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xiangshan: the parent repairs setup at global route, 3,276 to 2,406 ps - #1212
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The parent's worst paths are a mass of CtrlBlock control (a false-path peel: about 9 ps a register over 40), and the repairs before global route time them with estimated wires. With the route's parasitics the stage's own setup repair takes the parent from 3,276 to 2,406 ps on row 14's build (#1187 at f681c30): 1,525 VT swaps, 74 buffers, 34 pin swaps; its worst path is now CtrlBlock's flush redirect into Frontend. The blocks are unchanged, so the design period is the parent's, 2,406. SKIP_INCREMENTAL_REPAIR goes from the parent; HOLD_SLACK_MARGIN -1000 in its grt stage leaves hold to CTS's repair, as this stage's hold repair took an earlier run of it to 120 GB. Global route costs 84 min against 19 and peaks at 102 GB against 83. KPI row 15 is that measurement, in flight like rows 13 and 14: it was built on #1187's commit, not on main. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
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The parent's setup repair at global route, with the route's parasitics: 3,276 to 2,406 ps (-26.6 %), the design period with it (the slowest block is MemBlock at 1,870).
Why: the parent's worst paths are a mass of CtrlBlock control, not one path (a false-path peel: about 9 ps a register over 40 registers), and every repair before global route times them with estimated wires. The repair: 1,525 VT swaps, 74 buffers, 34 pin swaps. The new worst path is CtrlBlock's flush redirect into Frontend.
The change, in the parent only:
SKIP_INCREMENTAL_REPAIRdropped, so ORFS's grt stage repairs.HOLD_SLACK_MARGIN = -1000in the grt stage only: hold stays with CTS's repair; this stage's hold repair took an earlier run to 120 GB.Measured on #1187's commit f681c30 (row 14's build), not on main: KPI row 15 is in flight like rows 13 and 14. A confirmation build of this branch on main is running and will add its row here.
Not tested locally beyond
fix_lint.🤖 Generated with Claude Code