srams: 90 degrees rotation in lieu

[oharboe]

This moved WNS for cts from -2685 to -2852, which is so small a difference as to be inconclusive as to whether it is better or worse, but it is certainly not dramatically better.

It does not look like pin placement has any effect on macro placement, possibly only orentation?

With this change:

Before:

This is global routing congestion-20.rpt

Before this change, in congestion-20.rpt there were more problems with routing around the macros, but less in the middle:

Stage: cts

Variant	base	1
Description	Flattend, timing driven placement	Hierarchical, branch predictors as macros
Buffer	118587	246303
Clock buffer	12179	20180
Clock inverter	3726	6144
Inverter	70385	130946
Macro	72	42
Multi-Input combinational cell	740179	1263033
Sequential cell	118443	214014
Tie cell	60	1520
Timing Repair Buffer	69084	80716
Total	1132715	1962898
slack	-2852.557373	-5589.279297
tns	-95356312.0	-445220320.0
GPL_TIMING_DRIVEN	1
HOLD_SLACK_MARGIN		-900
MACRO_PLACEMENT_TCL	$(location write_macro_placement)
MAX_ROUTING_LAYER		M9
PDN_TCL		$(location :pdn.tcl)
SKIP_CTS_REPAIR_TIMING	0
SKIP_LAST_GASP	0
SYNTH_HIERARCHICAL	0
dissolve
previous_stage
2_1_floorplan.log	140	556
2_2_floorplan_io.log	21	35
2_3_floorplan_macro.log	25	1060
2_4_floorplan_tapcell.log	21	34
2_5_floorplan_pdn.log	537	145
3_1_place_gp_skip_io.log	1367	928
3_2_place_iop.log	26	39
3_3_place_gp.log	9216	3122
3_4_place_resized.log	326	576
3_5_place_dp.log	1387	2485
4_1_cts.log	24143	507

Base configuration variables

Variable	Value
CORE_AREA	2 2 1498 1498
DIE_AREA	0 0 1500 1500
FILL_CELLS
GPL_ROUTABILITY_DRIVEN	1
GPL_TIMING_DRIVEN	0
HOLD_SLACK_MARGIN	-200
IO_CONSTRAINTS	$(location :io-boomtile)
MACRO_PLACE_HALO	19 19
MAX_ROUTING_LAYER	M7
MIN_ROUTING_LAYER	M2
PDN_TCL	$(PLATFORM_DIR)/openRoad/pdn/BLOCKS_grid_strategy.tcl
PLACE_DENSITY	0.24
PLACE_PINS_ARGS	-annealing
ROUTING_LAYER_ADJUSTMENT	0.45
SDC_FILE	$(location :constraints-boomtile)
SETUP_SLACK_MARGIN	-1300
SKIP_CTS_REPAIR_TIMING	1
SKIP_INCREMENTAL_REPAIR	1
SKIP_LAST_GASP	1
SKIP_REPORT_METRICS	1
SYNTH_HIERARCHICAL	1
TAPCELL_TCL
TNS_END_PERCENT	0