Revert Christopher Lamb's load/store alignment changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36309 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 48 deletions

diff --git a/lib/Bytecode/Reader/Reader.cpp b/lib/Bytecode/Reader/Reader.cpp
index 59c69d7c49..49792693dc 100644
--- a/lib/Bytecode/Reader/Reader.cpp
+++ b/lib/Bytecode/Reader/Reader.cpp
@@ -831,31 +831,13 @@ void BytecodeReader::ParseInstruction(SmallVector<unsigned, 8> &Oprnds,
                                      &Idx[0], Idx.size());
       break;
     }
-    case 62: {   // attributed load
-        if (Oprnds.size() != 2 || !isa<PointerType>(InstTy))
-          error("Invalid attributed load instruction!");
-        signed Log2AlignVal = ((Oprnds[1]>>1)-1);
-        Result = new LoadInst(getValue(iType, Oprnds[0]), "", (Oprnds[1] & 1),
-                              ((Log2AlignVal < 0) ? 0 : 1<<Log2AlignVal));
-        break;
-      }
+    case 62:   // volatile load
     case Instruction::Load:
       if (Oprnds.size() != 1 || !isa<PointerType>(InstTy))
         error("Invalid load instruction!");
-      Result = new LoadInst(getValue(iType, Oprnds[0]), "");
+      Result = new LoadInst(getValue(iType, Oprnds[0]), "", Opcode == 62);
       break;
-    case 63: {   // attributed store
-        if (!isa<PointerType>(InstTy) || Oprnds.size() != 3)
-          error("Invalid store instruction!");
-
-        Value *Ptr = getValue(iType, Oprnds[1]);
-        const Type *ValTy = cast<PointerType>(Ptr->getType())->getElementType();
-        signed Log2AlignVal = ((Oprnds[2]>>1)-1);
-        Result = new StoreInst(getValue(getTypeSlot(ValTy), Oprnds[0]), Ptr,
-                               (Oprnds[2] & 1), 
-                               ((Log2AlignVal < 0) ? 0 : 1<<Log2AlignVal));
-        break;
-      }
+    case 63:   // volatile store
     case Instruction::Store: {
       if (!isa<PointerType>(InstTy) || Oprnds.size() != 2)
         error("Invalid store instruction!");
diff --git a/lib/Bytecode/Writer/Writer.cpp b/lib/Bytecode/Writer/Writer.cpp
index 1dd0dc923a..4688e69ef2 100644
--- a/lib/Bytecode/Writer/Writer.cpp
+++ b/lib/Bytecode/Writer/Writer.cpp
@@ -616,7 +616,7 @@ void BytecodeWriter::outputInstruction(const Instruction &I) {
   unsigned Opcode = I.getOpcode();
   unsigned NumOperands = I.getNumOperands();
 
-  // Encode 'tail call' as 61
+  // Encode 'tail call' as 61, 'volatile load' as 62, and 'volatile store' as
   // 63.
   if (const CallInst *CI = dyn_cast<CallInst>(&I)) {
     if (CI->getCallingConv() == CallingConv::C) {
@@ -632,6 +632,10 @@ void BytecodeWriter::outputInstruction(const Instruction &I) {
     } else {
       Opcode = 58;      // Call escape sequence.
     }
+  } else if (isa<LoadInst>(I) && cast<LoadInst>(I).isVolatile()) {
+    Opcode = 62;
+  } else if (isa<StoreInst>(I) && cast<StoreInst>(I).isVolatile()) {
+    Opcode = 63;
   }
 
   // Figure out which type to encode with the instruction.  Typically we want
@@ -740,32 +744,6 @@ void BytecodeWriter::outputInstruction(const Instruction &I) {
     } else if (isa<InvokeInst>(I)) {
       // Invoke escape seq has at least 4 operands to encode.
       ++NumOperands;
-    } else if (const LoadInst *LI = dyn_cast<LoadInst>(&I)) {
-      // Encode attributed load as opcode 62
-      // We need to encode the attributes of the load instruction as the second
-      // operand. Its not really a slot, but we don't want to break the 
-      // instruction format for these instructions.
-      if (LI->getAlignment() || LI->isVolatile()) {
-        NumOperands = 2;
-        Slots[1] = ((Log2_32(LI->getAlignment())+1)<<1) + 
-                    (LI->isVolatile() ? 1 : 0);
-        if (Slots[1] > MaxOpSlot) 
-          MaxOpSlot = Slots[1];
-        Opcode = 62;
-      }
-    } else if (const StoreInst *SI = dyn_cast<StoreInst>(&I)) {
-      // Encode attributed store as opcode 63
-      // We need to encode the attributes of the store instruction as the third
-      // operand. Its not really a slot, but we don't want to break the 
-      // instruction format for these instructions.
-      if (SI->getAlignment() || SI->isVolatile()) {
-        NumOperands = 3;
-        Slots[2] = ((Log2_32(SI->getAlignment())+1)<<1) + 
-                    (SI->isVolatile() ? 1 : 0);
-        if (Slots[2] > MaxOpSlot) 
-          MaxOpSlot = Slots[2];
-        Opcode = 63;
-      }
     }
 
     // Decide which instruction encoding to use.  This is determined primarily