If a function does a volatile load from a global constant, do not
consider it to be readonly. In fact, don't even consider it to be
readonly if it does a volatile load from an AllocaInst either (it
is debatable as to whether readonly would be correct or not in this
case; play safe for the moment). This fixes PR8279.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117783 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/FunctionAttrs.cpp b/lib/Transforms/IPO/FunctionAttrs.cpp
index d4bce9e..39f48145 100644
--- a/lib/Transforms/IPO/FunctionAttrs.cpp
+++ b/lib/Transforms/IPO/FunctionAttrs.cpp
@@ -188,12 +188,12 @@
continue;
}
} else if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
- // Ignore loads from local memory.
- if (PointsToLocalMemory(LI->getPointerOperand()))
+ // Ignore non-volatile loads from local memory.
+ if (!LI->isVolatile() && PointsToLocalMemory(LI->getPointerOperand()))
continue;
} else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
- // Ignore stores to local memory.
- if (PointsToLocalMemory(SI->getPointerOperand()))
+ // Ignore non-volatile stores to local memory.
+ if (!SI->isVolatile() && PointsToLocalMemory(SI->getPointerOperand()))
continue;
}