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Constify LSB subtractions immediately, no functional change intended

This commit is contained in:
Wilson Snyder 2010-12-26 15:20:57 -05:00
parent 114af7d33f
commit bcd90d3401
1 changed files with 7 additions and 0 deletions
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7
src/V3WidthSel.cpp
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@ -100,6 +100,13 @@ private:
// have to deal with signed math and related 32bit sign extension problems // have to deal with signed math and related 32bit sign extension problems
if (rhs == 0) { if (rhs == 0) {
return lhsp; return lhsp;
} else if (lhsp->castConst()) {
// Optional vs just making add/sub below, but saves constification some work
V3Number num (lhsp->fileline(), lhsp->width());
num.opSub(lhsp->castConst()->num(), V3Number(lhsp->fileline(), 32, rhs));
num.isSigned(lhsp->isSigned());
AstNode* newp = new AstConst(lhsp->fileline(), num);
return newp;
} else if (rhs > 0) { } else if (rhs > 0) {
// We must make sure sub gets sign of original value // We must make sure sub gets sign of original value
AstNode* newp = new AstSub(lhsp->fileline(), lhsp, AstNode* newp = new AstSub(lhsp->fileline(), lhsp,