faster if we don't syncregs each time

mipsevm/compare_unievm_test.go

@@ -51,6 +51,7 @@ func TestCompareUnicornEvm(t *testing.T) {
 	uniram := make(map[uint32](uint32))
 	ministart := time.Now()
 	go RunUnicorn(fn, uniram, false, func(step int, mu uc.Unicorn, ram map[uint32](uint32)) {
+		SyncRegs(mu, ram)
 		cuni <- RegSerialize(ram)
 		done.Lock()
 		done.Unlock()

mipsevm/main.go

@@ -23,6 +23,7 @@ func main() {
 	lastStep := 0
 	mu := GetHookedUnicorn(root, ram, func(step int, mu uc.Unicorn, ram map[uint32](uint32)) {
 		if step%1000000 == 0 {
+			SyncRegs(mu, ram)
 			WriteCheckpoint(ram, root, step)
 		}
 		lastStep = step

mipsevm/unicorn.go

@@ -149,7 +149,6 @@ func GetHookedUnicorn(root string, ram map[uint32](uint32), callback func(int, u
 		}, 0, 0x80000000)
 
 		mu.HookAdd(uc.HOOK_CODE, func(mu uc.Unicorn, addr uint64, size uint32) {
-			SyncRegs(mu, ram)
 			callback(steps, mu, ram)
 			steps += 1
 		}, 0, 0x80000000)