Hanhwi Jang has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/67231?usp=email )
Change subject: cpu-o3: Resolve the skid buffer overflow issue at decode
stage
......................................................................
cpu-o3: Resolve the skid buffer overflow issue at decode stage
When decode width is larger than fetch width, the skid buffer
overflow happens at decode stage. The decode stage assumes
that fetch stage sends instructions as many as the fetch width,
but it sends them at decode width rate.
This patch makes the decode stage set its skid buffer size
according to the decode width.
Change-Id: I90ee43d16c59a4c9305c77bbfad7e4cdb2b9cffa
---
M src/cpu/o3/decode.cc
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/src/cpu/o3/decode.cc b/src/cpu/o3/decode.cc
index 9555e32..ac728a2 100644
--- a/src/cpu/o3/decode.cc
+++ b/src/cpu/o3/decode.cc
@@ -77,7 +77,7 @@
decodeWidth, static_cast<int>(MaxWidth));
// @todo: Make into a parameter
- skidBufferMax = (fetchToDecodeDelay + 1) * params.fetchWidth;
+ skidBufferMax = (fetchToDecodeDelay + 1) * params.decodeWidth;
for (int tid = 0; tid < MaxThreads; tid++) {
stalls[tid] = {false};
decodeStatus[tid] = Idle;
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I90ee43d16c59a4c9305c77bbfad7e4cdb2b9cffa
Gerrit-Change-Number: 67231
Gerrit-PatchSet: 1
Gerrit-Owner: Hanhwi Jang <jang.han...@gmail.com>
Gerrit-MessageType: newchange
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