diff options
Diffstat (limited to 'passes/pmgen/xilinx_dsp.cc')
| -rw-r--r-- | passes/pmgen/xilinx_dsp.cc | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/passes/pmgen/xilinx_dsp.cc b/passes/pmgen/xilinx_dsp.cc index 3ff921957..054e123e4 100644 --- a/passes/pmgen/xilinx_dsp.cc +++ b/passes/pmgen/xilinx_dsp.cc @@ -609,8 +609,13 @@ struct XilinxDspPass : public Pass { extra_args(args, argidx, design); for (auto module : design->selected_modules()) { + // Experimental feature: pack $add/$sub cells with + // (* use_dsp48="simd" *) into DSP48E1's using its + // SIMD feature xilinx_simd_pack(module, module->selected_cells()); + // Match for all features ([ABDMP][12]?REG, pre-adder, + // post-adder, pattern detector, etc.) except for CREG { xilinx_dsp_pm pm(module, module->selected_cells()); pm.run_xilinx_dsp_pack(xilinx_dsp_pack); @@ -619,14 +624,17 @@ struct XilinxDspPass : public Pass { // is no guarantee that the cell ordering corresponds // to the "expected" case (i.e. the order in which // they appear in the source) thus the possiblity - // existed that a register got packed as CREG into a + // existed that a register got packed as a CREG into a // downstream DSP that should have otherwise been a - // PREG of an upstream DSP that had not been pattern - // matched yet + // PREG of an upstream DSP that had not been visited + // yet { xilinx_dsp_CREG_pm pm(module, module->selected_cells()); pm.run_xilinx_dsp_packC(xilinx_dsp_packC); } + // Lastly, identify and utilise PCOUT -> PCIN, + // ACOUT -> ACIN, and BCOUT-> BCIN dedicated cascade + // chains { xilinx_dsp_cascade_pm pm(module, module->selected_cells()); pm.run_xilinx_dsp_cascade(); |