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reapply the patches reverted in r149470 that reenable ConstantDataArray,

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but with a critical fix to the SelectionDAG code that optimizes copies
from strings into immediate stores: the previous code was stopping reading
string data at the first nul.  Address this by adding a new argument to
llvm::getConstantStringInfo, preserving the behavior before the patch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149800 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2012-02-05 02:29:43 +00:00
parent eea723fe02
commit 18c7f80b3e
19 changed files with 276 additions and 539 deletions
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20
include/llvm/Analysis/ValueTracking.h
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@@ -17,14 +17,13 @@
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/DataTypes.h"
#include <string>
namespace llvm {
template <typename T> class SmallVectorImpl;
class Value;
class Instruction;
class APInt;
class TargetData;
class StringRef;
/// ComputeMaskedBits - Determine which of the bits specified in Mask are
/// known to be either zero or one and return them in the KnownZero/KnownOne
@@ -125,16 +124,15 @@ namespace llvm {
return GetPointerBaseWithConstantOffset(const_cast<Value*>(Ptr), Offset,TD);
}
/// GetConstantStringInfo - This function computes the length of a
/// getConstantStringInfo - This function computes the length of a
/// null-terminated C string pointed to by V. If successful, it returns true
/// and returns the string in Str. If unsuccessful, it returns false. If
/// StopAtNul is set to true (the default), the returned string is truncated
/// by a nul character in the global. If StopAtNul is false, the nul
/// character is included in the result string.
bool GetConstantStringInfo(const Value *V, std::string &Str,
uint64_t Offset = 0,
bool StopAtNul = true);
/// and returns the string in Str. If unsuccessful, it returns false. This
/// does not include the trailing nul character by default. If TrimAtNul is
/// set to false, then this returns any trailing nul characters as well as any
/// other characters that come after it.
bool getConstantStringInfo(const Value *V, StringRef &Str,
uint64_t Offset = 0, bool TrimAtNul = true);
/// GetStringLength - If we can compute the length of the string pointed to by
/// the specified pointer, return 'len+1'. If we can't, return 0.
uint64_t GetStringLength(Value *V);