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https://github.com/python/cpython
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bpo-45412: Move _Py_SET_53BIT_PRECISION_START to pycore_pymath.h (GH-28882)
Move the following macros , to pycore_pymath.h (internal C API):
* _Py_SET_53BIT_PRECISION_HEADER
* _Py_SET_53BIT_PRECISION_START
* _Py_SET_53BIT_PRECISION_END
PEP 7: add braces to if and "do { ... } while (0)" in these macros.
Move also _Py_get_387controlword() and _Py_set_387controlword()
definitions to pycore_pymath.h. These functions are no longer
exported.
pystrtod.c now includes pycore_pymath.h.
This commit is contained in:
Victor Stinner
GitHub
parent
a9fe1a8e5b
commit
7103356455
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@ -74,6 +74,97 @@ static inline void _Py_ADJUST_ERANGE2(double x, double y)
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#define _Py_InIntegralTypeRange(type, v) \
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(_Py_IntegralTypeMin(type) <= v && v <= _Py_IntegralTypeMax(type))
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//--- Implementation of the HAVE_PY_SET_53BIT_PRECISION macro -------------
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//--- defined in pyport.h -------------------------------------------------
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//
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// Give appropriate definitions for the following three macros:
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//
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// _Py_SET_53BIT_PRECISION_HEADER : any variable declarations needed to
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// use the two macros below.
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// _Py_SET_53BIT_PRECISION_START : store original FPU settings, and
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// set FPU to 53-bit precision/round-half-to-even
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// _Py_SET_53BIT_PRECISION_END : restore original FPU settings
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// Get and set x87 control word for gcc/x86
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#ifdef HAVE_GCC_ASM_FOR_X87
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// Functions defined in Python/pymath.c
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extern unsigned short _Py_get_387controlword(void);
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extern void _Py_set_387controlword(unsigned short);
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned short old_387controlword, new_387controlword
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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old_387controlword = _Py_get_387controlword(); \
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new_387controlword = (old_387controlword & ~0x0f00) | 0x0200; \
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if (new_387controlword != old_387controlword) { \
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_Py_set_387controlword(new_387controlword); \
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} \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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do { \
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if (new_387controlword != old_387controlword) { \
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_Py_set_387controlword(old_387controlword); \
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} \
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} while (0)
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#endif
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// Get and set x87 control word for VisualStudio/x86.
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// x87 is not supported in 64-bit or ARM.
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#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_M_ARM)
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned int old_387controlword, new_387controlword, out_387controlword
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// We use the __control87_2 function to set only the x87 control word.
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// The SSE control word is unaffected.
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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__control87_2(0, 0, &old_387controlword, NULL); \
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new_387controlword = \
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(old_387controlword & ~(_MCW_PC | _MCW_RC)) | (_PC_53 | _RC_NEAR); \
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if (new_387controlword != old_387controlword) { \
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__control87_2(new_387controlword, _MCW_PC | _MCW_RC, \
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&out_387controlword, NULL); \
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} \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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do { \
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if (new_387controlword != old_387controlword) { \
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__control87_2(old_387controlword, _MCW_PC | _MCW_RC, \
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&out_387controlword, NULL); \
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} \
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} while (0)
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#endif
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#ifdef HAVE_GCC_ASM_FOR_MC68881
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned int old_fpcr, new_fpcr
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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__asm__ ("fmove.l %%fpcr,%0" : "=g" (old_fpcr)); \
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/* Set double precision / round to nearest. */ \
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new_fpcr = (old_fpcr & ~0xf0) | 0x80; \
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if (new_fpcr != old_fpcr) { \
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__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (new_fpcr));\
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} \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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do { \
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if (new_fpcr != old_fpcr) { \
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__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (old_fpcr)); \
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} \
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} while (0)
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#endif
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// Default definitions are empty
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#ifndef _Py_SET_53BIT_PRECISION_HEADER
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# define _Py_SET_53BIT_PRECISION_HEADER
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# define _Py_SET_53BIT_PRECISION_START
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# define _Py_SET_53BIT_PRECISION_END
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#endif
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#ifdef __cplusplus
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}
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#endif
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@ -78,13 +78,6 @@ PyAPI_FUNC(double) _Py_force_double(double);
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#endif
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#endif
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#ifndef Py_LIMITED_API
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#ifdef HAVE_GCC_ASM_FOR_X87
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PyAPI_FUNC(unsigned short) _Py_get_387controlword(void);
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PyAPI_FUNC(void) _Py_set_387controlword(unsigned short);
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#endif
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#endif
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/* Py_IS_NAN(X)
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* Return 1 if float or double arg is a NaN, else 0.
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* Caution:
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@ -95,11 +88,11 @@ PyAPI_FUNC(void) _Py_set_387controlword(unsigned short);
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* Note: PC/pyconfig.h defines Py_IS_NAN as _isnan
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*/
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#ifndef Py_IS_NAN
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#if defined HAVE_DECL_ISNAN && HAVE_DECL_ISNAN == 1
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#define Py_IS_NAN(X) isnan(X)
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#else
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#define Py_IS_NAN(X) ((X) != (X))
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#endif
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# if defined HAVE_DECL_ISNAN && HAVE_DECL_ISNAN == 1
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# define Py_IS_NAN(X) isnan(X)
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# else
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# define Py_IS_NAN(X) ((X) != (X))
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# endif
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#endif
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/* Py_IS_INFINITY(X)
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@ -335,85 +335,24 @@ extern "C" {
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*
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* #define HAVE_PY_SET_53BIT_PRECISION 1
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*
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* and also give appropriate definitions for the following three macros:
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*
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* _PY_SET_53BIT_PRECISION_START : store original FPU settings, and
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* set FPU to 53-bit precision/round-half-to-even
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* _PY_SET_53BIT_PRECISION_END : restore original FPU settings
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* _PY_SET_53BIT_PRECISION_HEADER : any variable declarations needed to
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* use the two macros above.
