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Optimize returns at end of functions.

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This commit is contained in:
Wilson Snyder
2019-12-01 17:19:18 -05:00
parent 2076b0219d
commit d65d8fda54
3 changed files with 24 additions and 1 deletions
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src/V3Const.cpp
+14 -1
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@@ -2180,7 +2180,20 @@ private:
virtual void visit(AstJumpGo* nodep) {
iterateChildren(nodep);
m_hasJumpGo = true;
if (m_doExpensive) { nodep->labelp()->user4(true); }
if (m_doExpensive) {
// If last statement in a jump label we have JumpLabel(...., JumpGo)
// Often caused by "return" in a Verilog function. The Go is pointless, remove.
if (!nodep->nextp()) {
if (AstJumpLabel* aboveLabelp = VN_CAST(nodep->abovep(), JumpLabel)) {
if (aboveLabelp == nodep->labelp()) {
UINFO(4, "JUMPGO => last remove "<<nodep<<endl);
nodep->unlinkFrBack()->deleteTree(); VL_DANGLING(nodep);
return;
}
}
}
nodep->labelp()->user4(true);
}
}
virtual void visit(AstJumpLabel* nodep) {