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Tidy up SMALL_INT optimisations and CPython compatibility.

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Damien
2013-10-12 16:16:56 +01:00
parent 3a205179ea
commit 0efb3a1b66
3 changed files with 32 additions and 11 deletions
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5
py/parse.h
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@@ -11,6 +11,11 @@ struct _py_lexer_t;
// - xxxx...1101: a token; bits 4 and above are py_token_kind_t
// - xxxx...xxx0: pointer to py_parse_node_struct_t
// makes sure the top 5 bits of x are all cleared (positive number) or all set (negavite number)
// these macros can probably go somewhere else because they are used more than just in the parser
#define PY_UINT_HIGH_5_BITS (~((~((machine_uint_t)0)) >> 5))
#define PY_FIT_SMALL_INT(x) (((((machine_uint_t)(x)) & PY_UINT_HIGH_5_BITS) == 0) || ((((machine_uint_t)(x)) & PY_UINT_HIGH_5_BITS) == PY_UINT_HIGH_5_BITS))
#define PY_PARSE_NODE_NULL (0)
#define PY_PARSE_NODE_ID (0x1)
#define PY_PARSE_NODE_SMALL_INT (0x3)