From bd1cbefcd5a8aeed69c6332e02f6c47fecdfb469 Mon Sep 17 00:00:00 2001
From: James Cherry <cherry@parallaxsw.com>
Date: Fri, 1 May 2026 10:32:20 -0700
Subject: [PATCH] write_sdc -mode

Signed-off-by: James Cherry <cherry@parallaxsw.com>
---
 doc/ChangeLog.txt  |  7 +++++++
 include/sta/Sta.hh |  7 +++++++
 sdc/Sdc.i          | 14 +++++++-------
 sdc/Sdc.tcl        | 11 ++++++++---
 sdf/Sdf.tcl        |  2 +-
 search/Search.i    | 12 ++++++++++++
 search/Sta.cc      | 16 ++++++++++++++++
 7 files changed, 58 insertions(+), 11 deletions(-)

diff --git a/doc/ChangeLog.txt b/doc/ChangeLog.txt
index b6238246..496aab91 100644
--- a/doc/ChangeLog.txt
+++ b/doc/ChangeLog.txt
@@ -4,6 +4,13 @@ OpenSTA Timing Analyzer Release Notes
 This file summarizes user visible changes for each release.
 See ApiChangeLog.txt for changes to the STA api.
 
+2026/05/01
+----------
+
+The write_sdc command supports a -mode argument.
+
+  read_sdc [-mode mode]
+
 2026/03/23
 ----------
 
diff --git a/include/sta/Sta.hh b/include/sta/Sta.hh
index 5f9c1362..5237ec9a 100644
--- a/include/sta/Sta.hh
+++ b/include/sta/Sta.hh
@@ -1041,6 +1041,13 @@ public:
                               const Scene *scene,
                               const MinMax *min_max,
                               int digits);
+  void writeSdc(std::string_view filename,
+                std::string_view mode_name,
+                bool leaf,
+                bool native,
+                int digits,
+                bool gzip,
+                bool no_timestamp);
   void writeSdc(const Sdc *sdc,
                 std::string_view filename,
                 // Map hierarchical pins and instances to leaf pins and instances.
diff --git a/sdc/Sdc.i b/sdc/Sdc.i
index 0a02cb07..4b3050b0 100644
--- a/sdc/Sdc.i
+++ b/sdc/Sdc.i
@@ -94,15 +94,15 @@ private:
 
 void
 write_sdc_cmd(std::string filename,
-             bool leaf,
-             bool compatible,
-             int digits,
-             bool gzip,
-             bool no_timestamp)
+              std::string mode_name,
+              bool leaf,
+              bool compatible,
+              int digits,
+              bool gzip,
+              bool no_timestamp)
 {
   Sta *sta = Sta::sta();
-  const Sdc *sdc = sta->cmdSdc();
-  sta->writeSdc(sdc, filename, leaf, compatible, digits, gzip, no_timestamp);
+  sta->writeSdc(filename, mode_name, leaf, compatible, digits, gzip, no_timestamp);
 }
 
 void
diff --git a/sdc/Sdc.tcl b/sdc/Sdc.tcl
index 4c11522b..ead9a778 100644
--- a/sdc/Sdc.tcl
+++ b/sdc/Sdc.tcl
@@ -62,13 +62,18 @@ proc_redirect read_sdc {
 ################################################################
 
 define_cmd_args "write_sdc" \
-  {[-map_hpins] [-digits digits] [-gzip] [-no_timestamp] filename}
+  {[-mode mode] [-map_hpins] [-digits digits] [-gzip] [-no_timestamp] filename}
 
 proc write_sdc { args } {
-  parse_key_args "write_sdc" args keys {-digits -significant_digits} \
+  parse_key_args "write_sdc" args keys {-mode -digits} \
     flags {-map_hpins -compatible -gzip -no_timestamp}
   check_argc_eq1 "write_sdc" $args
 
+  set mode [cmd_mode]
+  if { [info exists keys(-mode)] } {
+    set mode $keys(-mode)
+  }
+  
   set digits 4
   if { [info exists keys(-digits)] } {
     set digits $keys(-digits)
@@ -80,7 +85,7 @@ proc write_sdc { args } {
   set no_timestamp [info exists flags(-no_timestamp)]
   set map_hpins [info exists flags(-map_hpins)]
   set native [expr ![info exists flags(-compatible)]]
-  write_sdc_cmd $filename $map_hpins $native $digits $gzip $no_timestamp
+  write_sdc_cmd $filename $mode $map_hpins $native $digits $gzip $no_timestamp
 }
 
 ################################################################
diff --git a/sdf/Sdf.tcl b/sdf/Sdf.tcl
index df0a775c..bdbb1de8 100644
--- a/sdf/Sdf.tcl
+++ b/sdf/Sdf.tcl
@@ -180,7 +180,7 @@ define_cmd_args "write_sdf" \
 
 proc_redirect write_sdf {
   parse_key_args "write_sdf" args \
-    keys {-corner -scene -divider -digits -significant_digits} \
+    keys {-corner -scene -divider -digits} \
     flags {-include_typ -gzip -no_timestamp -no_version}
   check_argc_eq1 "write_sdf" $args
   set scene [parse_scene keys]
diff --git a/search/Search.i b/search/Search.i
index 85de21d5..d3eb7455 100644
--- a/search/Search.i
+++ b/search/Search.i
@@ -816,6 +816,12 @@ cmd_mode_name()
   return Sta::sta()->cmdMode()->name();
 }
 
+Mode *
+cmd_mode()
+{
+  return Sta::sta()->cmdMode();
+}
+
 void
 set_cmd_mode(std::string mode_name)
 {
@@ -828,6 +834,12 @@ find_modes(std::string mode_name)
   return Sta::sta()->findModes(mode_name);
 }
 
+Mode *
+find_mode(std::string mode_name)
+{
+  return Sta::sta()->findMode(mode_name);
+}
+
 ////////////////////////////////////////////////////////////////
 
 CheckErrorSeq &
diff --git a/search/Sta.cc b/search/Sta.cc
index 6593b16d..357256d0 100644
--- a/search/Sta.cc
+++ b/search/Sta.cc
@@ -2206,6 +2206,22 @@ Sta::checkExceptionToPins(ExceptionTo *to,
   }
 }
 
+void
+Sta::writeSdc(std::string_view filename,
+              std::string_view mode_name,
+              bool leaf,
+              bool native,
+              int digits,
+              bool gzip,
+              bool no_timestamp)
+{
+  Mode *mode = findMode(mode_name);
+  if (mode)
+    writeSdc(mode->sdc(), filename, leaf, native, digits, gzip, no_timestamp);
+  else
+    report_->warn(1561, "mode {} not found.", mode_name);
+}
+
 void
 Sta::writeSdc(const Sdc *sdc,
               std::string_view filename,