.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/tests/test.c b/tests/test.c
index 2b9ded3..2dac77d 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -11,6 +11,29 @@
 #include "synchro.h"
 #include "time.h"
 
+void testMemcpyPerf()
+{
+    struct test_struct {
+        char data[4096];
+    };
+    // instantiate 2 structs. for our purposes, we don't care what data is in
+    // there. set them to `volatile` so the compiler won't optimize away what we
+    // do with them
+    volatile struct test_struct dest, source;
+
+    printf("Test Memcpy perf\n");
+    // run through powers-of-two memcpy's, printing stats for each test
+    for (size_t len = 1; len <= sizeof(dest); len <<= 1) {
+        uint32_t start = read_cycle_counter(); // << Start count
+        memcpy((void *)&dest, (void *)&source, len);
+        uint32_t stop = read_cycle_counter(); // << Stop count
+
+        // print out the cycles consumed
+        printf("len = %d, %d %d cyccnt = %d, cycles/byte = %d\n", (uint32_t)len, stop, start,
+               stop - start, (stop - start) / len);
+    }
+}
+
 void testPhymem(void)
 {
     printf("Testing memory PHY\n");
@@ -47,7 +70,8 @@ void testPhymem(void)
     assert(freePageStatFree == freePageStatBegin);
     assert(usedPageStatFree == usedPageStatBegin);
 
-    assertmsg((page = (struct phyMemDesc *)allocPhyPage(1)) != NULL, "Cannot allocate memory\n");
+    assertmsg((page = (struct phyMemDesc *)allocPhyPage(1)) != NULL,
+              "Cannot allocate memory\n");
     unrefPhyPage((ulong)page);
 }
 
@@ -135,7 +159,8 @@ static void testPaging(void)
     }
     printf("%d pages freed\n", freeCount);
 
-    assertmsg((page = (struct phyMemDesc *)allocPhyPage(1)) != NULL, "Cannot allocate memory\n");
+    assertmsg((page = (struct phyMemDesc *)allocPhyPage(1)) != NULL,
+              "Cannot allocate memory\n");
     unrefPhyPage((ulong)page);
 }
 
@@ -313,6 +338,7 @@ void testKthread()
 
 void run_test(void)
 {
+    testMemcpyPerf();
     {
         int test             = 1000;
         long long int test64 = 0x100000000;