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tests: use optional ABCEXTERNAL when specified
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Commits 65924fd1, abc40924, and ebe29b66 hard-code the invocation
of yosys-abc, which fails if ABCEXTERNAL was specified during the
build. Allow tests to utilize an optional, externally specified
abc binary.
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
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Optimizing DFFs whose initial value prevents their value from changing
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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clifford/ext1046
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This is a proof of concept implementation that invokes SAT solver via Pass::call
method.
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tests: Check that Icarus can parse arch sim models
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Signed-off-by: David Shah <dave@ds0.me>
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Add "pmux2shiftx -norange"
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memory_dff: walk through more than one mux for computing read enable
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Add support for partial matches to muxcover
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Improve shregmap to handle case where first flop is common to two chains
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Make genvar a signed type
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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towoe-unpacked_arrays
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Allows fixed-sized array dimension specified by a single number.
This commit is based on the work from PeterCrozier
https://github.com/YosysHQ/yosys/pull/560.
But is split out of the original work.
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Improve handling of initial/default values
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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Signed-off-by: Clifford Wolf <clifford@clifford.at>
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elaboration system tasks
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clifford/pr983
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(IEEE1800-2017 section 20.11)
This PR allows us to use $info/$warning/$error/$fatal **at elaboration time** within a generate block.
This is very useful to stop a synthesis of a parametrized block when an
illegal combination of parameters is chosen.
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