From e70bcb8e1838f5c88cdea19967835f112a8f1bd8 Mon Sep 17 00:00:00 2001
From: David Li
Date: Sun, 3 Jan 2016 13:06:42 -0700
Subject: Test writing with cache miss
---
src/lib.rs | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/src/lib.rs b/src/lib.rs
index e7d8db9..66afe2a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -88,19 +88,24 @@ mod tests {
assert_eq!(memory.read_byte(0x12), Ok(0x23));
assert_eq!(memory.read_byte(0x13), Ok(0x01));
- let stall = memory.latency();
+ let stall = Err(MemoryError::CacheMiss {
+ stall_cycles: memory.latency(),
+ });
+ let write_stall = Err(MemoryError::CacheMiss {
+ stall_cycles: memory.latency(),
+ });
+
let memory_box = Box::new(memory) as Box;
let memory_ref = Rc::new(RefCell::new(memory_box));
let mut dm_cache = DirectMappedCache::new(4, 4, memory_ref.clone());
- assert_eq!(dm_cache.read_word(0x10), Err(MemoryError::CacheMiss {
- stall_cycles: stall,
- }));
+ assert_eq!(dm_cache.read_word(0x10), stall);
for _ in 0..100 {
dm_cache.step();
}
+ assert_eq!(dm_cache.write_word(0x20, 0x123), write_stall);
assert_eq!(dm_cache.read_word(0x10), Ok(0x01234567));
assert_eq!(dm_cache.read_word(0x14), Ok(0xDEADBEEF));
assert_eq!(dm_cache.read_word(0x18), Ok(0xF0));
@@ -112,5 +117,17 @@ mod tests {
assert_eq!(dm_cache.write_word(0x18, 0xBEEFBEEF), Ok(()));
assert_eq!(dm_cache.read_word(0x18), Ok(0xBEEFBEEF));
assert_eq!(memory_ref.borrow_mut().read_word(0x18), Ok(0xBEEFBEEF));
+
+ for _ in 0..100 {
+ dm_cache.step();
+ }
+
+ assert_eq!(dm_cache.write_word(0x20, 0x123), Ok(()));
+ assert_eq!(memory_ref.borrow_mut().read_word(0x20), Ok(0x123));
+ // Should not have been evicted
+ assert_eq!(dm_cache.read_word(0x10), Ok(0x01234567));
+ assert_eq!(dm_cache.read_word(0x14), Ok(0xDEADBEEF));
+ assert_eq!(dm_cache.read_word(0x18), Ok(0xBEEFBEEF));
+ assert_eq!(dm_cache.read_word(0x1C), Ok(0xF0));
}
}
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