[X86][DAG] Switch X86 Target to post-legalized store merge

Move store merge to happen after intrinsic lowering to allow lowered
stores to be merged.

Some regressions due in MergeConsecutiveStores to missing
insert_subvector that are addressed in follow up patch.

Reviewers: craig.topper, efriedma, RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34559

llvm-svn: 310710

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
index ec5bf4b7f55..82117523bf0 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -812,6 +812,8 @@ namespace llvm {
     /// This method returns the name of a target specific DAG node.
     const char *getTargetNodeName(unsigned Opcode) const override;
 
+    bool mergeStoresAfterLegalization() const override { return true; }
+
     bool isCheapToSpeculateCttz() const override;
 
     bool isCheapToSpeculateCtlz() const override;
@@ -867,6 +869,8 @@ namespace llvm {
                                              const SelectionDAG &DAG,
                                              unsigned Depth) const override;
 
+    SDValue unwrapAddress(SDValue N) const override;
+
     bool isGAPlusOffset(SDNode *N, const GlobalValue* &GA,
                         int64_t &Offset) const override;