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inorder: add a fetch buffer to fetch unit

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Give fetch unit it's own parameterizable fetch buffer to read from. Very inefficient
(architecturally and in simulation) to continually fetch at the granularity of the
wordsize. As expected, the number of fetch memory requests drops dramatically
This commit is contained in:
Korey Sewell
2011-02-04 00:08:22 -05:00
parent 56ce8acd41
commit 68d962f8af
5 changed files with 371 additions and 137 deletions
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5
src/cpu/inorder/InOrderCPU.py
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@@ -48,6 +48,9 @@ class InOrderCPU(BaseCPU):
dcache_port = Port("Data Port")
_cached_ports = ['icache_port', 'dcache_port']
fetchBuffSize = Param.Unsigned(4, "Fetch Buffer Size (Number of Cache Blocks Stored)")
memBlockSize = Param.Unsigned(64, "Memory Block Size")
predType = Param.String("tournament", "Branch predictor type ('local', 'tournament')")
localPredictorSize = Param.Unsigned(2048, "Size of local predictor")
localCtrBits = Param.Unsigned(2, "Bits per counter")
@@ -69,8 +72,6 @@ class InOrderCPU(BaseCPU):
functionTraceStart = Param.Tick(0, "Cycle to start function trace")
stageTracing = Param.Bool(False, "Enable tracing of each stage in CPU")
memBlockSize = Param.Unsigned(64, "Memory Block Size")
multLatency = Param.Unsigned(1, "Latency for Multiply Operations")
multRepeatRate = Param.Unsigned(1, "Repeat Rate for Multiply Operations")
div8Latency = Param.Unsigned(1, "Latency for 8-bit Divide Operations")