diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index a02aa5d..1bfce5d 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -10896,6 +10896,13 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) { if (Value *X = getBitCastOperand(PtrOp)) { assert(isa<PointerType>(X->getType()) && "Must be cast from pointer"); + // If the input bitcast is actually "bitcast(bitcast(x))", then we don't + // want to change the gep until the bitcasts are eliminated. + if (getBitCastOperand(X)) { + Worklist.AddValue(PtrOp); + return 0; + } + // Transform: GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ... // into : GEP [10 x i8]* X, i32 0, ... // |