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Fix shift with XOR mis-optimization, bug776.

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Wilson Snyder
2014-05-26 18:16:52 -04:00
parent f705f9b275
commit 5f8f474c0c
3 changed files with 8 additions and 2 deletions
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src/V3Const.cpp
+1 -1
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@@ -2070,7 +2070,7 @@ private:
TREEOP ("AstAnd {operandShiftSame(nodep)}", "replaceShiftSame(nodep)");
TREEOP ("AstOr {operandShiftSame(nodep)}", "replaceShiftSame(nodep)");
TREEOP ("AstXor {operandShiftSame(nodep)}", "replaceShiftSame(nodep)");
TREEOP ("AstXnor{operandShiftSame(nodep)}", "replaceShiftSame(nodep)");
// "AstXnor{operandShiftSame(nodep)}", // Cannot ShiftSame as the shifted-in zeros might create a one
// Note can't simplify a extend{extends}, extends{extend}, as the sign bits end up in the wrong places
TREEOPV("AstExtend {$lhsp.castExtend}", "replaceExtend(nodep, nodep->lhsp()->castExtend()->lhsp())");
TREEOPV("AstExtendS{$lhsp.castExtendS}", "replaceExtend(nodep, nodep->lhsp()->castExtendS()->lhsp())");