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bpo-45412: Move _Py_SET_53BIT_PRECISION_START to pycore_pymath.h (GH-28882)

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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 2021-10-11 23:09:40 +02:00 • committed by GitHub
parent a9fe1a8e5b
commit 7103356455
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 111 additions and 88 deletions
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91
Include/internal/pycore_pymath.h
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@ -74,6 +74,97 @@ static inline void _Py_ADJUST_ERANGE2(double x, double y)
#define _Py_InIntegralTypeRange(type, v) \
(_Py_IntegralTypeMin(type) <= v && v <= _Py_IntegralTypeMax(type))
//--- Implementation of the HAVE_PY_SET_53BIT_PRECISION macro -------------
//--- defined in pyport.h -------------------------------------------------
//
// Give appropriate definitions for the following three macros:
//
// _Py_SET_53BIT_PRECISION_HEADER : any variable declarations needed to
// use the two macros below.
// _Py_SET_53BIT_PRECISION_START : store original FPU settings, and
// set FPU to 53-bit precision/round-half-to-even
// _Py_SET_53BIT_PRECISION_END : restore original FPU settings
// Get and set x87 control word for gcc/x86
#ifdef HAVE_GCC_ASM_FOR_X87
// Functions defined in Python/pymath.c
extern unsigned short _Py_get_387controlword(void);
extern void _Py_set_387controlword(unsigned short);
#define _Py_SET_53BIT_PRECISION_HEADER \
unsigned short old_387controlword, new_387controlword
#define _Py_SET_53BIT_PRECISION_START \
do { \
old_387controlword = _Py_get_387controlword(); \
new_387controlword = (old_387controlword & ~0x0f00) | 0x0200; \
if (new_387controlword != old_387controlword) { \
_Py_set_387controlword(new_387controlword); \
} \
} while (0)
#define _Py_SET_53BIT_PRECISION_END \
do { \
if (new_387controlword != old_387controlword) { \
_Py_set_387controlword(old_387controlword); \
} \
} while (0)
#endif
// Get and set x87 control word for VisualStudio/x86.
// x87 is not supported in 64-bit or ARM.
#if defined(_MSC_VER) && !defined(_WIN64) && !defined(_M_ARM)
#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
#ifdef HAVE_GCC_ASM_FOR_MC68881
#define _Py_SET_53BIT_PRECISION_HEADER \
unsigned int old_fpcr, new_fpcr
#define _Py_SET_53BIT_PRECISION_START \
do { \
__asm__ ("fmove.l %%fpcr,%0" : "=g" (old_fpcr)); \
/* Set double precision / round to nearest. */ \
new_fpcr = (old_fpcr & ~0xf0) | 0x80; \
if (new_fpcr != old_fpcr) { \
__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (new_fpcr));\
} \
} while (0)
#define _Py_SET_53BIT_PRECISION_END \
do { \
if (new_fpcr != old_fpcr) { \
__asm__ volatile ("fmove.l %0,%%fpcr" : : "g" (old_fpcr)); \
} \
} while (0)
#endif
// Default definitions are empty
#ifndef _Py_SET_53BIT_PRECISION_HEADER
# define _Py_SET_53BIT_PRECISION_HEADER
# define _Py_SET_53BIT_PRECISION_START
# define _Py_SET_53BIT_PRECISION_END
#endif
#ifdef __cplusplus
}
#endif