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Fix signed shift right optimization, bug715.

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This commit is contained in:
Wilson Snyder
2014-03-09 21:28:28 -04:00
parent 334e0e1ca6
commit 9e76078939
4 changed files with 22 additions and 10 deletions
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src/V3Const.cpp
+3 -1
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@@ -538,6 +538,8 @@ private:
void replaceWChild(AstNode* nodep, AstNode* childp) {
// NODE(..., CHILD(...)) -> CHILD(...)
childp->unlinkFrBackWithNext();
// If replacing a SEL for example, the data type comes from the parent (is less wide).
// This may adversly affect the operation of the node being replaced.
childp->dtypeFrom(nodep);
nodep->replaceWith(childp);
nodep->deleteTree(); nodep=NULL;
@@ -1831,7 +1833,7 @@ private:
TREEOP1("AstGte {$lhsp.isAllOnes, $rhsp, $lhsp->width()==$rhsp->width()}", "replaceNumLimited(nodep,1)");
// Two level bubble pushing
TREEOP ("AstNot {$lhsp.castNot, $lhsp->width()==$lhsp->castNot()->lhsp()->width()}", "replaceWChild(nodep, $lhsp->op1p())"); // NOT(NOT(x))->x
TREEOP ("AstLogNot{$lhsp.castLogNot}", "replaceWChild(nodep, $lhsp->op1p())"); // NOT(NOT(x))->x
TREEOP ("AstLogNot{$lhsp.castLogNot}", "replaceWChild(nodep, $lhsp->op1p())"); // LOGNOT(LOGNOT(x))->x
TREEOPV("AstNot {$lhsp.castEqCase, $lhsp.width1}","AstNeqCase{$lhsp->op1p(),$lhsp->op2p()}");
TREEOP ("AstLogNot{$lhsp.castEqCase}", "AstNeqCase{$lhsp->op1p(),$lhsp->op2p()}");
TREEOPV("AstNot {$lhsp.castNeqCase, $lhsp.width1}","AstEqCase {$lhsp->op1p(),$lhsp->op2p()}");