From 6f19de3916b7714a006d3beab060e2d4f86023a1 Mon Sep 17 00:00:00 2001
From: Zhiyu Zheng <1806471942@qq.com>
Date: Fri, 14 Nov 2025 14:07:18 +0800
Subject: [PATCH 1/3] Remove all pins placed check from global placement

Removed check for all pins placed before skipping global placement.
---
 flow/scripts/global_place_skip_io.tcl | 2 --
 1 file changed, 2 deletions(-)

diff --git a/flow/scripts/global_place_skip_io.tcl b/flow/scripts/global_place_skip_io.tcl
index b528856..ff05f36 100644
--- a/flow/scripts/global_place_skip_io.tcl
+++ b/flow/scripts/global_place_skip_io.tcl
@@ -4,8 +4,6 @@ load_design 2_floorplan.odb 2_floorplan.sdc
 
 if { [env_var_exists_and_non_empty FLOORPLAN_DEF] } {
   puts "FLOORPLAN_DEF is set. Skipping global placement without IOs"
-} elseif { [all_pins_placed] } {
-  puts "All pins are placed. Skipping global placement without IOs"
 } else {
   log_cmd global_placement -skip_io -density [place_density_with_lb_addon] \
     -pad_left $::env(CELL_PAD_IN_SITES_GLOBAL_PLACEMENT) \

From 12f1f41200b1820ea1ea379127d42f9e4a8bbcb6 Mon Sep 17 00:00:00 2001
From: Zhiyu Zheng <1806471942@qq.com>
Date: Fri, 14 Nov 2025 14:08:37 +0800
Subject: [PATCH 2/3] Add Kogge-Stone LCU module implementation

---
 flow/platforms/common/lcu_kogge_stone.v | 34 +++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 flow/platforms/common/lcu_kogge_stone.v

diff --git a/flow/platforms/common/lcu_kogge_stone.v b/flow/platforms/common/lcu_kogge_stone.v
new file mode 100644
index 0000000..e865c07
--- /dev/null
+++ b/flow/platforms/common/lcu_kogge_stone.v
@@ -0,0 +1,34 @@
+(* techmap_celltype = "$lcu" *)
+module _80_lcu_kogge_stone (P, G, CI, CO);
+	parameter WIDTH = 2;
+
+	(* force_downto *)
+	input [WIDTH-1:0] P, G;
+	input CI;
+
+	(* force_downto *)
+	output [WIDTH-1:0] CO;
+
+	integer i, j;
+	(* force_downto *)
+	reg [WIDTH-1:0] p, g;
+
+	wire [1023:0] _TECHMAP_DO_ = "proc; opt -fast";
+
+	always @* begin
+		p = P;
+		g = G;
+
+		// in almost all cases CI will be constant zero
+		g[0] = g[0] | (p[0] & CI);
+
+		for (i = 0; i < $clog2(WIDTH); i = i + 1) begin
+			for (j = WIDTH - 1; j >= 2**i; j = j - 1) begin
+				g[j] = g[j] | p[j] & g[j - 2**i];
+				p[j] = p[j] & p[j - 2**i];
+			end
+		end
+	end
+
+	assign CO = g;
+endmodule

From 1de8c4736b0c14028e4fdb91e257055ec78f70fd Mon Sep 17 00:00:00 2001
From: shifengzhicheng <75062138+shifengzhicheng@users.noreply.github.com>
Date: Fri, 14 Nov 2025 06:10:06 +0000
Subject: [PATCH 3/3] [BOT] Update yosys submodule

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 tools/yosys | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/yosys b/tools/yosys
index 863f409..9ed031d 160000
--- a/tools/yosys
+++ b/tools/yosys
@@ -1 +1 @@
-Subproject commit 863f40978e798f8002bac989a1cb1c755ef1165e
+Subproject commit 9ed031ddd588442f22be13ce608547a5809b62f0