xls: examples: find_index: Add GDS generation rule

Generate GDS for process technologies:
* ASAP7
* SKY130

Signed-off-by: Pawel Czarnecki <pczarnecki@antmicro.com>

xls/examples/BUILD

@@ -32,6 +32,7 @@ load(
 load("@rules_hdl//verilog:providers.bzl", "verilog_library")
 load("@rules_hdl//synthesis:build_defs.bzl", "synthesize_rtl")
 load("@rules_hdl//place_and_route:build_defs.bzl", "place_and_route")
+load("@rules_hdl//gds_write:build_defs.bzl", "gds_write")
 
 package(
     default_applicable_licenses = ["//:license"],
@@ -422,7 +423,16 @@ verilog_library(
 )
 
 synthesize_rtl(
-    name = "find_index_5000ps_model_unit_verilog_synth",
+    name = "find_index_5000ps_model_unit_verilog_synth_sky130",
+    top_module = "find_index",
+    deps = [
+        ":find_index_5000ps_model_unit_verilog",
+    ],
+)
+
+synthesize_rtl(
+    name = "find_index_5000ps_model_unit_verilog_synth_asap7",
+	standard_cells = "@org_theopenroadproject_asap7//:asap7_rvt_1x",
     top_module = "find_index",
     deps = [
         ":find_index_5000ps_model_unit_verilog",
@@ -580,15 +590,35 @@ verilog_library(
 )
 
 place_and_route(
-    name = "find_index_place_and_route",
+    name = "find_index_place_and_route_sky130",
+    # ~64 MhZ
+    clock_period = "15.42857143",
+    core_padding_microns = 10,
+    placement_density = "0.8",
+    synthesized_rtl = ":find_index_5000ps_model_unit_verilog_synth_sky130",
+    target_die_utilization_percentage = "30",
+)
+
+gds_write(
+	name = "find_index_gds_sky130",
+	implemented_rtl = ":find_index_place_and_route_sky130",
+)
+
+place_and_route(
+    name = "find_index_place_and_route_asap7",
     # ~64 MhZ
     clock_period = "15.42857143",
-    core_padding_microns = 30,
+    core_padding_microns = 2,
     placement_density = "0.8",
-    synthesized_rtl = ":find_index_5000ps_model_unit_verilog_synth",
+    synthesized_rtl = ":find_index_5000ps_model_unit_verilog_synth_asap7",
     target_die_utilization_percentage = "30",
 )
 
+gds_write(
+	name = "find_index_gds_asap7",
+	implemented_rtl = ":find_index_place_and_route_asap7",
+)
+
 xls_dslx_library(
     name = "apfloat_fmac_dslx",
     srcs = ["apfloat_fmac.x"],