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| author | Clifford Wolf <clifford@clifford.at> | 2019-05-20 15:36:13 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2019-05-20 15:36:13 +0200 |
| commit | c4b8575f4322f72dd1b35e2737966db731a26c17 (patch) | |
| tree | c025620e082f78459cc9a14c07804c82aae800e2 /passes/opt/wreduce.cc | |
| parent | c907899422884d959632ed42c6589a0720b681e4 (diff) | |
| download | yosys-c4b8575f4322f72dd1b35e2737966db731a26c17.tar.gz yosys-c4b8575f4322f72dd1b35e2737966db731a26c17.tar.bz2 yosys-c4b8575f4322f72dd1b35e2737966db731a26c17.zip | |
Add "wreduce -keepdc", fixes #1016
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'passes/opt/wreduce.cc')
| -rw-r--r-- | passes/opt/wreduce.cc | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/passes/opt/wreduce.cc b/passes/opt/wreduce.cc index 58c6e4b4b..1fbc41082 100644 --- a/passes/opt/wreduce.cc +++ b/passes/opt/wreduce.cc @@ -29,6 +29,7 @@ PRIVATE_NAMESPACE_BEGIN struct WreduceConfig { pool<IdString> supported_cell_types; + bool keepdc = false; WreduceConfig() { @@ -82,7 +83,7 @@ struct WreduceWorker SigBit ref = sig_a[i]; for (int k = 0; k < GetSize(sig_s); k++) { - if (ref != Sx && sig_b[k*GetSize(sig_a) + i] != Sx && ref != sig_b[k*GetSize(sig_a) + i]) + if ((config->keepdc || (ref != Sx && sig_b[k*GetSize(sig_a) + i] != Sx)) && ref != sig_b[k*GetSize(sig_a) + i]) goto no_match_ab; if (sig_b[k*GetSize(sig_a) + i] != Sx) ref = sig_b[k*GetSize(sig_a) + i]; @@ -495,6 +496,9 @@ struct WreducePass : public Pass { log(" Do not change the width of memory address ports. Use this options in\n"); log(" flows that use the 'memory_memx' pass.\n"); log("\n"); + log(" -keepdc\n"); + log(" Do not optimize explicit don't-care values.\n"); + log("\n"); } void execute(std::vector<std::string> args, Design *design) YS_OVERRIDE { @@ -509,6 +513,10 @@ struct WreducePass : public Pass { opt_memx = true; continue; } + if (args[argidx] == "-keepdc") { + config.keepdc = true; + continue; + } break; } extra_args(args, argidx, design); |