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	Merge pull request #3396 from jix/async2sync_const_clocks
async2sync: turn FFs with const clks into gclk FFs with feedback
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					 1 changed files with 3 additions and 0 deletions
				
			
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			@ -75,6 +75,9 @@ struct Async2syncPass : public Pass {
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				if (ff.has_gclk)
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					continue;
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				if (ff.has_clk && ff.sig_clk.is_fully_const())
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					ff.has_ce = ff.has_clk = ff.has_srst = false;
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				if (ff.has_clk)
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				{
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					if (ff.has_sr) {
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