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Fix some bugs in division logic.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34384 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2007-02-17 22:38:07 +00:00
parent aa7976199c
commit c72f28042b
1 changed files with 5 additions and 3 deletions
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lib/Support/APInt.cpp
+5 -3
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@@ -980,7 +980,7 @@ static unsigned subMul(unsigned dest[], unsigned offset,
unsigned carry = 0;
unsigned j = 0;
do {
uint64_t prod = ((uint64_t) x[j] & 0xffffffffL) * yl;
uint64_t prod = ((uint64_t) x[j] & 0xffffffffUL) * yl;
unsigned prod_low = (unsigned) prod;
unsigned prod_high = (unsigned) (prod >> 32);
prod_low += carry;
@@ -1104,7 +1104,8 @@ APInt APInt::udiv(const APInt& RHS) const {
X = APIntOps::shl(Result, nshift);
++lhsWords;
}
div((unsigned*)X.pVal, lhsWords * 2 - 1, (unsigned*)Y.pVal, rhsWords*2);
div((unsigned*)X.pVal, lhsWords * 2 - 1,
(unsigned*)(Y.isSingleWord()? &Y.VAL : Y.pVal), rhsWords*2);
memset(Result.pVal, 0, Result.getNumWords() * 8);
memcpy(Result.pVal, X.pVal + rhsWords, (lhsWords - rhsWords) * 8);
}
@@ -1154,7 +1155,8 @@ APInt APInt::urem(const APInt& RHS) const {
APIntOps::shl(Y, nshift);
APIntOps::shl(X, nshift);
}
div((unsigned*)X.pVal, rhsWords*2-1, (unsigned*)Y.pVal, rhsWords*2);
div((unsigned*)X.pVal, rhsWords*2-1,
(unsigned*)(Y.isSingleWord()? &Y.VAL : Y.pVal), rhsWords*2);
memset(Result.pVal, 0, Result.getNumWords() * 8);
for (unsigned i = 0; i < rhsWords-1; ++i)
Result.pVal[i] = (X.pVal[i] >> nshift) | (X.pVal[i+1] << (64 - nshift));