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Optimize temporary insertion for concatenations in Dfg (#7013)

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Add a new Dfg pass 'pushDownSel'. This will try to move selects through
a tree of concatenations in order to eliminate temporary nodes holding
intermediate concatenation results. This can get rid of a lot of
variables when packed arrays are assigned in parts (e.g. bit-wise).
This commit is contained in:
Geza Lore
2026-02-07 18:06:12 +00:00
committed by GitHub
parent abdac02b50
commit bb0e1c8c61
12 changed files with 548 additions and 0 deletions
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src/V3Options.cpp
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@@ -1464,6 +1464,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc,
});
DECL_OPTION("-fdfg-pre-inline", FOnOff, &m_fDfgPreInline);
DECL_OPTION("-fdfg-post-inline", FOnOff, &m_fDfgPostInline);
DECL_OPTION("-fdfg-push-down-sels", FOnOff, &m_fDfgPushDownSels);
DECL_OPTION("-fdfg-scoped", FOnOff, &m_fDfgScoped);
DECL_OPTION("-fdfg-synthesize-all", FOnOff, &m_fDfgSynthesizeAll);
DECL_OPTION("-fexpand", FOnOff, &m_fExpand);