[llvm-commits] CVS: llvm/lib/VMCore/Instruction.cpp

[Chris Lattner]

Changes in directory llvm/lib/VMCore:

Instruction.cpp updated: 1.65 -> 1.66
---
Log message:

make mayWriteToMemory a non-virtual function


---
Diffs of the changes:  (+19 -0)

 Instruction.cpp |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+)


Index: llvm/lib/VMCore/Instruction.cpp
diff -u llvm/lib/VMCore/Instruction.cpp:1.65 llvm/lib/VMCore/Instruction.cpp:1.66
--- llvm/lib/VMCore/Instruction.cpp:1.65	Tue Feb 13 01:54:42 2007
+++ llvm/lib/VMCore/Instruction.cpp	Thu Feb 15 17:15:00 2007
@@ -225,6 +225,25 @@
   return true;
 }
 
+/// mayWriteToMemory - Return true if this instruction may modify memory.
+///
+bool Instruction::mayWriteToMemory() const {
+  switch (getOpcode()) {
+  default: return false;
+  case Instruction::Free:
+  case Instruction::Store:
+  case Instruction::Invoke:
+  case Instruction::VAArg:
+    return true;
+  case Instruction::Call:
+    if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(this)) {
+      // If the intrinsic doesn't write memory, it is safe.
+    }
+    return true;
+  case Instruction::Load:
+    return cast<LoadInst>(this)->isVolatile();
+  }
+}
 
 /// isAssociative - Return true if the instruction is associative:
 ///