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Issue #13889: Merge fix from 3.2.

This commit is contained in:
Mark Dickinson 2012-04-15 15:12:37 +01:00
parent 69c635266e 18e3d81f96
commit b0f00476a0
2 changed files with 28 additions and 0 deletions
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24
Include/pyport.h
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@ -557,6 +557,30 @@ extern "C" {
_Py_set_387controlword(old_387controlword)
#endif
/* get and set x87 control word for VisualStudio/x86 */
#if defined(_MSC_VER) && !defined(_WIN64) /* x87 not supported in 64-bit */
#define HAVE_PY_SET_53BIT_PRECISION 1
#define _Py_SET_53BIT_PRECISION_HEADER \
unsigned int old_387controlword, new_387controlword, out_387controlword
/* We use the __control87_2 function to set only the x87 control word.
The SSE control word is unaffected. */
#define _Py_SET_53BIT_PRECISION_START \
do { \
__control87_2(0, 0, &old_387controlword, NULL); \
new_387controlword = \
(old_387controlword & ~(_MCW_PC | _MCW_RC)) | (_PC_53 | _RC_NEAR); \
if (new_387controlword != old_387controlword) \
__control87_2(new_387controlword, _MCW_PC | _MCW_RC, \
&out_387controlword, NULL); \
} while (0)
#define _Py_SET_53BIT_PRECISION_END \
do { \
if (new_387controlword != old_387controlword) \
__control87_2(old_387controlword, _MCW_PC | _MCW_RC, \
&out_387controlword, NULL); \
} while (0)
#endif
/* default definitions are empty */
#ifndef HAVE_PY_SET_53BIT_PRECISION
#define _Py_SET_53BIT_PRECISION_HEADER

4
Misc/NEWS
View File

@ -10,6 +10,10 @@ What's New in Python 3.3.0 Alpha 3?
Core and Builtins
-----------------
- Issue #13889: Check and (if necessary) set FPU control word before calling
any of the dtoa.c string <-> float conversion functions, on MSVC builds of
Python. This fixes issues when embedding Python in a Delphi app.
- Issue #2377: Make importlib the implementation of __import__().
- Issue #1559549: ImportError now has 'name' and 'path' attributes that are set