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-rw-r--r--lib/Transforms/Scalar/InstructionCombining.cpp14
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 462824d1f8..f4edc4cb50 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3071,6 +3071,20 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
return new SelectInst(SI->getCondition(), V1, V2);
}
+ // load (select (cond, null, P)) -> load P
+ if (Constant *C = dyn_cast<Constant>(SI->getOperand(1)))
+ if (C->isNullValue()) {
+ LI.setOperand(0, SI->getOperand(2));
+ return &LI;
+ }
+
+ // load (select (cond, P, null)) -> load P
+ if (Constant *C = dyn_cast<Constant>(SI->getOperand(2)))
+ if (C->isNullValue()) {
+ LI.setOperand(0, SI->getOperand(1));
+ return &LI;
+ }
+
} else if (PHINode *PN = dyn_cast<PHINode>(Op)) {
// load (phi (&V1, &V2, &V3)) --> phi(load &V1, load &V2, load &V3)
bool Safe = PN->getParent() == LI.getParent();