From 27e5bf5aad229ef330bfea932f6b194ec5c09b68 Mon Sep 17 00:00:00 2001 From: Eddie Hung Date: Thu, 26 Sep 2019 09:57:11 -0700 Subject: Stop trying to be too smart by prematurely optimising --- techlibs/xilinx/synth_xilinx.cc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'techlibs/xilinx') diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index ca108e9d6..b87fa9f6f 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -346,7 +346,9 @@ struct SynthXilinxPass : public ScriptPass "-D DSP_A_MINWIDTH=2 -D DSP_B_MINWIDTH=2 " // Blocks Nx1 multipliers "-D DSP_Y_MINWIDTH=9 " // UG901 suggests small multiplies are those 4x4 and smaller "-D DSP_SIGNEDONLY=1 -D DSP_NAME=$__MUL25X18"); - run("wreduce t:$add"); + run("opt_expr -fine a:mul2dsp"); + run("wreduce a:mul2dsp"); + run("setattr -unset mul2dsp a:mul2dsp"); run("xilinx_dsp"); run("chtype -set $mul t:$__soft_mul"); } -- cgit v1.2.3