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Perform C -> PCIN optimisation after pattern matcher

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This commit is contained in:
Eddie Hung 2019-08-13 17:11:35 -07:00
parent 1b0e68db94
commit 2f04beeeb5
2 changed files with 72 additions and 19 deletions
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67
passes/pmgen/xilinx_dsp.cc
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@ -23,22 +23,23 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
template<class T> bool includes(const T &lhs, const T &rhs) {
template<class T> inline bool includes(const T &lhs, const T &rhs) {
return std::includes(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
}
#include <set>
#include "passes/pmgen/xilinx_dsp_pm.h"
void pack_xilinx_dsp(xilinx_dsp_pm &pm)
void pack_xilinx_dsp(dict<SigBit, Cell*> &bit_to_driver, xilinx_dsp_pm &pm)
{
auto &st = pm.st_xilinx_dsp;
#if 1
log("\n");
log("ffA: %s\n", log_id(st.ffA, "--"));
log("ffB: %s\n", log_id(st.ffB, "--"));
log("dsp: %s\n", log_id(st.dsp, "--"));
log("addAB: %s\n", log_id(st.addAB, "--"));
log("ffP: %s\n", log_id(st.ffP, "--"));
log("ffA: %s\n", log_id(st.ffA, "--"));
log("ffB: %s\n", log_id(st.ffB, "--"));
log("dsp: %s\n", log_id(st.dsp, "--"));
log("addAB: %s\n", log_id(st.addAB, "--"));
log("ffP: %s\n", log_id(st.ffP, "--"));
//log("muxP: %s\n", log_id(st.muxP, "--"));
log("sigPused: %s\n", log_signal(st.sigPused));
#endif
@ -46,11 +47,17 @@ void pack_xilinx_dsp(xilinx_dsp_pm &pm)
log("Analysing %s.%s for Xilinx DSP packing.\n", log_id(pm.module), log_id(st.dsp));
Cell *cell = st.dsp;
bit_to_driver.insert(std::make_pair(cell->getPort("\\P")[17], cell));
SigSpec P = st.sigP;
if (st.addAB) {
log_assert(st.addAB->getParam("\\A_SIGNED").as_bool());
log_assert(st.addAB->getParam("\\B_SIGNED").as_bool());
log(" adder %s (%s)\n", log_id(st.addAB), log_id(st.addAB->type));
cell->setPort("\\C", st.sigC.extend_u0(48, true));
SigSpec C = st.sigC;
C.extend_u0(48, true);
cell->setPort("\\C", C);
SigSpec &opmode = cell->connections_.at("\\OPMODE");
opmode[6] = State::S0;
opmode[5] = State::S1;
@ -153,8 +160,48 @@ struct XilinxDspPass : public Pass {
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
xilinx_dsp_pm(module, module->selected_cells()).run_xilinx_dsp(pack_xilinx_dsp);
for (auto module : design->selected_modules()) {
xilinx_dsp_pm pm(module, module->selected_cells());
dict<SigBit, Cell*> bit_to_driver;
auto f = [&bit_to_driver](xilinx_dsp_pm &pm){ pack_xilinx_dsp(bit_to_driver, pm); };
pm.run_xilinx_dsp(f);
// Look for ability to convert C input from another DSP into PCIN
// NB: Needs to be done after pattern matcher has folded all
// $add cells into the DSP
for (auto cell : module->cells()) {
if (cell->type != "\\DSP48E1")
continue;
SigSpec &opmode = cell->connections_.at("\\OPMODE");
if (opmode.extract(4,3) != Const::from_string("011"))
continue;
SigSpec C = pm.sigmap(cell->getPort("\\C"));
if (C.has_const())
continue;
auto it = bit_to_driver.find(C[0]);
if (it == bit_to_driver.end())
continue;
auto driver = it->second;
// Unextend C
int i;
for (i = GetSize(C)-1; i > 0; i--)
if (C[i] != C[i-1])
break;
if (i > 48-17)
continue;
if (driver->getPort("\\P").extract(17, i) == C.extract(0, i)) {
cell->setPort("\\C", Const(0, 48));
Wire *cascade = module->addWire(NEW_ID, 48);
driver->setPort("\\PCOUT", cascade);
cell->setPort("\\PCIN", cascade);
opmode[6] = State::S1;
opmode[5] = State::S0;
opmode[4] = State::S1;
bit_to_driver.erase(it);
}
}
}
}
} XilinxDspPass;