6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-15 05:24:01 +00:00
Code Issues Projects Releases Wiki Activity

APInt's countLeadingOnes() was broken for negative i128 values,

Browse Source 
causing assertion failures in getSExtValue().
Fix it by making highWordBits actually contain what its name says,
and add some more unit-tests for APInt.
This fixes PR3419.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63107 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin
2009-01-27 18:06:03 +00:00
parent 101a90f3d3
commit 2d0f1c57c3
2 changed files with 84 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Support/APInt.cpp
View File

@ -683,7 +683,13 @@ unsigned APInt::countLeadingOnes() const {
return countLeadingOnes_64(VAL, APINT_BITS_PER_WORD - BitWidth);
unsigned highWordBits = BitWidth % APINT_BITS_PER_WORD;
unsigned shift = (highWordBits == 0 ? 0 : APINT_BITS_PER_WORD - highWordBits);
unsigned shift;
if (!highWordBits) {
highWordBits = APINT_BITS_PER_WORD;
shift = 0;
} else {
shift = APINT_BITS_PER_WORD - highWordBits;
}
int i = getNumWords() - 1;
unsigned Count = countLeadingOnes_64(pVal[i], shift);
if (Count == highWordBits) {