From f96d82a5f1982ea86cf02182b33abe91c015b10d Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Wed, 24 Apr 2019 16:46:41 -0700 Subject: [PATCH] Add -nocarry option to synth_xilinx --- techlibs/xilinx/synth_xilinx.cc | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index 04b0dabca..9e4a86a84 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -63,6 +63,9 @@ struct SynthXilinxPass : public Pass log(" generate an output netlist (and BLIF file) suitable for VPR\n"); log(" (this feature is experimental and incomplete)\n"); log("\n"); + log(" -nocarry\n"); + log(" disable inference of carry chains\n"); + log("\n"); log(" -nobram\n"); log(" disable inference of block rams\n"); log("\n"); @@ -118,7 +121,7 @@ struct SynthXilinxPass : public Pass log(" memory_map\n"); log(" dffsr2dff\n"); log(" dff2dffe\n"); - log(" techmap -map +/xilinx/arith_map.v\n"); + log(" techmap -map +/xilinx/arith_map.v (without '-nocarry' only)\n"); log(" opt -fast\n"); log("\n"); log(" map_cells:\n"); @@ -161,6 +164,7 @@ struct SynthXilinxPass : public Pass bool flatten = false; bool retime = false; bool vpr = false; + bool nocarry = false; bool nobram = false; bool nodram = false; bool nosrl = false; @@ -201,6 +205,10 @@ struct SynthXilinxPass : public Pass vpr = true; continue; } + if (args[argidx] == "-nocarry") { + nocarry = true; + continue; + } if (args[argidx] == "-nobram") { nobram = true; continue; @@ -284,10 +292,11 @@ struct SynthXilinxPass : public Pass Pass::call(design, "dffsr2dff"); Pass::call(design, "dff2dffe"); - if (vpr) { - Pass::call(design, "techmap -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY"); - } else { - Pass::call(design, "techmap -map +/xilinx/arith_map.v"); + if (!nocarry) { + if (vpr) + Pass::call(design, "techmap -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY"); + else + Pass::call(design, "techmap -map +/xilinx/arith_map.v"); } Pass::call(design, "hierarchy -check"); -- 2.30.2