Change memcpy/memset/memmove to have dest and source alignments.

This is a follow on from a similar LLVM commit: r253511.

Note, this was reviewed (and more details are in) http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151109/312083.html

These intrinsics currently have an explicit alignment argument which is
required to be a constant integer.  It represents the alignment of the
source and dest, and so must be the minimum of those.

This change allows source and dest to each have their own alignments
by using the alignment attribute on their arguments.  The alignment
argument itself is removed.

The only code change to clang is hidden in CGBuilder.h which now passes
both dest and source alignment to IRBuilder, instead of taking the minimum of
dest and source alignments.

Reviewed by Hal Finkel.

llvm-svn: 253512

1 files changed, 6 insertions, 6 deletions

diff --git a/clang/lib/CodeGen/CGBuilder.h b/clang/lib/CodeGen/CGBuilder.h
index 489f3413d4b..4daf0c760ef 100644
--- a/clang/lib/CodeGen/CGBuilder.h
+++ b/clang/lib/CodeGen/CGBuilder.h
@@ -271,23 +271,23 @@ public:
   using CGBuilderBaseTy::CreateMemCpy;
   llvm::CallInst *CreateMemCpy(Address Dest, Address Src, llvm::Value *Size,
                                bool IsVolatile = false) {
-    auto Align = std::min(Dest.getAlignment(), Src.getAlignment());
     return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
-                        Align.getQuantity(), IsVolatile);
+                        Dest.getAlignment().getQuantity(),
+                        Src.getAlignment().getQuantity(), IsVolatile);
   }
   llvm::CallInst *CreateMemCpy(Address Dest, Address Src, uint64_t Size,
                                bool IsVolatile = false) {
-    auto Align = std::min(Dest.getAlignment(), Src.getAlignment());
     return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
-                        Align.getQuantity(), IsVolatile);
+                        Dest.getAlignment().getQuantity(),
+                        Src.getAlignment().getQuantity(), IsVolatile);
   }
 
   using CGBuilderBaseTy::CreateMemMove;
   llvm::CallInst *CreateMemMove(Address Dest, Address Src, llvm::Value *Size,
                                 bool IsVolatile = false) {
-    auto Align = std::min(Dest.getAlignment(), Src.getAlignment());
     return CreateMemMove(Dest.getPointer(), Src.getPointer(), Size,
-                         Align.getQuantity(), IsVolatile);
+                         Dest.getAlignment().getQuantity(),
+                         Src.getAlignment().getQuantity(), IsVolatile);
   }
 
   using CGBuilderBaseTy::CreateMemSet;