Stop trying to be too smart by prematurely optimising

[yosys.git] / techlibs / xilinx / synth_xilinx.cc

diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index ca108e9d6ea5d034d1029413920445a560849e25..b87fa9f6ffbd9ec0e2d738915b33ba3168ed4e45 100644 (file)
--- 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");
                        }