832c62b579
Refactor DMP solver to use Eigen and implement Determinant Guarded solver ( #450 )
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This commit refactors the Dartu-Menezes-Pileggi (DMP) effective capacitance
algorithm solver to use the Eigen library, and implements a Determinant Guarded
solver to handle singular and near-singular Jacobians safely and efficiently.
Key changes:
1. Refactored the DMP solver to use Eigen stack-based data structures,
replacing the custom Crout LU decomposition and solver.
2. Extracted the linear solver logic into a dedicated helper function
DmpAlg::solveNewtonStep.
3. Implemented a "Determinant Guarded" solver:
- Manually checks the determinant of the Jacobian (safety guard).
- Throws a DmpError if the determinant is dangerously close to zero (|det| < 1e-12),
safely triggering the lumped capacitance fallback.
- Otherwise, solves using Eigen's highly optimized analytical inverse (fast path).
4. Added documentation in the comments on how to easily swap back to LU
decomposition with partial pivoting (PartialPivLU) if any numerical
precision issues arise in the future.
Benchmark Results (Optimized Release Build, 5,288 DMP calls):
| Test Case | Calls | 1. Original (Crout LU) | 2. Eigen (PartialPivLU) | 3. Eigen (Determinant Guarded) | Speedup (3 vs 1) | Speedup (3 vs 2) |
| :--- | :---: | :---: | :---: | :---: | :---: | :---: |
| power | 2,608 | 1.8822 ms | 1.6791 ms | 1.2702 ms | +32.5% | +24.4% |
| power_vcd | 2,608 | 1.8729 ms | 1.6704 ms | 1.2768 ms | +31.8% | +23.6% |
| spef_parasitics | 24 | 0.0193 ms | 0.0187 ms | 0.0140 ms | +27.5% | +25.1% |
| mcmm3 | 48 | 0.0728 ms | 0.0756 ms | 0.0817 ms | -12.2% | -8.1% |
| Total DMP Time | 5,288 | 3.8472 ms | 3.4438 ms | 2.6427 ms | +31.3% | +23.3% |
2026-06-18 13:52:14 -07:00
0fe167a80d
sta_internal_bidirect_instance_paths_enabled use load->driver edges
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Signed-off-by: James Cherry <cherry@CerezoBook.local>
2026-06-15 17:02:58 -07:00
9065d915db
copy() use copy constructors
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-05-05 17:25:09 -07:00
801d621d6b
Dmp delay calc inline algs
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-05-05 17:08:16 -07:00
7fca318611
copy() use copy constructors
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-05-05 16:58:59 -07:00
afa2286edc
copy() use copy constructors
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-05-05 16:35:40 -07:00
1eb2e9b11d
untabify
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-25 14:45:49 -07:00
a1c3077139
message ids
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-23 18:12:40 -07:00
c8b9ffb22d
tidy
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-21 17:30:35 -07:00
6e7ec45bc8
rm extra swig module dcls
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-16 15:46:32 -07:00
12c59878ee
prima non-ccs report dcalc resolves #418
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-16 15:13:28 -07:00
21848bcdd2
clang tidy
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-15 09:38:10 -07:00
63efee64bf
tidy round1
2026-04-13 14:59:05 -07:00
b136ba309a
PrimaDelayCalc::reportGateDelay resolves #418
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-09 15:13:40 -07:00
645f2669c9
report_dcalc prima resolves #418
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-07 10:45:04 -07:00
84150e925b
prima ceff
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-04 09:21:34 -07:00
aedddcecd8
DMP use std::array
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-04 09:21:01 -07:00
2f85fdfee3
Dmp cleanup
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-03 16:46:05 -07:00
e04f36b541
GraphDelayCalc::findInputArcDelay rm Slew
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-03 11:22:38 -07:00
5d40134239
ArnoldiDelayCalc rcmodel
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-04-03 11:22:38 -07:00
638ffa57d4
cleanup
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-31 16:45:47 -07:00
8c1ebce695
GraphDelayCalc::findInputDriverDelay rm finishDrvrPin
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-31 16:37:38 -07:00
1d4b516239
GraphDelayCalc::findInputArcDelay thread issue
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-31 13:59:59 -07:00
6742692876
string squash
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-28 19:13:35 -07:00
b9e439f41c
delay calc clip delay to 0.0 resolves #405
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-24 18:42:47 -07:00
04f4528c2c
ccs ceff pocv
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-22 19:34:59 -07:00
73c2cca24c
delayAsString
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-18 16:33:15 -07:00
61b2a4b2c3
indent
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-16 16:29:10 -07:00
134b547501
use std::format squash
2026-03-16 15:01:38 -07:00
5fbd2a18b5
Graph::slew/arcDelay rm static
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-16 14:53:02 -07:00
d6e7b4256c
lvf squish
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-13 14:06:35 -07:00
0a5b95a523
CcsCeffDelayCalc::loadDelaySlew
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-13 10:19:07 -07:00
818596f25a
LumpedCapDelayCalc::makeResult resolves #403
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-12 15:53:10 -07:00
981f44db68
update copyright
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-10 14:57:45 -07:00
129d007f76
override
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-09 17:43:03 -07:00
28b9401e31
const
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-08 16:15:24 -07:00
859982bdc7
StdStringSeq -> StringSeq
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-08 15:51:50 -07:00
d7905a3886
delay_calcs use std::string
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-08 14:41:22 -07:00
c2c40f76b1
DmpAlg
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-08 14:03:53 -07:00
c7ba405a14
comment
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-08 13:59:22 -07:00
d8c0e9285b
RiseFall use shortName instead of to_string
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-06 12:02:05 -07:00
741bf4d561
rm using std::
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-02 12:13:13 -08:00
94b8fd8f37
dcalc threshold adjustment
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-03-01 17:33:20 -08:00
a6425a3364
FindMessages criticalError
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-02-28 14:51:09 -08:00
33e480a6c1
liberty memory management
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-02-04 18:33:04 -07:00
e5ee0fdb24
fmt
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-01-13 09:36:51 -07:00
4fbe16e5a4
ApiChanges
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-01-13 09:36:51 -07:00
d42b821c00
rel 3.0
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-01-13 09:36:45 -07:00
9d401d1c0e
dcalc bfs incr level/hercules_is_int 0.3 correlation
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Signed-off-by: James Cherry <cherry@parallaxsw.com>
2026-01-06 14:37:26 -08:00
c4b94c3ee5
Add missing system header includes. ( #330 )
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Signed-off-by: Sean Luchen <seanluchen@google.com>
2025-11-17 09:23:32 -08:00
Drew Lewis
James Cherry
James Cherry
Logikable