[globalisel][tablegen] Generalize pointer-type inference by introducing ptypeN. NFC

ptypeN is functionally the same as typeN except that it informs the
SelectionDAG importer that an operand should be treated as a pointer even
if it was written as iN. This is important for patterns that use iN instead
of iPTR to represent pointers. E.g.:
  (set GPR64:$dst, (load GPR64:$addr))

Previously, this was handled as a hardcoded special case for the appropriate
operands to G_LOAD and G_STORE.

llvm-svn: 318574

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index e173e153879..9cff95b1247 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -284,6 +284,12 @@ template <typename T> class ArrayRef;
     /// include text from the specified variant, returning the new string.
     static std::string FlattenAsmStringVariants(StringRef AsmString,
                                                 unsigned Variant);
+
+    // Is the specified operand in a generic instruction implicitly a pointer.
+    // This can be used on intructions that use typeN or ptypeN to identify
+    // operands that should be considered as pointers even though SelectionDAG
+    // didn't make a distinction between integer and pointers.
+    bool isOperandAPointer(unsigned i) const;
   };