[COMPILER] Upgrade to meet latest TVM IR pragma convention (apache#32)

Author: tqchen

vta/python/vta/ir_pass.py

@@ -8,6 +8,21 @@
 from .environment import get_env
 
 
+def _match_pragma(stmt, key):
+    """Internal helper to match stmt to pragma stmt.
+
+    Parameters
+    ----------
+    stmt : Stmt
+        The AttrStmt
+
+    key : str
+        The pragma key
+    """
+    return ((stmt.attr_key == "pragma_" + key) or
+            (stmt.attr_key == "pragma_scope" and stmt.value.value == key))
+
+
 def fold_uop_loop(stmt_in):
     """Detect and fold uop loop.
 
@@ -255,7 +270,7 @@ def inject_skip_copy(stmt_in):
         Transformed statement
     """
     def _do_fold(stmt):
-        if (stmt.attr_key == "pragma_scope" and stmt.value.value == "skip_dma_copy"):
+        if _match_pragma(stmt, "skip_dma_copy"):
             return tvm.make.Evaluate(0)
         return None
     return tvm.ir_pass.IRTransform(
@@ -277,12 +292,12 @@ def inject_coproc_sync(stmt_in):
     """
     success = [False]
     def _do_fold(stmt):
-        if stmt.attr_key == "pragma_scope" and stmt.value.value == "coproc_sync":
+        if _match_pragma(stmt, "coproc_sync"):
             success[0] = True
             sync = tvm.make.Call(
                 "int32", "vta.coproc_sync", [], tvm.expr.Call.Intrinsic, None, 0)
             return tvm.make.Block(stmt.body, tvm.make.Evaluate(sync))
-        elif stmt.attr_key == "pragma_scope" and stmt.value.value == "trim_loop":
+        elif _match_pragma(stmt, "trim_loop"):
             op = stmt.body
             assert isinstance(op, tvm.stmt.For)
             return tvm.make.For(
@@ -561,15 +576,15 @@ def annotate_alu_coproc_scope(stmt_in):
     """
     env = get_env()
     def _do_fold(stmt):
-        if (stmt.attr_key == "pragma_scope" and stmt.value.value == "alu"):
+        if _match_pragma(stmt, "alu"):
             irb = tvm.ir_builder.create()
             irb.scope_attr(env.dev.vta_axis, "coproc_scope",
                            env.dev.get_task_qid(env.dev.QID_COMPUTE))
             irb.scope_attr(env.dev.vta_axis, "coproc_uop_scope",
                            tvm.make.StringImm("VTAPushALUOp"))
             irb.emit(stmt)
             return irb.get()
-        elif (stmt.attr_key == "pragma_scope" and stmt.value.value == "skip_alu"):
+        elif _match_pragma(stmt, "skip_alu"):
             return tvm.make.Evaluate(0)
         return stmt
 
@@ -631,7 +646,7 @@ def _flatten_loop(src_coeff, dst_coeff, extents):
 
             return rev_src_coeff, rev_dst_coeff, rev_extents
 
-        if (stmt.attr_key == "pragma_scope" and stmt.value.value == "alu"):
+        if _match_pragma(stmt, "alu"):
             # Get to the innermost loop body
             loop_body = stmt.body
             nest_size = 0