Add a per target max vector alignment field (e.g., 32-byte alignment for x86 due to

AVX).  Currently, if no aligned attribute is specified the alignment of a vector is
inferred from its size.  Thus, very large vectors will be over-aligned with no 
benefit.  Target owners should set this target max.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160209 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/include/clang/Basic/TargetInfo.h b/include/clang/Basic/TargetInfo.h
index 125496a360..54d49e6fa5 100644
--- a/include/clang/Basic/TargetInfo.h
+++ b/include/clang/Basic/TargetInfo.h
@@ -80,6 +80,7 @@ protected:
   unsigned char LongLongWidth, LongLongAlign;
   unsigned char SuitableAlign;
   unsigned char MaxAtomicPromoteWidth, MaxAtomicInlineWidth;
+  unsigned short MaxVectorAlign;
   const char *DescriptionString;
   const char *UserLabelPrefix;
   const char *MCountName;
@@ -308,6 +309,9 @@ public:
   /// inlined given the supported features of the given target.
   unsigned getMaxAtomicInlineWidth() const { return MaxAtomicInlineWidth; }
 
+  /// \brief Return the maximum vector alignment supported for the given target.
+  unsigned getMaxVectorAlign() const { return MaxVectorAlign; }
+
   /// \brief Return the size of intmax_t and uintmax_t for this target, in bits.
   unsigned getIntMaxTWidth() const {
     return getTypeWidth(IntMaxType);