moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/codegen/meta-python/cdsl/__init__.py

@@ -0,0 +1,59 @@
+"""
+Cranelift DSL classes.
+
+This module defines the classes that are used to define Cranelift instructions
+and other entities.
+"""
+from __future__ import absolute_import
+import re
+
+
+camel_re = re.compile('(^|_)([a-z])')
+
+
+def camel_case(s):
+    # type: (str) -> str
+    """Convert the string s to CamelCase:
+        >>> camel_case('x')
+        'X'
+        >>> camel_case('camel_case')
+        'CamelCase'
+    """
+    return camel_re.sub(lambda m: m.group(2).upper(), s)
+
+
+def is_power_of_two(x):
+    # type: (int) -> bool
+    """Check if `x` is a power of two:
+        >>> is_power_of_two(0)
+        False
+        >>> is_power_of_two(1)
+        True
+        >>> is_power_of_two(2)
+        True
+        >>> is_power_of_two(3)
+        False
+    """
+    return x > 0 and x & (x-1) == 0
+
+
+def next_power_of_two(x):
+    # type: (int) -> int
+    """
+    Compute the next power of two that is greater than `x`:
+        >>> next_power_of_two(0)
+        1
+        >>> next_power_of_two(1)
+        2
+        >>> next_power_of_two(2)
+        4
+        >>> next_power_of_two(3)
+        4
+        >>> next_power_of_two(4)
+        8
+    """
+    s = 1
+    while x & (x + 1) != 0:
+        x |= x >> s
+        s *= 2
+    return x + 1