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| author | Eddie Hung <eddie@fpgeh.com> | 2019-09-26 09:57:11 -0700 |
|---|---|---|
| committer | Eddie Hung <eddie@fpgeh.com> | 2019-09-26 09:57:11 -0700 |
| commit | 27e5bf5aad229ef330bfea932f6b194ec5c09b68 (patch) | |
| tree | 1cc494f9b2e75298da55df2303c8f833a20ff86f /techlibs/xilinx | |
| parent | 35aaa8d73a75f36a42eea9ef2b210d9e79e5edc3 (diff) | |
| download | yosys-27e5bf5aad229ef330bfea932f6b194ec5c09b68.tar.gz yosys-27e5bf5aad229ef330bfea932f6b194ec5c09b68.tar.bz2 yosys-27e5bf5aad229ef330bfea932f6b194ec5c09b68.zip | |
Stop trying to be too smart by prematurely optimising
Diffstat (limited to 'techlibs/xilinx')
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 4 |
1 files changed, 3 insertions, 1 deletions
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"); } |