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| author | Clifford Wolf <clifford@clifford.at> | 2013-12-04 21:19:54 +0100 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2013-12-04 21:19:54 +0100 |
| commit | 3c220e0b3271af2505f45c9828d878a492831174 (patch) | |
| tree | c73b023725bcbb42e42fbf2a9117b7be53dbb9f5 /frontends/ast | |
| parent | 4a4a3fc3377243d85100b829a0f6b785376cce9f (diff) | |
| download | yosys-3c220e0b3271af2505f45c9828d878a492831174.tar.gz yosys-3c220e0b3271af2505f45c9828d878a492831174.tar.bz2 yosys-3c220e0b3271af2505f45c9828d878a492831174.zip | |
Added support for $clog2 system function
Diffstat (limited to 'frontends/ast')
| -rw-r--r-- | frontends/ast/simplify.cc | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/frontends/ast/simplify.cc b/frontends/ast/simplify.cc index ae2f0caae..94b588f25 100644 --- a/frontends/ast/simplify.cc +++ b/frontends/ast/simplify.cc @@ -1052,11 +1052,27 @@ skip_dynamic_range_lvalue_expansion:; // replace function and task calls with the code from the function or task if ((type == AST_FCALL || type == AST_TCALL) && !str.empty()) { - if (type == AST_FCALL) { - if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION) { - current_ast_mod->dumpAst(stderr, "> "); - log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum); + if (type == AST_FCALL) + { + if (str == "\\$clog2") + { + AstNode *buf = children[0]->clone(); + while (buf->simplify(true, false, false, stage, width_hint, sign_hint)) { } + if (!buf->type == AST_CONSTANT) + log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum); + + RTLIL::Const arg_value = buf->bitsAsConst(); + uint32_t result = 0; + for (size_t i = 0; i < arg_value.bits.size(); i++) + if (arg_value.bits.at(i) == RTLIL::State::S1) + result = i; + + newNode = mkconst_int(result, false); + goto apply_newNode; } + + if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION) + log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum); } if (type == AST_TCALL) { if (current_scope.count(str) == 0 || current_scope[str]->type != AST_TASK) |