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*
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* The macros are designed to be used within a single C function: see
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* Python/pystrtod.c for an example of their use.
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*/
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/* get and set x87 control word for gcc/x86 */
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// HAVE_PY_SET_53BIT_PRECISION macro must be kept in sync with pycore_pymath.h
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#ifdef HAVE_GCC_ASM_FOR_X87
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#define HAVE_PY_SET_53BIT_PRECISION 1
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/* _Py_get/set_387controlword functions are defined in Python/pymath.c */
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned short old_387controlword, new_387controlword
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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old_387controlword = _Py_get_387controlword(); \
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new_387controlword = (old_387controlword & ~0x0f00) | 0x0200; \
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if (new_387controlword != old_387controlword) \
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_Py_set_387controlword(new_387controlword); \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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if (new_387controlword != old_387controlword) \
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_Py_set_387controlword(old_387controlword)
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// Get and set x87 control word for gcc/x86
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# define HAVE_PY_SET_53BIT_PRECISION 1
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#endif
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/* get and set x87 control word for VisualStudio/x86 */
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#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_M_ARM) /* x87 not supported in 64-bit or ARM */
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#define HAVE_PY_SET_53BIT_PRECISION 1
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned int old_387controlword, new_387controlword, out_387controlword
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/* We use the __control87_2 function to set only the x87 control word.
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The SSE control word is unaffected. */
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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__control87_2(0, 0, &old_387controlword, NULL); \
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new_387controlword = \
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(old_387controlword & ~(_MCW_PC | _MCW_RC)) | (_PC_53 | _RC_NEAR); \
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if (new_387controlword != old_387controlword) \
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__control87_2(new_387controlword, _MCW_PC | _MCW_RC, \
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&out_387controlword, NULL); \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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do { \
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if (new_387controlword != old_387controlword) \
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__control87_2(old_387controlword, _MCW_PC | _MCW_RC, \
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&out_387controlword, NULL); \
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} while (0)
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#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_M_ARM)
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// Get and set x87 control word for VisualStudio/x86.
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// x87 not supported in 64-bit or ARM.
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# define HAVE_PY_SET_53BIT_PRECISION 1
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#endif
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#ifdef HAVE_GCC_ASM_FOR_MC68881
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#define HAVE_PY_SET_53BIT_PRECISION 1
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#define _Py_SET_53BIT_PRECISION_HEADER \
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unsigned int old_fpcr, new_fpcr
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#define _Py_SET_53BIT_PRECISION_START \
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do { \
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__asm__ ("fmove.l %%fpcr,%0" : "=g" (old_fpcr)); \
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/* Set double precision / round to nearest. */ \
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new_fpcr = (old_fpcr & ~0xf0) | 0x80; \
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if (new_fpcr != old_fpcr) \
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__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (new_fpcr)); \
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} while (0)
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#define _Py_SET_53BIT_PRECISION_END \
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do { \
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if (new_fpcr != old_fpcr) \
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__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (old_fpcr)); \
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} while (0)
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# define HAVE_PY_SET_53BIT_PRECISION 1
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#endif
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/* default definitions are empty */
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#ifndef HAVE_PY_SET_53BIT_PRECISION
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#define _Py_SET_53BIT_PRECISION_HEADER
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#define _Py_SET_53BIT_PRECISION_START
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#define _Py_SET_53BIT_PRECISION_END
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#endif
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/* If we can't guarantee 53-bit precision, don't use the code
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in Python/dtoa.c, but fall back to standard code. This
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@ -430,14 +369,14 @@ extern "C" {
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#if !defined(DOUBLE_IS_LITTLE_ENDIAN_IEEE754) && \
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!defined(DOUBLE_IS_BIG_ENDIAN_IEEE754) && \
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!defined(DOUBLE_IS_ARM_MIXED_ENDIAN_IEEE754)
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#define PY_NO_SHORT_FLOAT_REPR
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# define PY_NO_SHORT_FLOAT_REPR
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#endif
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/* double rounding is symptomatic of use of extended precision on x86. If
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we're seeing double rounding, and we don't have any mechanism available for
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changing the FPU rounding precision, then don't use Python/dtoa.c. */
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#if defined(X87_DOUBLE_ROUNDING) && !defined(HAVE_PY_SET_53BIT_PRECISION)
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#define PY_NO_SHORT_FLOAT_REPR
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# define PY_NO_SHORT_FLOAT_REPR
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#endif
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@ -13,10 +13,10 @@ double _Py_force_double(double x)
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}
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#endif
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#ifdef HAVE_GCC_ASM_FOR_X87
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/* inline assembly for getting and setting the 387 FPU control word on
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gcc/x86 */
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#ifdef HAVE_GCC_ASM_FOR_X87
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// Inline assembly for getting and setting the 387 FPU control word on
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// GCC/x86.
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#ifdef _Py_MEMORY_SANITIZER
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__attribute__((no_sanitize_memory))
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#endif
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@ -29,8 +29,7 @@ unsigned short _Py_get_387controlword(void) {
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void _Py_set_387controlword(unsigned short cw) {
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__asm__ __volatile__ ("fldcw %0" : : "m" (cw));
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}
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#endif
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#endif // HAVE_GCC_ASM_FOR_X87
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#ifndef HAVE_HYPOT
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@ -2,6 +2,7 @@
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#include <Python.h>
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#include "pycore_dtoa.h"
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#include "pycore_pymath.h" // _Py_SET_53BIT_PRECISION_START
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#include <locale.h>
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/* Case-insensitive string match used for nan and inf detection; t should be
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