Add the value of "suitably aligned" from the C++11 standard to Basic/TargetInfo.

This is equal to alignof(std::max_align_t) on the platform and equal to the
alignment provided by malloc. (Platform owners please double-check your
platform's value.)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146762 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Basic/TargetInfo.h

@@ -76,6 +76,7 @@ protected:
   unsigned char LargeArrayMinWidth, LargeArrayAlign;
   unsigned char LongWidth, LongAlign;
   unsigned char LongLongWidth, LongLongAlign;
+  unsigned char SuitableAlign;
   unsigned char MaxAtomicPromoteWidth, MaxAtomicInlineWidth;
   const char *DescriptionString;
   const char *UserLabelPrefix;
@@ -212,6 +213,10 @@ public:
   unsigned getLongLongWidth() const { return LongLongWidth; }
   unsigned getLongLongAlign() const { return LongLongAlign; }
 
+  /// getSuitableAlign - Return the alignment that is suitable for storing any
+  /// object with a fundamental alignment requirement.
+  unsigned getSuitableAlign() const { return SuitableAlign; }
+
   /// getWCharWidth/Align - Return the size of 'wchar_t' for this target, in
   /// bits.
   unsigned getWCharWidth() const { return getTypeWidth(WCharType); }

lib/Basic/TargetInfo.cpp

@@ -34,6 +34,7 @@ TargetInfo::TargetInfo(const std::string &T) : Triple(T) {
   IntWidth = IntAlign = 32;
   LongWidth = LongAlign = 32;
   LongLongWidth = LongLongAlign = 64;
+  SuitableAlign = 64;
   HalfWidth = 16;
   HalfAlign = 16;
   FloatWidth = 32;

lib/Basic/Targets.cpp

@@ -2049,6 +2049,7 @@ public:
     DoubleAlign = LongLongAlign = 32;
     LongDoubleWidth = 96;
     LongDoubleAlign = 32;
+    SuitableAlign = 32;
     DescriptionString = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
                         "i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-"
                         "a0:0:64-f80:32:32-n8:16:32-S128";
@@ -2098,6 +2099,7 @@ public:
     DarwinTargetInfo<X86_32TargetInfo>(triple) {
     LongDoubleWidth = 128;
     LongDoubleAlign = 128;
+    SuitableAlign = 128;
     SizeType = UnsignedLong;
     IntPtrType = SignedLong;
     DescriptionString = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-"
@@ -2290,6 +2292,7 @@ public:
     LongDoubleAlign = 128;
     LargeArrayMinWidth = 128;
     LargeArrayAlign = 128;
+    SuitableAlign = 128;
     IntMaxType = SignedLong;
     UIntMaxType = UnsignedLong;
     Int64Type = SignedLong;
@@ -2498,7 +2501,7 @@ public:
     // FIXME: We need support for -meabi... we could just mangle it into the
     // name.
     if (Name == "apcs-gnu") {
-      DoubleAlign = LongLongAlign = LongDoubleAlign = 32;
+      DoubleAlign = LongLongAlign = LongDoubleAlign = SuitableAlign = 32;
       SizeType = UnsignedLong;
 
       // Revert to using SignedInt on apcs-gnu to comply with existing behaviour.
@@ -3087,6 +3090,7 @@ namespace {
       LongWidth = 32; LongLongWidth = 64;
       LongAlign = LongLongAlign = 16;
       PointerWidth = 16; PointerAlign = 16;
+      SuitableAlign = 16;
       SizeType = UnsignedInt;
       IntMaxType = SignedLong;
       UIntMaxType = UnsignedLong;
@@ -3168,6 +3172,7 @@ namespace {
       IntAlign = 32;
       LongAlign = LongLongAlign = 32;
       PointerAlign = 32;
+      SuitableAlign = 32;
       SizeType = UnsignedInt;
       IntMaxType = SignedLong;
       UIntMaxType = UnsignedLong;
@@ -3397,6 +3402,7 @@ public:
     PointerWidth = PointerAlign = 64;
     LongDoubleWidth = LongDoubleAlign = 128;
     LongDoubleFormat = &llvm::APFloat::IEEEquad;
+    SuitableAlign = 128;
   }
   virtual bool setABI(const std::string &Name) {
     SetDescriptionString(Name);