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Do not die if DSP48E1.P has no users (would otherwise get 'clean'-ed)

This commit is contained in:
Eddie Hung 2019-09-25 22:58:03 -07:00
parent cd8a640989
commit f1de93edf5
1 changed files with 5 additions and 1 deletions
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6
passes/pmgen/xilinx_dsp.pmg
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@ -53,6 +53,10 @@ code sigA sigB sigC sigD sigM clock
}
else
sigM = P;
// This sigM could have no users if downstream $add
// is narrower than $mul result, for example
if (sigM.empty())
reject;
clock = port(dsp, \CLK, SigBit());
endcode
@ -261,7 +265,7 @@ endcode
match postAdd
// Ensure that Z mux is not already used
if port(dsp, \OPMODE).extract(4,3).is_fully_zero()
if port(dsp, \OPMODE, SigSpec()).extract(4,3).is_fully_zero()
select postAdd->type.in($add)
select GetSize(port(postAdd, \Y)) <= 48