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[APInt] Implement tcDecrement as a counterpart to tcIncrement. This is for use in APFloat IEEE-754R 2008 nextUp/nextDown function.

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rdar://13852078

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182801 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman
2013-05-28 19:50:20 +00:00
parent e274b476de
commit a32edcfbc5
3 changed files with 82 additions and 0 deletions
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14
lib/Support/APInt.cpp
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@ -2888,6 +2888,20 @@ APInt::tcIncrement(integerPart *dst, unsigned int parts)
return i == parts;
}
/* Decrement a bignum in-place, return the borrow flag. */
integerPart
APInt::tcDecrement(integerPart *dst, unsigned int parts) {
for (unsigned int i = 0; i < parts; i++) {
// If the current word is non-zero, then the decrement has no effect on the
// higher-order words of the integer and no borrow can occur. Exit early.
if (dst[i]--)
return 0;
}
// If every word was zero, then there is a borrow.
return 1;
}
/* Set the least significant BITS bits of a bignum, clear the
rest. */
void