From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 23 Aug 2019 23:41:32 +0000 (-0700)
Subject: Add undocumented feature
X-Git-Tag: working-ls180~1103
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d7051b90de19ba0faed0a4eff4af7c3bc92dd3fd;p=yosys.git

Add undocumented feature
---

diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 7ba67409b..87f4af8f7 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -105,6 +105,7 @@ struct SynthXilinxPass : public ScriptPass
 
 	std::string top_opt, edif_file, blif_file, family;
 	bool flatten, retime, vpr, nobram, nolutram, nosrl, nocarry, nowidelut, abc9;
+	bool flatten_before_abc;
 	int widemux;
 
 	void clear_flags() YS_OVERRIDE
@@ -123,6 +124,7 @@ struct SynthXilinxPass : public ScriptPass
 		nocarry = false;
 		nowidelut = false;
 		abc9 = false;
+		flatten_before_abc = false;
 		widemux = 0;
 	}
 
@@ -162,6 +164,10 @@ struct SynthXilinxPass : public ScriptPass
 				flatten = true;
 				continue;
 			}
+			if (args[argidx] == "-flatten_before_abc") {
+				flatten_before_abc = true;
+				continue;
+			}
 			if (args[argidx] == "-retime") {
 				retime = true;
 				continue;
@@ -385,6 +391,8 @@ struct SynthXilinxPass : public ScriptPass
 
 		if (check_label("map_luts")) {
 			run("opt_expr -mux_undef");
+			if (flatten_before_abc)
+				run("flatten");
 			if (help_mode)
 				run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(option for 'nowidelut', option for '-retime')");
 			else if (abc9) {