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grt: add new unit tests for estimate_path_resistance
Signed-off-by: Jonas Gava <[email protected]>
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‎src/grt/test/BUILD‎

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@@ -25,6 +25,7 @@ TESTS = [
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"est_rc2",
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"est_rc3",
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"est_rc4",
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"estimate_path_resistance",
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"gcd",
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"gcd_cugr",
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"gcd_flute",

‎src/grt/test/CMakeLists.txt‎

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@@ -23,6 +23,7 @@ or_integration_tests(
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est_rc2
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est_rc3
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est_rc4
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estimate_path_resistance
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gcd
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gcd_cugr
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gcd_flute

‎src/grt/test/estimate_path_resistance.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: gcd
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[INFO ODB-0130] Created 54 pins.
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[INFO ODB-0131] Created 676 components and 2850 component-terminals.
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[INFO ODB-0133] Created 579 nets and 1498 connections.
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Test 1: Basic usage with ITerms
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Estimating Path Resistance between pin (_858_/D) and pin (_762_/Z) through net (_000_)
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Via resistance: 5 - From metal1 to metal2 at (59850, 111150)
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Via resistance: 5 - From metal2 to metal3 at (59850, 111150)
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Wire resistance: 10.178572 - From (54150, 111150) - To (59850, 111150) - Layer metal3
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Via resistance: 5 - From metal3 to metal2 at (54150, 111150)
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Wire resistance: 10.178572 - From (54150, 105450) - To (54150, 111150) - Layer metal2
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Via resistance: 5 - From metal2 to metal1 at (54150, 105450)
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Total Resistance: 40.357143 ohms
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Resistance: 40.35714340209961
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Test 2: Usage with layers
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Estimating Path Resistance between pin (_858_/D) and pin (_762_/Z) using layers metal2 and metal3
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Via resistance (Start): 5 - From Layer metal1 to metal2
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Wire resistance: 10.178572 - From (54150, 105450) - To (54150, 111150) - Mapped Layer metal2
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Via resistance (Corner): 5 - Between metal3 and metal2
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Wire resistance: 10.178572 - From (54150, 111150) - To (59850, 111150) - Mapped Layer metal3
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Via resistance (End): 10 - From Layer metal1 to metal3
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Total Resistance: 40.357143 ohms
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Resistance: 40.35714340209961
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Test 3: Usage with BTerms
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Estimating resistance between BTerm clk and ITerm _858_/CK
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Estimating Path Resistance between pin (clk) and pin (_858_/CK) through net (clk)
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Via resistance: 5 - From metal1 to metal2 at (59850, 105450)
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Wire resistance: 10.178572 - From (59850, 111150) - To (59850, 105450) - Layer metal2
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Via resistance: 5 - From metal2 to metal3 at (59850, 111150)
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Wire resistance: 30.535713 - From (76950, 111150) - To (59850, 111150) - Layer metal3
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Wire resistance: 20.357143 - From (88350, 111150) - To (76950, 111150) - Layer metal3
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Via resistance: 5 - From metal3 to metal2 at (88350, 111150)
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Wire resistance: 20.357143 - From (88350, 122550) - To (88350, 111150) - Layer metal2
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Wire resistance: 20.357143 - From (88350, 133950) - To (88350, 122550) - Layer metal2
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Wire resistance: 10.178572 - From (88350, 139650) - To (88350, 133950) - Layer metal2
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Via resistance: 5 - From metal2 to metal3 at (88350, 139650)
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Wire resistance: 10.178572 - From (94050, 139650) - To (88350, 139650) - Layer metal3
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Via resistance: 5 - From metal3 to metal4 at (94050, 139650)
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Wire resistance: 17.1 - From (94050, 162450) - To (94050, 139650) - Layer metal4
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Via resistance: 3 - From metal4 to metal5 at (94050, 162450)
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Via resistance: 3 - From metal5 to metal6 at (94050, 162450)
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Wire resistance: 25.65 - From (94050, 196650) - To (94050, 162450) - Layer metal6
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Total Resistance: 195.89287 ohms
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Resistance: 195.8928680419922
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Test 4: Error handling - Invalid pin
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[ERROR GRT-0284] Pin invalid_pin not found.
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Expected error: GRT-0284
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Test 5: Error handling - Missing layer
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[ERROR GRT-0288] Both or neither -layer1 and -layer2 must be provided.
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Expected error: GRT-0288

‎src/grt/test/estimate_path_resistance.tcl‎

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# Test estimate_path_resistance command
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source "helpers.tcl"
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read_lef "Nangate45/Nangate45.lef"
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read_liberty Nangate45/Nangate45_typ.lib
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read_def "gcd.def"
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set_routing_layers -signal metal2-metal10
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global_route
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# Test 1: Basic usage with ITerms
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puts "Test 1: Basic usage with ITerms"
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set res [estimate_path_resistance _858_/D _762_/Z -verbose]
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puts "Resistance: $res"
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# Test 2: Usage with layers
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puts "\nTest 2: Usage with layers"
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set res [estimate_path_resistance _858_/D _762_/Z -layer1 metal2 -layer2 metal3 -verbose]
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puts "Resistance: $res"
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# Test 3: Usage with BTerms
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puts "\nTest 3: Usage with BTerms"
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puts "Estimating resistance between BTerm clk and ITerm _858_/CK"
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set res [estimate_path_resistance clk _858_/CK -verbose]
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puts "Resistance: $res"
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# Test 4: Error handling - Invalid pin
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puts "\nTest 4: Error handling - Invalid pin"
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catch {estimate_path_resistance "invalid_pin" _762_/Z} err
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puts "Expected error: $err"
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# Test 5: Error handling - Missing layer
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puts "\nTest 5: Error handling - Missing layer"
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catch {estimate_path_resistance _858_/D _762_/Z -layer1 metal2} err
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puts "Expected error: $err"

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