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xilinx_dsp: Add multonly scratchpad var to bypass

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2020-01-27 11:19:27 +00:00
parent b7be6cfd65
commit 65716c9982
1 changed files with 7 additions and 0 deletions
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7
passes/pmgen/xilinx_dsp.cc
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@ -767,6 +767,9 @@ struct XilinxDspPass : public Pass {
log("to a maximum length of 20 cells, corresponding to the smallest Xilinx 7 Series\n");
log("device.\n");
log("\n");
log("This pass is a no-op if the scratchpad variable 'xilinx_dsp.multonly' is set\n");
log("to 1.\n");
log("\n");
log("\n");
log("Experimental feature: addition/subtractions less than 12 or 24 bits with the\n");
log("'(* use_dsp=\"simd\" *)' attribute attached to the output wire or attached to\n");
@ -805,6 +808,10 @@ struct XilinxDspPass : public Pass {
family = "xcu";
for (auto module : design->selected_modules()) {
if (design->scratchpad_get_bool("xilinx_dsp.multonly"))
continue;
// Experimental feature: pack $add/$sub cells with
// (* use_dsp48="simd" *) into DSP48E1's using its
// SIMD feature