power(SC): dynamically close SC

[Lawrence-ID]

• SC is open by default and can be dynamically closed by setting DynCloseSC to true.

• SC closure is controlled by the value of scCloseConfCounter.
  When scCloseConfCounter >= 0, SC is closed. When it is less than 0, SC is enabled.

• To avoid affecting timing, the update of the scCloseConfCounter is placed on the next
  clock cycle after SC update

• The counter is adjusted based on the list for Agree and Disagree scenarios.

• Agree Scenarios ( When SC opened ):

• When TAGE and SC pred both taken (√) and the actual condition is also taken (√),
  SC performs "Negative action No.3" and scCloseConf will be increased by
  +x1(SCCloseConfIncWhenSCAgreeAndCorrect).
• When TAGE and SC pred both taken (√) but the actual condition is not taken (×),
  SC performs "Negative action No.2" and scCloseConf will be increased by
  +x2(SCCloseConfIncWhenSCAgreeButWrong).
• When neither TAGE nor SC pred taken (×) but the actual condition is taken (√),
  SC performs "Negative action No.2" and scCloseConf will be increased by
  +x2(SCCloseConfIncWhenSCAgreeButWrong).
• When neither TAGE nor SC pred taken (×) and the actual condition is not taken (×),
  SC performs "Negative action No.3" and scCloseConf will be increased by
  +x1(SCCloseConfIncWhenSCAgreeAndCorrect).

• Disagree Scenarios ( When SC opened ):

• When TAGE pred taken (√) and SC is not taken (×), but the actual condition is taken (√),
  SC performs "Negative action No.1" and scCloseConf will be increased by
  +x3(SCCloseConfIncWhenSCDisagreeButTAGECorrect).
• When TAGE pred taken (√) and SC is not taken (×), and the actual condition is not taken (×),
  SC performs "Positive action No.1" and scCloseConf will be decreased by
  -y(SCCloseConfDecWhenSCDisagreeAndSCCorrect).
• When TAGE pred not taken (×) but SC is taken (√), and the actual condition is taken (√),
  SC performs "Positive action No.1" and scCloseConf will be decreased by
  -y(SCCloseConfDecWhenSCDisagreeAndSCCorrect).
• When TAGE pred not taken (×) but SC is taken (√), and the actual condition is not taken (×),
  SC performs "Negative action No.1" and scCloseConf will be increased by
  +x3(SCCloseConfIncWhenSCDisagreeButTAGECorrect).

• When SC Closed:

• If TAGE pred wrong, SC should be opened, so scCloseConf will be
  increased by SCCloseConfIncWhenSCClosedAndTAGEWrong
• If TAGE pred correct, SC can be closed, so scCloseConf will be
  decreased by SCCloseConfDecWhenSCClosedAndTAGEWrong

[XiangShanRobot]

[Generated by IPC robot]
commit: e430d9a

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
e430d9a	1.810	0.442	2.645	1.225	2.151	2.148	2.363	0.941	1.406	1.939	3.098	2.554	2.271	3.311

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
25a80bc	1.819	0.442	2.636	1.226	2.143	2.140	2.361	0.939	1.408	1.984	3.113	2.565	2.271	3.303
bcdee82		0.442	2.639	1.230		2.145	2.361	0.939	1.401	1.931	3.107	2.559		3.308
b7a6349	1.823	0.442	2.640	1.233	2.159	2.145	2.361	0.939	1.401	1.931	3.107	2.559	2.272	3.308
e9cac66	1.823	0.442	2.639	1.220	2.159	2.145	2.361	0.939	1.401	1.931	3.107	2.559	2.272	3.308
0b4afd3	1.823	0.442	2.639	1.225	2.159	2.145	2.361	0.939	1.405	1.931	3.107	2.559	2.272	3.308
0836852	1.823	0.442	2.639	1.237	2.159	2.145	2.361	0.939	1.405	1.931	3.107	2.559	2.272	3.308
5bd65c5	1.823	0.442	2.639	1.223	2.159	2.145	2.361	0.939	1.401	1.931	3.107	2.559	2.272	3.308
28bf033	1.823	0.442	2.639	1.223	2.159	2.145	2.361	0.939	1.407	1.931	3.107	2.556	2.272	3.308
63e777d	1.823	0.442	2.640	1.222	2.159	2.145	2.361	0.939	1.407	1.931	3.107	2.556	2.272	3.308
37f33e1	1.823	0.442	2.639	1.230	2.159	2.145	2.361	0.939	1.400	1.931	3.107	2.556	2.272	3.308

[XiangShanRobot]

[Generated by IPC robot]
commit: 71b1dcf

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
71b1dcf	1.819	0.442	2.636	1.229	2.143	2.140	2.361	0.939	1.401	1.984	3.113	2.565	2.271	3.303

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	hmmer-Vector	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
ebd53cd			2.636	1.223	2.143	1.501	2.140	2.361	0.939	1.401	1.984	3.113	2.565		3.303
8026b5a	1.819	0.442	2.636	1.234	2.143	1.501	2.140	2.361	0.939	1.405	1.984	3.113	2.565	2.271	3.303
a57c953				1.223	2.143	1.501	2.140		0.939		1.984	3.113			3.303
517c737	1.819	0.442	2.636	1.232	2.143	1.501	2.140	2.361	0.939	1.401	1.984	3.113	2.565	2.271	3.303
800b4e0	1.819	0.442	2.636	1.240	2.143		2.140	2.361	0.939	1.405	1.984	3.113	2.565	2.271	3.303
e836c77	1.819	0.442	2.636	1.230	2.143		2.140	2.361	0.939	1.408	1.984	3.113	2.565	2.271	3.303
25a80bc	1.819	0.442	2.636	1.226	2.143		2.140	2.361	0.939	1.408	1.984	3.113	2.565	2.271	3.303
bcdee82	1.823	0.442	2.639	1.230	2.159		2.145	2.361	0.939	1.401	1.931	3.107	2.559	2.272	3.308
b7a6349	1.823	0.442	2.640	1.233	2.159		2.145	2.361	0.939	1.401	1.931	3.107	2.559	2.272	3.308

[eastonman]

LGTM