Move formats, entities, and immediates to the base package.

- base.formats defines instruction formats.
- base.entities defines kinds of entity references.
- base.immediates defines kinds of imediate operands.

lib/cretonne/meta/base/immediates.py

@@ -0,0 +1,52 @@
+"""
+The `cretonne.immediates` module predefines all the Cretonne immediate operand
+types.
+"""
+from __future__ import absolute_import
+from cdsl.operands import ImmediateKind
+
+#: A 64-bit immediate integer operand.
+#:
+#: This type of immediate integer can interact with SSA values with any
+#: :py:class:`cretonne.IntType` type.
+imm64 = ImmediateKind('imm64', 'A 64-bit immediate integer.')
+
+#: An unsigned 8-bit immediate integer operand.
+#:
+#: This small operand is used to indicate lane indexes in SIMD vectors and
+#: immediate bit counts on shift instructions.
+uimm8 = ImmediateKind('uimm8', 'An 8-bit immediate unsigned integer.')
+
+#: A 32-bit immediate floating point operand.
+#:
+#: IEEE 754-2008 binary32 interchange format.
+ieee32 = ImmediateKind('ieee32', 'A 32-bit immediate floating point number.')
+
+#: A 64-bit immediate floating point operand.
+#:
+#: IEEE 754-2008 binary64 interchange format.
+ieee64 = ImmediateKind('ieee64', 'A 64-bit immediate floating point number.')
+
+#: A large SIMD vector constant.
+immvector = ImmediateKind(
+        'immvector',
+        'An immediate SIMD vector.',
+        rust_type='ImmVector')
+
+#: A condition code for comparing integer values.
+#:
+#: This enumerated operand kind is used for the :cton:inst:`icmp` instruction
+#: and corresponds to the `condcodes::IntCC` Rust type.
+intcc = ImmediateKind(
+        'intcc',
+        'An integer comparison condition code.',
+        default_member='cond', rust_type='IntCC')
+
+#: A condition code for comparing floating point values.
+#:
+#: This enumerated operand kind is used for the :cton:inst:`fcmp` instruction
+#: and corresponds to the `condcodes::FloatCC` Rust type.
+floatcc = ImmediateKind(
+        'floatcc',
+        'A floating point comparison condition code.',
+        default_member='cond', rust_type='FloatCC')