Disable SizeDown by default.

Signed-off-by: Matthew Guthaus <[email protected]>

Author: mguthaus

src/rsz/README.md

@@ -247,7 +247,7 @@ repair_timing
 | `-setup_margin` | Add additional setup slack margin. |
 | `-hold_margin` | Add additional hold slack margin. |
 | `-allow_setup_violations` | While repairing hold violations, buffers are not inserted that will cause setup violations unless `-allow_setup_violations` is specified. |
-| `-sequence` | Specify a particular order of setup timing optimizations. The default is "unbuffer,vt_swap,sizeup,sizedown,swap,buffer,clone,split". Obeys skip flags also. |
+| `-sequence` | Specify a particular order of setup timing optimizations. The default is "unbuffer,vt_swap,sizeup,swap,buffer,clone,split". Obeys skip flags also. |
 | `-skip_pin_swap` | Flag to skip pin swap. The default is to perform pin swap transform during setup fixing. |
 | `-skip_gate_cloning` | Flag to skip gate cloning. The default is to perform gate cloning transform during setup fixing. |
 | `-skip_size_down` | Flag to skip gate down sizing. The default is to perform non-critical fanout gate down sizing transform during setup fixing. |

src/rsz/src/RepairSetup.cc

@@ -173,7 +173,7 @@ bool RepairSetup::repairSetup(const float setup_slack_margin,
     move_sequence.push_back(resizer_->size_up_move_.get());
     // Disabled by default for now
     if (!skip_size_down) {
-      move_sequence.push_back(resizer_->size_down_move_.get());
+      // move_sequence.push_back(resizer_->size_down_move_.get());
     }
     if (!skip_pin_swap) {
       move_sequence.push_back(resizer_->swap_pins_move_.get());