[RS4GC] Fix rematerialization of bitcast of bitcast.
Summary:
Previously, only the outer (last) bitcast was rematerialized, resulting in a
use of the unrelocated inner (first) bitcast after the statepoint. See the
test case for an example.
Reviewers: igor-laevsky, reames
Subscribers: reames, alex, llvm-commits, sanjoy
Differential Revision: http://reviews.llvm.org/D15789
llvm-svn: 256520
diff --git a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
index a077ba0..a9dc8d8e 100644
--- a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
+++ b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
@@ -2101,16 +2101,12 @@
}
if (CastInst *CI = dyn_cast<CastInst>(CurrentValue)) {
- Value *Def = CI->stripPointerCasts();
-
- // This two checks are basically similar. First one is here for the
- // consistency with findBasePointers logic.
- assert(!isa<CastInst>(Def) && "not a pointer cast found");
if (!CI->isNoopCast(CI->getModule()->getDataLayout()))
return false;
ChainToBase.push_back(CI);
- return findRematerializableChainToBasePointer(ChainToBase, Def, BaseValue);
+ return findRematerializableChainToBasePointer(ChainToBase,
+ CI->getOperand(0), BaseValue);
}
// Not supported instruction in the chain