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Fix $clog2 calculation error with powers-of-2, bug81.

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This commit is contained in:
Wilson Snyder
2009-05-01 22:18:32 -04:00
parent 9b9e4e5a3f
commit 2c953dc37f
5 changed files with 59 additions and 46 deletions
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src/V3Number.cpp
+4 -3
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@@ -675,10 +675,11 @@ V3Number& V3Number::opOneHot0 (const V3Number& lhs) {
}
V3Number& V3Number::opCLog2 (const V3Number& lhs) {
if (lhs.isFourState()) return setAllBitsX();
int bit;
for (bit=lhs.width()-1; bit>=0; bit--) {
// IE if 4, this algorithm didn't pre-subtract 1, so we need to post-correct now
int adjust = (lhs.countOnes()==1) ? 0 : 1;
for (int bit=lhs.width()-1; bit>=0; bit--) {
if (lhs.bitIs1(bit)) {
setLong(bit+1);
setLong(bit+adjust);
return *this;
}
}