[llvm-commits] CVS: llvm/lib/Target/CBackend/CBackend.cpp

[Reid Spencer]

Changes in directory llvm/lib/Target/CBackend:

CBackend.cpp updated: 1.328 -> 1.329
---
Log message:

Make sure that when we store a value it is masked to its correct bit 
width. This helps CBE work with non-standard integer bit widths.


---
Diffs of the changes:  (+15 -1)

 CBackend.cpp |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletion(-)


Index: llvm/lib/Target/CBackend/CBackend.cpp
diff -u llvm/lib/Target/CBackend/CBackend.cpp:1.328 llvm/lib/Target/CBackend/CBackend.cpp:1.329
--- llvm/lib/Target/CBackend/CBackend.cpp:1.328	Fri Feb 23 16:45:08 2007
+++ llvm/lib/Target/CBackend/CBackend.cpp	Sat Mar  3 10:33:33 2007
@@ -2815,7 +2815,21 @@
   writeOperand(I.getPointerOperand());
   if (I.isVolatile()) Out << ')';
   Out << " = ";
-  writeOperand(I.getOperand(0));
+  Value *Operand = I.getOperand(0);
+  Constant *BitMask = 0;
+  if (const IntegerType* ITy = dyn_cast<IntegerType>(Operand->getType()))
+    if (!ITy->isPowerOf2ByteWidth())
+      // We have a bit width that doesn't match an even power-of-2 byte
+      // size. Consequently we must & the value with the type's bit mask
+      BitMask = ConstantInt::get(ITy, ITy->getBitMask());
+  if (BitMask)
+    Out << "((";
+  writeOperand(Operand);
+  if (BitMask) {
+    Out << ") & ";
+    printConstant(BitMask);
+    Out << ")"; 
+  }
 }
 
 void CWriter::visitGetElementPtrInst(GetElementPtrInst &I) {