We can do cast-add elimination even on casts that reinterpret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1427 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/LevelRaise.cpp b/lib/Transforms/LevelRaise.cpp
index 19325b0..c35b5c6 100644
--- a/lib/Transforms/LevelRaise.cpp
+++ b/lib/Transforms/LevelRaise.cpp
@@ -51,7 +51,6 @@
-#if 0 // Unneccesary code, handled by convert exprs
// Peephole optimize the following instructions:
// %t1 = cast ? to x *
// %t2 = add x * %SP, %t1 ;; Constant must be 2nd operand
@@ -117,8 +116,7 @@
OtherPtr = C;
}
- GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices,
- I->getName());
+ GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices);
PRINT_PEEPHOLE1("cast-add-to-gep:i", I);
@@ -128,7 +126,6 @@
}
return true;
}
-#endif
// Peephole optimize the following instructions:
// %t1 = cast ulong <const int> to {<...>} *
@@ -269,16 +266,17 @@
#endif
return true;
}
-#if 0
- // Otherwise find out it this cast is a cast to a pointer type, which is
- // then added to some other pointer, then loaded or stored through. If
- // so, convert the add into a getelementptr instruction...
- //
- if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
- if (HandleCastToPointer(BI, DestPTy))
- return true;
+ }
+
+ // Otherwise find out it this cast is a cast to a pointer type, which is
+ // then added to some other pointer, then loaded or stored through. If
+ // so, convert the add into a getelementptr instruction...
+ //
+ if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
+ if (HandleCastToPointer(BI, DestPTy)) {
+ BI = BB->begin(); // Rescan basic block. BI might be invalidated.
+ return true;
}
-#endif
}
// Check to see if we are casting from a structure pointer to a pointer to