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Add "pmux2shiftx -norange", fixes #1135 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-06-27 10:59:12 +02:00
parent 0d2b87e3ed
commit 7c14678ec0
2 changed files with 12 additions and 3 deletions
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1
CHANGELOG
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@ -21,6 +21,7 @@ Yosys 0.8 .. Yosys 0.8-dev
- Added "muxcover -dmux=<cost>"
- Added "muxcover -nopartial"
- Added "muxpack" pass
- Added "pmux2shiftx -norange"
- "synth_xilinx" to now infer hard shift registers, using new "shregmap -tech xilinx"
- Fixed sign extension of unsized constants with 'bx and 'bz MSB

14
passes/opt/pmux2shiftx.cc
View File

@ -221,6 +221,9 @@ struct Pmux2ShiftxPass : public Pass {
log(" select strategy for one-hot encoded control signals\n");
log(" default: pmux\n");
log("\n");
log(" -norange\n");
log(" disable $sub inference for \"range decoders\"\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
@ -230,6 +233,7 @@ struct Pmux2ShiftxPass : public Pass {
bool optimize_onehot = true;
bool verbose = false;
bool verbose_onehot = false;
bool norange = false;
log_header(design, "Executing PMUX2SHIFTX pass.\n");
@ -270,6 +274,10 @@ struct Pmux2ShiftxPass : public Pass {
verbose_onehot = true;
continue;
}
if (args[argidx] == "-norange") {
norange = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -559,7 +567,7 @@ struct Pmux2ShiftxPass : public Pass {
int this_inv_delta = this_maxval - this_minval;
bool this_inv = false;
if (this_delta != this_inv_delta)
if (!norange && this_delta != this_inv_delta)
this_inv = this_inv_delta < this_delta;
else if (this_maxval != this_inv_maxval)
this_inv = this_inv_maxval < this_maxval;
@ -574,7 +582,7 @@ struct Pmux2ShiftxPass : public Pass {
if (best_src_col < 0)
this_is_better = true;
else if (this_delta != best_delta)
else if (!norange && this_delta != best_delta)
this_is_better = this_delta < best_delta;
else if (this_maxval != best_maxval)
this_is_better = this_maxval < best_maxval;
@ -656,7 +664,7 @@ struct Pmux2ShiftxPass : public Pass {
// check density percentages
Const offset(State::S0, GetSize(sig));
if (absolute_density < min_density && range_density >= min_density)
if (!norange && absolute_density < min_density && range_density >= min_density)
{
offset = Const(min_choice, GetSize(sig));
log(" offset: %s\n", log_signal(offset));