diff options
Diffstat (limited to 'frontends')
| -rw-r--r-- | frontends/ast/genrtlil.cc | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/frontends/ast/genrtlil.cc b/frontends/ast/genrtlil.cc index ca61cb39b..b4115f0cd 100644 --- a/frontends/ast/genrtlil.cc +++ b/frontends/ast/genrtlil.cc @@ -866,6 +866,9 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint) RTLIL::Wire *wire = NULL; RTLIL::SigChunk chunk; + int add_undef_bits_msb = 0; + int add_undef_bits_lsb = 0; + if (id2ast && id2ast->type == AST_AUTOWIRE && current_module->wires_.count(str) == 0) { RTLIL::Wire *wire = current_module->addWire(str); wire->attributes["\\src"] = stringf("%s:%d", filename.c_str(), linenum); @@ -919,17 +922,40 @@ RTLIL::SigSpec AstNode::genRTLIL(int width_hint, bool sign_hint) delete fake_ast; return sig; } else { - if (children[0]->range_left > id2ast->range_left || id2ast->range_right > children[0]->range_right) - log_error("Range select out of bounds on signal `%s' at %s:%d!\n", - str.c_str(), filename.c_str(), linenum); + int source_width = id2ast->range_left - id2ast->range_right + 1; chunk.width = children[0]->range_left - children[0]->range_right + 1; chunk.offset = children[0]->range_right - id2ast->range_right; if (id2ast->range_swapped) - chunk.offset = wire->width - (chunk.offset + chunk.width); + chunk.offset = (id2ast->range_left - id2ast->range_right + 1) - (chunk.offset + chunk.width); + if (chunk.offset >= source_width || chunk.offset + chunk.width < 0) { + if (chunk.width == 1) + log("Warning: Range select out of bounds on signal `%s' at %s:%d: Setting result bit to undef.\n", + str.c_str(), filename.c_str(), linenum); + else + log("Warning: Range select out of bounds on signal `%s' at %s:%d: Setting all %d result bits to undef.\n", + str.c_str(), filename.c_str(), linenum, chunk.width); + chunk = RTLIL::SigChunk(RTLIL::State::Sx, chunk.width); + } else { + if (chunk.width + chunk.offset > source_width) { + add_undef_bits_msb = (chunk.width + chunk.offset) - source_width; + chunk.width -= add_undef_bits_msb; + } + if (chunk.offset < 0) { + add_undef_bits_lsb = -chunk.offset; + chunk.width -= add_undef_bits_lsb; + chunk.offset += add_undef_bits_lsb; + } + if (add_undef_bits_lsb) + log("Warning: Range select out of bounds on signal `%s' at %s:%d: Setting %d LSB bits to undef.\n", + str.c_str(), filename.c_str(), linenum, add_undef_bits_lsb); + if (add_undef_bits_msb) + log("Warning: Range select out of bounds on signal `%s' at %s:%d: Setting %d MSB bits to undef.\n", + str.c_str(), filename.c_str(), linenum, add_undef_bits_msb); + } } } - RTLIL::SigSpec sig(chunk); + RTLIL::SigSpec sig = { RTLIL::SigSpec(RTLIL::State::Sx, add_undef_bits_msb), chunk, RTLIL::SigSpec(RTLIL::State::Sx, add_undef_bits_lsb) }; if (genRTLIL_subst_from && genRTLIL_subst_to) sig.replace(*genRTLIL_subst_from, *genRTLIL_subst_to); |