github/verilator
1
0
Fork 1
mirror of https://github.com/verilator/verilator.git synced 2025-04-21 12:06:55 +00:00
Code Issues Packages Projects Releases Wiki Activity

Internals: Separate pure from branching. No functional change.

Browse Source
This commit is contained in:
Wilson Snyder 2011-12-15 22:23:11 -05:00
parent 4da9b5e491
commit 76232cd9e7
4 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/V3Ast.h
View File

@ -968,6 +968,7 @@ public:
// METHODS - queries
virtual bool isPure() const { return true; } // Else a $display, etc, that must be ordered with other displays
virtual bool isBrancher() const { return false; } // Changes control flow, disable some optimizations
virtual bool isGateOptimizable() const { return true; } // Else a AstTime etc that can't be pushed out
virtual bool isSubstOptimizable() const { return true; } // Else a AstTime etc that can't be substituted out
virtual bool isPredictOptimizable() const { return true; } // Else a AstTime etc which output can't be predicted from input

10
src/V3AstNodes.h
View File

@ -2040,7 +2040,7 @@ struct AstBreak : public AstNodeStmt {
ASTNODE_NODE_FUNCS(Break, BREAK)
virtual string verilogKwd() const { return "break"; };
virtual V3Hash sameHash() const { return V3Hash(); }
virtual bool isPure() const { return false; } // SPECIAL: We don't process code after breaks
virtual bool isBrancher() const { return true; } // SPECIAL: We don't process code after breaks
};
struct AstContinue : public AstNodeStmt {
@ -2049,7 +2049,7 @@ struct AstContinue : public AstNodeStmt {
ASTNODE_NODE_FUNCS(Continue, CONTINUE)
virtual string verilogKwd() const { return "continue"; };
virtual V3Hash sameHash() const { return V3Hash(); }
virtual bool isPure() const { return false; } // SPECIAL: We don't process code after breaks
virtual bool isBrancher() const { return true; } // SPECIAL: We don't process code after breaks
};
struct AstDisable : public AstNodeStmt {
@ -2061,7 +2061,7 @@ public:
ASTNODE_NODE_FUNCS(Disable, DISABLE)
virtual string name() const { return m_name; } // * = Block name
void name(const string& flag) { m_name=flag; }
virtual bool isPure() const { return false; } // SPECIAL: We don't process code after breaks
virtual bool isBrancher() const { return true; } // SPECIAL: We don't process code after breaks
};
struct AstReturn : public AstNodeStmt {
@ -2073,7 +2073,7 @@ struct AstReturn : public AstNodeStmt {
virtual string verilogKwd() const { return "return"; };
virtual V3Hash sameHash() const { return V3Hash(); }
AstNode* lhsp() const { return op1p(); }
virtual bool isPure() const { return false; } // SPECIAL: We don't process code after breaks
virtual bool isBrancher() const { return true; } // SPECIAL: We don't process code after breaks
};
struct AstGenIf : public AstNodeIf {
@ -2145,7 +2145,7 @@ public:
virtual bool same(AstNode* samep) const { // Also same if identical tree structure all the way down, but hard to detect
return labelp()==samep->castJumpGo()->labelp(); }
virtual bool isGateOptimizable() const { return false; }
virtual bool isPure() const { return false; } // SPECIAL: We don't process code after breaks
virtual bool isBrancher() const { return true; } // SPECIAL: We don't process code after breaks
AstJumpLabel* labelp() const { return m_labelp; }
};

2
src/V3ClkGater.cpp
View File

@ -862,7 +862,7 @@ class GaterVisitor : public GaterBaseVisitor {
m_stmtVscp = NULL;
m_stmtInPli = false;
}
if (!nodep->isPure()) {
if (!nodep->isPure() || nodep->isBrancher()) {
// May also be a new statement (above if); if so we mark it immediately
UINFO(9," NotPure "<<nodep<<endl);
scoreboardPli(nodep);

3
src/V3Gate.cpp
View File

@ -195,7 +195,8 @@ private:
// *** Special iterator
if (!m_isSimple) return; // Fastpath
if (!nodep->isGateOptimizable()
|| !nodep->isPure()) {
|| !nodep->isPure()
|| nodep->isBrancher()) {
UINFO(5, "Non optimizable type: "<<nodep<<endl);
clearSimple("Non optimizable type");
}