From 4cd8f0297381c5fb9fe3b8cbb22d4240f2aaae63 Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Tue, 19 Mar 2019 15:05:08 -0700 Subject: [PATCH 1/1] shregmap -tech xilinx to delete $shiftx for var length SRL --- passes/techmap/shregmap.cc | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/passes/techmap/shregmap.cc b/passes/techmap/shregmap.cc index 3b3170e04..bd537e7c2 100644 --- a/passes/techmap/shregmap.cc +++ b/passes/techmap/shregmap.cc @@ -187,19 +187,12 @@ struct ShregmapTechXilinx7 : ShregmapTech if (it == sigbit_to_shiftx_offset.end()) return true; - auto cell_q = cell->getPort("\\Q"); - log_assert(cell_q.is_bit()); - Cell* shiftx = it->second.first; - // FIXME: Hack to ensure that $shiftx gets optimised away - // Without this, Yosys will refuse to optimise away a $shiftx - // where \\A 's width is not perfectly \\B_WIDTH ** 2 - // See YosysHQ/yosys#878 - auto shiftx_bwidth = shiftx->getParam("\\B_WIDTH").as_int(); - shiftx->setPort("\\A", cell_q.repeat(1 << shiftx_bwidth)); - shiftx->setParam("\\A_WIDTH", 1 << shiftx_bwidth); cell->setPort("\\L", shiftx->getPort("\\B")); + cell->setPort("\\Q", shiftx->getPort("\\Y")); + + cell->module->remove(shiftx); return true; } -- 2.30.2