Add split_shiftx command

1 files changed, 78 insertions, 0 deletions

diff --git a/passes/pmgen/split_shiftx.cc b/passes/pmgen/split_shiftx.cc
new file mode 100644
index 000000000..71fb4e9ef
--- /dev/null
+++ b/passes/pmgen/split_shiftx.cc
@@ -0,0 +1,78 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+#include "passes/pmgen/split_shiftx_pm.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+void create_split_shiftx(split_shiftx_pm &pm)
+{
+	if (pm.st.shiftxB.empty())
+		return;
+	log_assert(pm.st.shiftx);
+	SigSpec A = pm.st.shiftx->getPort("\\A");
+	SigSpec Y = pm.st.shiftx->getPort("\\Y");
+	const int A_WIDTH = pm.st.shiftx->getParam("\\A_WIDTH").as_int();
+	const int Y_WIDTH = pm.st.shiftx->getParam("\\Y_WIDTH").as_int();
+	log_assert(Y_WIDTH > 1);
+	std::vector<SigBit> bits;
+	bits.resize(A_WIDTH / Y_WIDTH);
+	for (int i = 0; i < Y_WIDTH; ++i) {
+		for (int j = 0; j < A_WIDTH/Y_WIDTH; ++j)
+			bits[j] = A[j*Y_WIDTH + i];
+		pm.module->addShiftx(NEW_ID, bits, pm.st.shiftxB, Y[i]);
+	}
+	pm.st.shiftx->unsetPort("\\Y");
+
+	pm.autoremove(pm.st.shiftx);
+	pm.autoremove(pm.st.macc);
+}
+
+struct BitblastShiftxPass : public Pass {
+	BitblastShiftxPass() : Pass("split_shiftx", "Split up multi-bit $shiftx cells") { }
+	void help() YS_OVERRIDE
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    split_shiftx [selection]\n");
+		log("\n");
+		log("Split up $shiftx cells where Y_WIDTH > 1, with consideration for any $macc\n");
+		log("cells that may be driving their B inputs.\n");
+		log("\n");
+	}
+	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		log_header(design, "Executing SPLIT_SHIFTX pass.\n");
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++)
+		{
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		for (auto module : design->selected_modules())
+			split_shiftx_pm(module, module->selected_cells()).run(create_split_shiftx);
+	}
+} BitblastShiftxPass;
+
+PRIVATE_NAMESPACE_END