Disable DAGCombine's alignment inference in "fast" codegen mode.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55059 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 9682a2f..49b695c 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -51,6 +51,7 @@
SelectionDAG &DAG;
TargetLowering &TLI;
bool AfterLegalize;
+ bool Fast;
// Worklist of all of the nodes that need to be simplified.
std::vector<SDNode*> WorkList;
@@ -237,10 +238,11 @@
SDValue FindBetterChain(SDNode *N, SDValue Chain);
public:
- DAGCombiner(SelectionDAG &D, AliasAnalysis &A)
+ DAGCombiner(SelectionDAG &D, AliasAnalysis &A, bool fast)
: DAG(D),
TLI(D.getTargetLoweringInfo()),
AfterLegalize(false),
+ Fast(fast),
AA(A) {}
/// Run - runs the dag combiner on all nodes in the work list
@@ -4411,7 +4413,7 @@
SDValue Ptr = LD->getBasePtr();
// Try to infer better alignment information than the load already has.
- if (LD->isUnindexed()) {
+ if (!Fast && LD->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > LD->getAlignment())
return DAG.getExtLoad(LD->getExtensionType(), LD->getValueType(0),
@@ -4529,7 +4531,7 @@
SDValue Ptr = ST->getBasePtr();
// Try to infer better alignment information than the store already has.
- if (ST->isUnindexed()) {
+ if (!Fast && ST->isUnindexed()) {
if (unsigned Align = InferAlignment(Ptr, DAG)) {
if (Align > ST->getAlignment())
return DAG.getTruncStore(Chain, Value, Ptr, ST->getSrcValue(),
@@ -5664,8 +5666,9 @@
// SelectionDAG::Combine - This is the entry point for the file.
//
-void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA) {
+void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA,
+ bool Fast) {
/// run - This is the main entry point to this class.
///
- DAGCombiner(*this, AA).Run(RunningAfterLegalize);
+ DAGCombiner(*this, AA, Fast).Run(RunningAfterLegalize);
}