Add alignment value to allowsUnalignedMemoryAccess

Rename to allowsMisalignedMemoryAccess.

On R600, 8 and 16 byte accesses are mostly OK with 4-byte alignment,
and don't need to be split into multiple accesses. Vector loads with
an alignment of the element type are not uncommon in OpenCL code.

llvm-svn: 214055

2 files changed, 6 insertions, 5 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 38a6ba0d91f..6ae818abe86 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -1775,9 +1775,10 @@ bool X86TargetLowering::isSafeMemOpType(MVT VT) const {
 }
 
 bool
-X86TargetLowering::allowsUnalignedMemoryAccesses(EVT VT,
-                                                 unsigned,
-                                                 bool *Fast) const {
+X86TargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
+                                                  unsigned,
+                                                  unsigned,
+                                                  bool *Fast) const {
   if (Fast)
     *Fast = Subtarget->isUnalignedMemAccessFast();
   return true;
diff --git a/llvm/lib/Target/X86/X86ISelLowering.h b/llvm/lib/Target/X86/X86ISelLowering.h
index 32941766158..f0e4cf8280b 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.h
+++ b/llvm/lib/Target/X86/X86ISelLowering.h
@@ -565,10 +565,10 @@ namespace llvm {
     /// legal as the hook is used before type legalization.
     bool isSafeMemOpType(MVT VT) const override;
 
-    /// allowsUnalignedMemoryAccesses - Returns true if the target allows
+    /// allowsMisalignedMemoryAccesses - Returns true if the target allows
     /// unaligned memory accesses. of the specified type. Returns whether it
     /// is "fast" by reference in the second argument.
-    bool allowsUnalignedMemoryAccesses(EVT VT, unsigned AS,
+    bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, unsigned Align,
                                        bool *Fast) const override;
 
     /// LowerOperation - Provide custom lowering hooks for some operations.