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Fix shift to remove operation side effects (#4563).

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Wilson Snyder
2023-10-14 22:34:37 -04:00
parent 3940a214d0
commit 46f8a659b3
9 changed files with 206 additions and 61 deletions
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src/V3Const.cpp
+16 -8
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@@ -3391,9 +3391,12 @@ private:
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)");
TREEOP ("AstShiftRS{$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftL {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftLOvr {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftR {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftROvr {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftRS {$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstShiftRSOvr{$lhsp.isZero, $rhsp}", "replaceZeroChkPure(nodep,$rhsp)");
TREEOP ("AstXor {$lhsp.isZero, $rhsp}", "replaceWRhs(nodep)");
TREEOP ("AstSub {$lhsp.isZero, $rhsp}", "AstNegate{$rhsp}");
TREEOP ("AstAdd {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
@@ -3403,9 +3406,12 @@ private:
TREEOP ("AstMul {$lhsp, $rhsp.isZero}", "replaceZeroChkPure(nodep,$lhsp)");
TREEOP ("AstMulS {$lhsp, $rhsp.isZero}", "replaceZeroChkPure(nodep,$lhsp)");
TREEOP ("AstOr {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftL{$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftR{$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftRS{$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftL {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftLOvr {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftR {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftROvr {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftRS {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstShiftRSOvr{$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstSub {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
TREEOP ("AstXor {$lhsp, $rhsp.isZero}", "replaceWLhs(nodep)");
// Non-zero on one side or the other
@@ -3500,8 +3506,10 @@ private:
TREEOPV("AstNot {$lhsp.castGteS, $lhsp.width1}", "AstLtS {$lhsp->castGteS()->lhsp(),$lhsp->castGteS()->rhsp()}");
TREEOP ("AstLogNot{$lhsp.castGteS}", "AstLtS {$lhsp->castGteS()->lhsp(),$lhsp->castGteS()->rhsp()}");
// Not common, but avoids compiler warnings about over shifting
TREEOP ("AstShiftL{operandHugeShiftL(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftR{operandHugeShiftR(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftL {operandHugeShiftL(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftLOvr{operandHugeShiftL(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftR {operandHugeShiftR(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftROvr{operandHugeShiftR(nodep)}", "replaceZero(nodep)");
TREEOP ("AstShiftL{operandShiftOp(nodep)}", "replaceShiftOp(nodep)");
TREEOP ("AstShiftR{operandShiftOp(nodep)}", "replaceShiftOp(nodep)");
TREEOP ("AstShiftL{operandShiftShift(nodep)}", "replaceShiftShift(nodep)");