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Internals: Shrink AstSelPlus code. No functional change.

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This commit is contained in:
Wilson Snyder 2014-03-08 14:15:29 -05:00
parent 85d790ff79
commit 8a8aab1aae
1 changed files with 8 additions and 17 deletions
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25
src/V3WidthSel.cpp
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@ -390,40 +390,31 @@ private:
if (ddtypep->castBasicDType()
|| (ddtypep->castNodeClassDType()
&& ddtypep->castNodeClassDType()->packedUnsup())) {
AstSel* newp = NULL;
AstNode* newlsbp = NULL;
if (nodep->castSelPlus()) {
if (fromRange.littleEndian()) {
// SELPLUS(from,lsb,width) -> SEL(from, (vector_msb-width+1)-sel, width)
newp = new AstSel (nodep->fileline(),
fromp,
newSubNeg((fromRange.hi()-width+1), rhsp),
widthp);
newlsbp = newSubNeg((fromRange.hi()-width+1), rhsp);
} else {
// SELPLUS(from,lsb,width) -> SEL(from, lsb-vector_lsb, width)
newp = new AstSel (nodep->fileline(),
fromp,
newSubNeg(rhsp, fromRange.lo()),
widthp);
newlsbp = newSubNeg(rhsp, fromRange.lo());
}
} else if (nodep->castSelMinus()) {
if (fromRange.littleEndian()) {
// SELMINUS(from,msb,width) -> SEL(from, msb-[bit])
newp = new AstSel (nodep->fileline(),
fromp,
newSubNeg(fromRange.hi(), rhsp),
widthp);
newlsbp = newSubNeg(fromRange.hi(), rhsp);
} else {
// SELMINUS(from,msb,width) -> SEL(from, msb-(width-1)-lsb#)
newp = new AstSel (nodep->fileline(),
fromp,
newSubNeg(rhsp, fromRange.lo()+(width-1)),
widthp);
newlsbp = newSubNeg(rhsp, fromRange.lo()+(width-1));
}
} else {
nodep->v3fatalSrc("Bad Case");
}
AstSel* newp = new AstSel (nodep->fileline(),
fromp, newlsbp, widthp);
newp->declRange(fromRange);
UINFO(6," new "<<newp<<endl);
if (debug()>=9) newp->dumpTree(cout,"--SELNEW: ");
nodep->replaceWith(newp); pushDeletep(nodep); nodep=NULL;
}
else { // NULL=bad extract, or unknown node type