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Fix power operator calculation, bug730.

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This commit is contained in:
Wilson Snyder
2014-04-05 15:44:49 -04:00
parent b6913ff9b3
commit ff19dd94f9
15 changed files with 347 additions and 74 deletions
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src/V3Const.cpp
+8 -3
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@@ -1794,8 +1794,14 @@ private:
TREEOP ("AstDivS {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstMul {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstMulS {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPow {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPowS {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPow {$rhsp.isZero}", "replaceNum(nodep, 1)"); // Overrides lhs zero rule
TREEOP ("AstPowSS {$rhsp.isZero}", "replaceNum(nodep, 1)"); // Overrides lhs zero rule
TREEOP ("AstPowSU {$rhsp.isZero}", "replaceNum(nodep, 1)"); // Overrides lhs zero rule
TREEOP ("AstPowUS {$rhsp.isZero}", "replaceNum(nodep, 1)"); // Overrides lhs zero rule
TREEOP ("AstPow {$lhsp.isZero, !$rhsp.isZero}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPowSU {$lhsp.isZero, !$rhsp.isZero}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPowUS {$lhsp.isZero, !$rhsp.isZero}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstPowSU {$lhsp.isZero, !$rhsp.isZero}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstOr {$lhsp.isZero, $rhsp}", "replaceWRhs(nodep)");
TREEOP ("AstShiftL{$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftR{$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
@@ -1834,7 +1840,6 @@ private:
TREEOP ("AstMul {operandIsPowTwo($lhsp), $rhsp}", "replaceMulShift(nodep)"); // a*2^n -> a<<n
TREEOP ("AstDiv {$lhsp, operandIsPowTwo($rhsp)}", "replaceDivShift(nodep)"); // a/2^n -> a>>n
TREEOP ("AstPow {operandIsTwo($lhsp), $rhsp}", "replacePowShift(nodep)"); // 2**a == 1<<a
TREEOP ("AstPowS {operandIsTwo($lhsp), $rhsp}", "replacePowShift(nodep)"); // 2**a == 1<<a
// Trinary ops
// Note V3Case::Sel requires Cond to always be conditionally executed in C to prevent core dump!
TREEOP ("AstNodeCond{$condp.isZero, $expr1p, $expr2p}", "replaceWChild(nodep,$expr2p)");