6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-21 02:24:22 +00:00
Code Issues Projects Releases Wiki Activity

[PHITransAddr] Don't translate unreachable values

Browse Source 
Unreachable values may use themselves in strange ways due to their
dominance property.  Attempting to translate through them can lead to
infinite recursion, crashing LLVM.  Instead, claim that we weren't able
to translate the value.

This fixes PR23096.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238702 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2015-06-01 00:15:08 +00:00
parent 5a13050628
commit 75ce6bba4e
4 changed files with 46 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
lib/Analysis/MemoryDependenceAnalysis.cpp
View File

@ -1278,8 +1278,7 @@ getNonLocalPointerDepFromBB(Instruction *QueryInst,
// Get the PHI translated pointer in this predecessor. This can fail if
// not translatable, in which case the getAddr() returns null.
PHITransAddr &PredPointer = PredList.back().second;
PredPointer.PHITranslateValue(BB, Pred, nullptr);
PredPointer.PHITranslateValue(BB, Pred, DT, /*MustDominate=*/false);
Value *PredPtrVal = PredPointer.getAddr();
// Check to see if we have already visited this pred block with another