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clk skew 0.0 for degenerate case with no launch/capture 

Signed-off-by: James Cherry <cherry@parallaxsw.com>
This commit is contained in:
James Cherry 2022-09-23 09:13:27 -07:00
parent 38add49d7f
commit 18f11a3029
1 changed files with 12 additions and 7 deletions
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19
search/ClkSkew.cc
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@ -172,16 +172,21 @@ ClkSkews::findWorstClkSkew(const Corner *corner,
ClockSet clks;
for (Clock *clk : *sdc_->clocks())
clks.insert(clk);
float worst_skew = 0.0;
ClkSkewMap skews;
findClkSkew(&clks, corner, setup_hold, skews);
for (auto clk_skew_itr : skews) {
ClkSkew *clk_skew = clk_skew_itr.second;
float skew = clk_skew->skew();
if (skew < worst_skew)
worst_skew = skew;
if (!skews.empty()) {
float worst_skew = INF;
for (auto clk_skew_itr : skews) {
ClkSkew *clk_skew = clk_skew_itr.second;
float skew = clk_skew->skew();
if (skew < worst_skew)
worst_skew = skew;
}
return worst_skew;
}
return worst_skew;
else
// Degenerate design without launch/capture registers.
return 0.0;
}
void