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Added a new regression to check RC change after remove_buffer
Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>
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‎src/rsz/test/BUILD‎

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@@ -42,7 +42,11 @@ TESTS = [
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"remove_buffers_hier1",
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"remove_buffers1",
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"remove_buffers2",
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"remove_buffers3",
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"remove_buffers4",
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"remove_buffers4_hier",
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"remove_buffers5",
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"remove_buffers5_hier",
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"remove_buffers6",
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"repair_cap1",
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"repair_cap2",
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"repair_cap3",

‎src/rsz/test/CMakeLists.txt‎

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@@ -43,6 +43,7 @@ or_integration_tests(
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remove_buffers4_hier
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remove_buffers5
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remove_buffers5_hier
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remove_buffers6
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repair_cap1
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repair_cap2
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repair_cap3

‎src/rsz/test/remove_buffers6.def‎

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#
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VERSION 5.8 ;
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DIVIDERCHAR "/" ;
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BUSBITCHARS "[]" ;
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DESIGN reg1 ;
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UNITS DISTANCE MICRONS 1000 ;
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DIEAREA ( 0 0 ) ( 40000 1200000 ) ;
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COMPONENTS 5 ;
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- r1 DFF_X1 + PLACED ( 10000 200000 ) N ;
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- u1 BUF_X1 + PLACED ( 10000 300000 ) N ;
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- u2 BUF_X1 + PLACED ( 10000 400000 ) N ;
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- u3 BUF_X1 + PLACED ( 10000 500000 ) N ;
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- u4 BUF_X1 + PLACED ( 10000 600000 ) N ;
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- u5 BUF_X1 + PLACED ( 10000 700000 ) N ;
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- r2 DFF_X1 + PLACED ( 20000 100000 ) N ;
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- r3 DFF_X1 + PLACED ( 20000 200000 ) N ;
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- r4 DFF_X1 + PLACED ( 20000 300000 ) N ;
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- r5 DFF_X1 + PLACED ( 20000 400000 ) N ;
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- r6 DFF_X1 + PLACED ( 20000 500000 ) N ;
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- r7 DFF_X1 + PLACED ( 20000 600000 ) N ;
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- r8 DFF_X1 + PLACED ( 20000 700000 ) N ;
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- r9 DFF_X1 + PLACED ( 20000 800000 ) N ;
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- r10 DFF_X1 + PLACED ( 20000 900000 ) N ;
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- r11 DFF_X1 + PLACED ( 20000 1000000 ) N ;
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- r12 DFF_X1 + PLACED ( 10000 1100000 ) N ;
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END COMPONENTS
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PINS 1 ;
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- clk + NET clk + DIRECTION INPUT + USE SIGNAL + FIXED ( 10000 3333 ) N + LAYER metal2 ( 0 0 ) ( 0 0 ) ;
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END PINS
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SPECIALNETS 2 ;
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- VSS ( * VSS )
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+ USE GROUND ;
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- VDD ( * VDD )
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+ USE POWER ;
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END SPECIALNETS
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NETS 10 ;
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- clk ( PIN clk ) ( r1 CK ) ( r2 CK ) ( r3 CK ) ( r4 CK ) ( r5 CK ) ( r6 CK ) ( r7 CK ) + USE SIGNAL ;
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- r1q ( r1 Q ) ( u1 A ) ( r3 D ) ( r3 D ) ( r4 D ) ( r5 D ) ( r6 D ) ( r7 D ) ( r8 D ) ( r9 D ) ( r10 D ) ( r11 D ) ( r12 D ) + USE SIGNAL ;
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- u1z ( u1 Z ) ( u2 A ) + USE SIGNAL ;
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- u2z ( u2 Z ) ( u3 A ) + USE SIGNAL ;
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- u3z ( u3 Z ) ( u4 A ) + USE SIGNAL ;
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- u4z ( u4 Z ) ( u5 A ) + USE SIGNAL ;
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- u5z ( u5 Z ) ( r2 D ) + USE SIGNAL ;
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END NETS
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END DESIGN

‎src/rsz/test/remove_buffers6.ok‎

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[INFO ODB-0227] LEF file: Nangate45/Nangate45.lef, created 22 layers, 27 vias, 135 library cells
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[INFO ODB-0128] Design: reg1
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[INFO ODB-0130] Created 1 pins.
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[INFO ODB-0131] Created 17 components and 92 component-terminals.
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[INFO ODB-0132] Created 2 special nets and 34 connections.
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[INFO ODB-0133] Created 7 nets and 30 connections.
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[INFO IFP-0001] Added 857 rows of 210 site FreePDK45_38x28_10R_NP_162NW_34O.
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Placement Analysis
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---------------------------------
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total displacement 6.8 u
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average displacement 0.4 u
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max displacement 0.7 u
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original HPWL 2531.1 u
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legalized HPWL 2533.0 u
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delta HPWL 0 %
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worst slack max -0.39
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[INFO RSZ-0026] Removed 1 buffers.
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worst slack max -0.31
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worst slack max -0.31
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worst slack max -0.31

‎src/rsz/test/remove_buffers6.tcl‎

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# Check RC update by incremental global routing after remove_buffer
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source "helpers.tcl"
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if { ![info exists repair_args] } {
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set repair_args {}
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}
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read_liberty Nangate45/Nangate45_typ.lib
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read_lef Nangate45/Nangate45.lef
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read_def remove_buffers6.def
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initialize_floorplan -die_area "0 0 40 1200" \
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-core_area "0 0 40 1200" \
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-site FreePDK45_38x28_10R_NP_162NW_34O
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source Nangate45/Nangate45.vars
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source Nangate45/Nangate45.rc
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source $tracks_file
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create_clock -period 0.3 clk
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set_propagated_clock clk
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detailed_placement
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source Nangate45/Nangate45.rc
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# Intentionaly reduce RC so there is a large discrepancy between
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# placement and global route parasitics.
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set_wire_rc -resistance 0.0001 -capacitance 0.00001
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set_routing_layers -signal $global_routing_layers
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global_route
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estimate_parasitics -global_routing
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# 0. WNS - pre
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report_worst_slack -max
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#set_debug_level RSZ repair_setup 10
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#set_debug_level RSZ opt_moves 10
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#set_debug_level RSZ remove_buffer 10
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#set_debug_level EST est_rc 10
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#set_debug_level GRT incr 10
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remove_buffers u5
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# 1. WNS - after remove_buffer
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report_worst_slack -max
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estimate_parasitics -global_routing
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# 2. WNS - after RC update
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report_worst_slack -max
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global_route
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estimate_parasitics -global_routing
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# 3. WNS - after redundant global routing
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report_worst_slack -max
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# WNS 1~3 should be the same

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