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Add MergeCond pass to combine assignments with ?: on rhs (#2376)

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This provides minor simulation performance benefit, but can provide
large C++ compilation time improvement, notably with Clang (4x).

This patch implements #2366 .
This commit is contained in:
Geza Lore
2020-05-30 21:09:05 +01:00
committed by GitHub
parent 18870f8b62
commit fe306a36b8
8 changed files with 622 additions and 14 deletions
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src/V3Options.cpp
+5 -3
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@@ -917,12 +917,12 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
case 'b': m_oCombine = flag; break;
case 'c': m_oConst = flag; break;
case 'd': m_oDedupe = flag; break;
case 'm': m_oAssemble = flag; break;
case 'e': m_oCase = flag; break;
case 'g': m_oGate = flag; break;
case 'i': m_oInline = flag; break;
case 'k': m_oSubstConst = flag; break;
case 'l': m_oLife = flag; break;
case 'm': m_oAssemble = flag; break;
case 'p':
m_public = !flag;
break; // With -Op so flag=0, we want public on so few optimizations done
@@ -931,6 +931,7 @@ void V3Options::parseOptsList(FileLine* fl, const string& optdir, int argc, char
case 't': m_oLifePost = flag; break;
case 'u': m_oSubst = flag; break;
case 'v': m_oReloop = flag; break;
case 'w': m_oMergeCond = flag; break;
case 'x': m_oExpand = flag; break;
case 'y': m_oAcycSimp = flag; break;
case 'z': m_oLocalize = flag; break;
@@ -1706,23 +1707,24 @@ void V3Options::optimize(int level) {
// Set all optimizations to on/off
bool flag = level > 0;
m_oAcycSimp = flag;
m_oAssemble = flag;
m_oCase = flag;
m_oCombine = flag;
m_oConst = flag;
m_oDedupe = flag;
m_oExpand = flag;
m_oGate = flag;
m_oInline = flag;
m_oLife = flag;
m_oLifePost = flag;
m_oLocalize = flag;
m_oMergeCond = flag;
m_oReloop = flag;
m_oReorder = flag;
m_oSplit = flag;
m_oSubst = flag;
m_oSubstConst = flag;
m_oTable = flag;
m_oDedupe = flag;
m_oAssemble = flag;
// And set specific optimization levels
if (level >= 3) {
m_inlineMult = -1; // Maximum inlining