hdl.ast: add Value.{any,all}, mapping to $reduce_{or,and}.

Refs #147.

nmigen/back/pysim.py

@@ -129,6 +129,12 @@ class _RHSValueCompiler(_ValueCompiler):
                 return lambda state: normalize(-arg(state), shape)
             if value.op == "b":
                 return lambda state: normalize(bool(arg(state)), shape)
+            if value.op == "r|":
+                return lambda state: normalize(arg(state) != 0, shape)
+            if value.op == "r&":
+                val, = value.operands
+                mask = (1 << len(val)) - 1
+                return lambda state: normalize(arg(state) == mask, shape)
         elif len(value.operands) == 2:
             lhs, rhs = map(self, value.operands)
             if value.op == "+":

nmigen/back/rtlil.py

@@ -375,6 +375,9 @@ class _RHSValueCompiler(_ValueCompiler):
         (1, "~"):    "$not",
         (1, "-"):    "$neg",
         (1, "b"):    "$reduce_bool",
+        (1, "r|"):   "$reduce_or",
+        (1, "r&"):   "$reduce_and",
+        (1, "r^"):   "$reduce_xor",
         (2, "+"):    "$add",
         (2, "-"):    "$sub",
         (2, "*"):    "$mul",