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Fix APInt::rotl and APInt::rotr so that they work correctly. Found while writing some code that tried to use them. 

llvm-svn: 147134
This commit is contained in:
Eli Friedman 2011-12-22 03:15:35 +00:00
parent 1dc45d8df4
commit 2aae94fa70
1 changed files with 4 additions and 12 deletions
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16
llvm/lib/Support/APInt.cpp
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@ -1338,14 +1338,10 @@ APInt APInt::rotl(const APInt &rotateAmt) const {
}
APInt APInt::rotl(unsigned rotateAmt) const {
rotateAmt %= BitWidth;
if (rotateAmt == 0)
return *this;
// Don't get too fancy, just use existing shift/or facilities
APInt hi(*this);
APInt lo(*this);
hi.shl(rotateAmt);
lo.lshr(BitWidth - rotateAmt);
return hi | lo;
return shl(rotateAmt) | lshr(BitWidth - rotateAmt);
}
APInt APInt::rotr(const APInt &rotateAmt) const {
@ -1353,14 +1349,10 @@ APInt APInt::rotr(const APInt &rotateAmt) const {
}
APInt APInt::rotr(unsigned rotateAmt) const {
rotateAmt %= BitWidth;
if (rotateAmt == 0)
return *this;
// Don't get too fancy, just use existing shift/or facilities
APInt hi(*this);
APInt lo(*this);
lo.lshr(rotateAmt);
hi.shl(BitWidth - rotateAmt);
return hi | lo;
return lshr(rotateAmt) | shl(BitWidth - rotateAmt);
}
// Square Root - this method computes and returns the square root of "this".