added doc for -skip_crit_vt_swap

Signed-off-by: Cho Moon <[email protected]>

Author: precisionmoon

src/rsz/README.md

@@ -227,6 +227,7 @@ repair_timing
     [-skip_buffer_removal]
     [-skip_last_gasp]
     [-skip_vt_swap]
+    [-skip_crit_vt_swap]
     [-repair_tns tns_end_percent]
     [-max_passes passes]
     [-max_repairs_per_pass max_repairs_per_pass]
@@ -254,6 +255,7 @@ repair_timing
 | `-skip_buffer_removal` | Flag to skip buffer removal.  The default is to perform buffer removal transform during setup fixing. |
 | `-skip_last_gasp` | Flag to skip final ("last gasp") optimizations.  The default is to perform greedy sizing at the end of optimization. |
 | `-skip_vt_swap` | Flag to skip threshold voltage (VT) swap optimizations.  The default is to perform VT swap optimization to improve timing QoR. |
+| `-skip_crit_vt_swap` | Flag to skip critical threshold voltage (VT) swap optimizations at the end of optimization.  The default is to perform critical VT swap optimization to improve timing QoR beyond repairing just the worst path per each violating endpoint. |
 | `-repair_tns` | Percentage of violating endpoints to repair (0-100). When `tns_end_percent` is zero, only the worst endpoint is repaired. When `tns_end_percent` is 100 (default), all violating endpoints are repaired. |
 | `-max_repairs_per_pass` | Maximum repairs per pass, default is 1. On the worst paths, the maximum number of repairs is attempted. It gradually decreases until the final violations which only get 1 repair per pass. |
 | `-max_utilization` | Defines the percentage of core area used. |