Implement support for non-standard integer bit widths of any size. The

rules alignment is to pick the alignment that corresponds to the smallest
specified alignment that is larger than the bit width of the type or the
largest specified integer alignment if none are larger than the bitwidth
of the type. For the byte size, the size returned is the next larger
multiple of the alignment for that type (using the above rule). This patch
also changes bit widths from "short" to "uint32_t" to ensure there are
enough bits to specify any bit width that LLVM can handle (currently 2^23);
16-bits isn't enough.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34431 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 33 insertions, 10 deletions

diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp
index 696bdc2d76..bafe8e32f7 100644
--- a/lib/Target/TargetData.cpp
+++ b/lib/Target/TargetData.cpp
@@ -94,7 +94,7 @@ unsigned StructLayout::getElementContainingOffset(uint64_t Offset) const {
 
 TargetAlignElem
 TargetAlignElem::get(AlignTypeEnum align_type, unsigned char abi_align,
-                     unsigned char pref_align, short bit_width) {
+                     unsigned char pref_align, uint32_t bit_width) {
   TargetAlignElem retval;
   retval.AlignType = align_type;
   retval.ABIAlign = abi_align;
@@ -188,7 +188,7 @@ void TargetData::init(const std::string &TargetDescription) {
     std::string arg0 = getToken(token, ":");
     const char *p = arg0.c_str();
     AlignTypeEnum align_type;
-    short size;
+    uint32_t size;
     unsigned char abi_align;
     unsigned char pref_align;
 
@@ -213,7 +213,7 @@ void TargetData::init(const std::string &TargetDescription) {
       align_type = (*p == 'i' ? INTEGER_ALIGN :
                     (*p == 'f' ? FLOAT_ALIGN :
                      (*p == 'v' ? VECTOR_ALIGN : AGGREGATE_ALIGN)));
-      size = (short) atoi(++p);
+      size = (uint32_t) atoi(++p);
       abi_align = atoi(getToken(token, ":").c_str()) / 8;
       pref_align = atoi(getToken(token, ":").c_str()) / 8;
       if (pref_align == 0)
@@ -233,7 +233,7 @@ TargetData::TargetData(const Module *M) {
 
 void
 TargetData::setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
-                         unsigned char pref_align, short bit_width) {
+                         unsigned char pref_align, uint32_t bit_width) {
   for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
     if (Alignments[i].AlignType == align_type &&
         Alignments[i].TypeBitWidth == bit_width) {
@@ -250,10 +250,11 @@ TargetData::setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
 
 /// getAlignmentInfo - Return the alignment (either ABI if ABIInfo = true or 
 /// preferred if ABIInfo = false) the target wants for the specified datatype.
-unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType, short BitWidth,
-                                      bool ABIInfo) const {
+unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType, 
+                                      uint32_t BitWidth, bool ABIInfo) const {
   // Check to see if we have an exact match and remember the best match we see.
   int BestMatchIdx = -1;
+  int LargestInt = -1;
   for (unsigned i = 0, e = Alignments.size(); i != e; ++i) {
     if (Alignments[i].AlignType == AlignType &&
         Alignments[i].TypeBitWidth == BitWidth)
@@ -271,14 +272,30 @@ unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType, short BitWidth,
             Alignments[BestMatchIdx].TypeBitWidth < BitWidth)
           BestMatchIdx = i;
       }
+    } else if (AlignType == INTEGER_ALIGN && 
+               Alignments[i].AlignType == INTEGER_ALIGN) {
+      // The "best match" for integers is the smallest size that is larger than
+      // the BitWidth requested.
+      if (Alignments[i].TypeBitWidth > BitWidth && (BestMatchIdx == -1 || 
+           Alignments[i].TypeBitWidth < Alignments[BestMatchIdx].TypeBitWidth))
+        BestMatchIdx = i;
+      // However, if there isn't one that's larger, then we must use the
+      // largest one we have (see below)
+      if (LargestInt == -1 || 
+          Alignments[i].TypeBitWidth > Alignments[LargestInt].TypeBitWidth)
+        LargestInt = i;
     }
-    
-    // FIXME: handle things like i37.
   }
 
+  // For integers, if we didn't find a best match, use the largest one found.
+  if (BestMatchIdx == -1)
+    BestMatchIdx = LargestInt;
+
   // Okay, we didn't find an exact solution.  Fall back here depending on what
   // is being looked for.
   assert(BestMatchIdx != -1 && "Didn't find alignment info for this datatype!");
+
+  // Since we got a "best match" index, just return it.
   return ABIInfo ? Alignments[BestMatchIdx].ABIAlign
                  : Alignments[BestMatchIdx].PrefAlign;
 }
@@ -407,8 +424,14 @@ uint64_t TargetData::getTypeSize(const Type *Ty) const {
       return 4;
     } else if (BitWidth <= 64) {
       return 8;
-    } else
-      assert(0 && "Integer types > 64 bits not supported.");
+    } else {
+      // The size of this > 64 bit type is chosen as a multiple of the
+      // preferred alignment of the largest "native" size the target supports. 
+      // We first obtain the the alignment info for this type and then compute
+      // the next largest multiple of that size.
+      uint64_t size = getAlignmentInfo(INTEGER_ALIGN, BitWidth, false) * 8;
+      return (((BitWidth / (size)) + (BitWidth % size != 0)) * size) / 8;
+    }
     break;
   }
   case Type::VoidTyID: