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Issue #24221: Small optimizations for heapq.

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Replaces the PyList_GET_ITEM and PyList_SET_ITEM macros with normal array
accesses.  Replace the siftup unpredicatable branch with arithmetic.
Replace the rc == -1 tests with rc < 0.  Gives nicer looking assembly
with both Clang and GCC-4.9.  Also gives a small performance both for both.
This commit is contained in:
Raymond Hettinger 2015-05-22 00:41:57 -07:00
parent 35e24a50c5
commit 5cbd8331ff
2 changed files with 44 additions and 37 deletions
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Include/listobject.h
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@ -72,6 +72,7 @@ PyAPI_FUNC(void) _PyList_DebugMallocStats(FILE *out);
#define PyList_GET_ITEM(op, i) (((PyListObject *)(op))->ob_item[i])
#define PyList_SET_ITEM(op, i, v) (((PyListObject *)(op))->ob_item[i] = (v))
#define PyList_GET_SIZE(op) Py_SIZE(op)
#define _PyList_ITEMS(op) (((PyListObject *)(op))->ob_item)
#endif
#ifdef __cplusplus