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体验新版 GitCode,发现更多精彩内容 >>
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7687dc59
编写于
8月 01, 2020
作者:
Z
zhanglinjuan
浏览文件
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电子邮件补丁
差异文件
ifu: fix combinational loop in history
上级
59d92720
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
6 addition
and
5 deletion
+6
-5
src/main/scala/xiangshan/frontend/IFU.scala
src/main/scala/xiangshan/frontend/IFU.scala
+6
-5
未找到文件。
src/main/scala/xiangshan/frontend/IFU.scala
浏览文件 @
7687dc59
...
...
@@ -47,7 +47,8 @@ class IFU extends XSModule with HasIFUConst
val
if2_ready
=
WireInit
(
false
.
B
)
val
if1_fire
=
if1_valid
&&
(
if2_ready
||
if1_flush
)
&&
io
.
icacheReq
.
ready
val
extHist
=
VecInit
(
Fill
(
ExtHistoryLength
,
RegInit
(
0.
U
(
1.
W
))))
// val extHist = VecInit(Fill(ExtHistoryLength, RegInit(0.U(1.W))))
val
extHist
=
RegInit
(
VecInit
(
Seq
.
fill
(
ExtHistoryLength
)(
0.
U
(
1.
W
))))
val
headPtr
=
RegInit
(
0.
U
(
log2Up
(
ExtHistoryLength
).
W
))
val
shiftPtr
=
WireInit
(
false
.
B
)
val
newPtr
=
Wire
(
UInt
(
log2Up
(
ExtHistoryLength
).
W
))
...
...
@@ -145,14 +146,14 @@ class IFU extends XSModule with HasIFUConst
shiftPtr
:=
true
.
B
newPtr
:=
Mux
(
if3_bp
.
taken
||
if3_bp
.
hasNotTakenBrs
,
if3_histPtr
-
1.
U
,
if3_histPtr
)
hist
(
0
)
:=
Mux
(
if3_bp
.
taken
||
if3_bp
.
hasNotTakenBrs
,
if3_bp
.
taken
.
asUInt
,
extHist
(
if3_histPtr
))
extHist
(
newPtr
)
:=
Mux
(
if3_bp
.
taken
||
if3_bp
.
hasNotTakenBrs
,
if3_bp
.
taken
.
asUInt
,
extHist
(
new
Ptr
))
extHist
(
newPtr
)
:=
Mux
(
if3_bp
.
taken
||
if3_bp
.
hasNotTakenBrs
,
if3_bp
.
taken
.
asUInt
,
extHist
(
if3_hist
Ptr
))
}.
elsewhen
(
if3_bp
.
saveHalfRVI
)
{
if3_redirect
:=
true
.
B
if1_npc
:=
snpc
(
if3_pc
)
shiftPtr
:=
true
.
B
newPtr
:=
Mux
(
if3_bp
.
hasNotTakenBrs
,
if3_histPtr
-
1.
U
,
if3_histPtr
)
hist
(
0
)
:=
Mux
(
if3_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
if3_histPtr
))
extHist
(
newPtr
)
:=
Mux
(
if3_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
new
Ptr
))
extHist
(
newPtr
)
:=
Mux
(
if3_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
if3_hist
Ptr
))
}.
otherwise
{
if3_redirect
:=
false
.
B
}
...
...
@@ -181,7 +182,7 @@ class IFU extends XSModule with HasIFUConst
shiftPtr
:=
true
.
B
newPtr
:=
Mux
(
if4_bp
.
taken
||
if4_bp
.
hasNotTakenBrs
,
if4_histPtr
-
1.
U
,
if4_histPtr
)
hist
(
0
)
:=
Mux
(
if4_bp
.
taken
||
if4_bp
.
hasNotTakenBrs
,
if4_bp
.
taken
.
asUInt
,
extHist
(
if4_histPtr
))
extHist
(
newPtr
)
:=
Mux
(
if4_bp
.
taken
||
if4_bp
.
hasNotTakenBrs
,
if4_bp
.
taken
.
asUInt
,
extHist
(
new
Ptr
))
extHist
(
newPtr
)
:=
Mux
(
if4_bp
.
taken
||
if4_bp
.
hasNotTakenBrs
,
if4_bp
.
taken
.
asUInt
,
extHist
(
if4_hist
Ptr
))
}.
otherwise
{
if4_redirect
:=
true
.
B
...
...
@@ -199,7 +200,7 @@ class IFU extends XSModule with HasIFUConst
shiftPtr
:=
true
.
B
newPtr
:=
Mux
(
if4_bp
.
hasNotTakenBrs
,
if4_histPtr
-
1.
U
,
if4_histPtr
)
hist
(
0
)
:=
Mux
(
if4_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
if4_histPtr
))
extHist
(
newPtr
)
:=
Mux
(
if4_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
new
Ptr
))
extHist
(
newPtr
)
:=
Mux
(
if4_bp
.
hasNotTakenBrs
,
0.
U
,
extHist
(
if4_hist
Ptr
))
}
}.
otherwise
{
if4_redirect
:=
false
.
B
...
...
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