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| author | Meador Inge <meadori@codesourcery.com> | 2013-02-07 18:36:50 +0000 |
|---|---|---|
| committer | Meador Inge <meadori@codesourcery.com> | 2013-02-07 18:36:50 +0000 |
| commit | 35b1423ee67a6ec7052016dda486e6ee4a118db4 (patch) | |
| tree | de4008f97ca37a551caff7463b7fb6c9ad87121a /include/llvm/ADT/APInt.h | |
| parent | def0c1f756562601829364e3fca4bd1f0407316e (diff) | |
| download | external_llvm-35b1423ee67a6ec7052016dda486e6ee4a118db4.zip external_llvm-35b1423ee67a6ec7052016dda486e6ee4a118db4.tar.gz external_llvm-35b1423ee67a6ec7052016dda486e6ee4a118db4.tar.bz2 | |
ADT: Correct APInt::getActiveWords for zero values
PR15138 was opened because of a segfault in the Bitcode writer.
The actual issue ended up being a bug in APInt where calls to
APInt::getActiveWords returns a bogus value when the APInt value
is 0. This patch fixes the problem by ensuring that getActiveWords
returns 1 for 0 valued APInts.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174641 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/ADT/APInt.h')
| -rw-r--r-- | include/llvm/ADT/APInt.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h index e67e032..2e623a1 100644 --- a/include/llvm/ADT/APInt.h +++ b/include/llvm/ADT/APInt.h @@ -1191,7 +1191,8 @@ public: /// APInt. This is used in conjunction with getActiveData to extract the raw /// value of the APInt. unsigned getActiveWords() const { - return whichWord(getActiveBits()-1) + 1; + unsigned numActiveBits = getActiveBits(); + return numActiveBits ? whichWord(numActiveBits - 1) + 1 : 1; } /// Computes the minimum bit width for this APInt while considering it to be |