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44 lines
1.7 KiB
Text
44 lines
1.7 KiB
Text
# Regression test: `stat` must account for the area of blackbox cells whose
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# area comes from the module's `area` attribute (rather than from a `-liberty`
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# file passed to `stat` itself).
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#
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# Both the `read_liberty` (-lib) and `read_liberty2json` frontends attach the
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# cell area to the blackbox module as a STRING attribute:
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# frontends/liberty/liberty.cc: module->attributes[ID::area] = area->value; // raw liberty string, e.g. "1.500000"
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# passes/silimate/l2j_frontend.cc: set_string_attribute(ID(area), std::to_string(area)); // e.g. "1.500000"
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#
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# The blackbox-area branch in stat.cc's hierarchy_builder() previously guarded
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# on `attributes.at(ID::area).size() == 0` and read the value with `.as_int()`.
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# A string-valued area Const has size() != 0, so the branch never ran, and even
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# if it had, `.as_int()` reinterprets the raw bits instead of parsing "1.5".
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# The fix guards on size() != 0 and parses the string area as a double.
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#
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# This test recreates exactly what the frontends produce (a blackbox module
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# with a string `area` attribute) and checks that stat counts it. `-hierarchy`
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# is used because the blackbox-area branch accounts the cell as a submodule,
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# and only the hierarchical view reports submodule area.
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read_rtlil << EOT
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attribute \blackbox 1
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attribute \area "1.500000"
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module \blackbox_cell
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wire input 1 \A
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wire output 2 \Y
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end
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module \top
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wire input 1 \A
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wire output 2 \Y
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cell \blackbox_cell \inst
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connect \A \A
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connect \Y \Y
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end
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end
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EOT
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# The single blackbox instance has area 1.5, so the top module's hierarchical
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# chip area must be 1.5, reported as one submodule.
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logger -expect log "Chip area for module '\\top': 1.500000" 1
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logger -expect log "1.5.*blackbox_cell" 1
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logger -expect-no-warnings
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stat -hierarchy
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