cpython/Python/pymath.c

#include "Python.h"


#ifdef HAVE_GCC_ASM_FOR_X87
// Inline assembly for getting and setting the 387 FPU control word on
// GCC/x86.
#ifdef _Py_MEMORY_SANITIZER
__attribute__((no_sanitize_memory))
#endif
unsigned short _Py_get_387controlword(void) {
    unsigned short cw;
    __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
    return cw;
}

void _Py_set_387controlword(unsigned short cw) {
    __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
}
#endif  // HAVE_GCC_ASM_FOR_X87
Merged revisions 62380,62382-62383 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r62380 \| christian.heimes \| 2008-04-19 01:13:07 +0200 (Sat, 19 Apr 2008) \| 3 lines I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. The patch also adds acosh, asinh, atanh, log1p and copysign to all platforms. Finally it fixes differences between platforms like different results or exceptions for edge cases. Have fun :) ........ r62382 \| christian.heimes \| 2008-04-19 01:40:40 +0200 (Sat, 19 Apr 2008) \| 2 lines Added new files to Windows project files More Windows related fixes are coming soon ........ r62383 \| christian.heimes \| 2008-04-19 01:49:11 +0200 (Sat, 19 Apr 2008) \| 1 line Stupid me. Py_RETURN_NAN should actually return something ... ........ 2008-04-19 08:31:39 +08:00			`#include "Python.h"`

Issue #1580: use short float repr where possible. - incorporate and adapt David Gay's dtoa and strtod into the Python core - on platforms where we can use Gay's code (almost all!), repr(float) is based on the shortest sequence of decimal digits that rounds correctly. - add sys.float_repr_style attribute to indicate whether we're using Gay's code or not - add autoconf magic to detect and enable SSE2 instructions on x86/gcc - slight change to repr and str: repr switches to exponential notation at 1e16 instead of 1e17, str switches at 1e11 instead of 1e12 2009-04-17 03:52:09 +08:00
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. 2021-10-12 05:09:40 +08:00			`#ifdef HAVE_GCC_ASM_FOR_X87`
			`// Inline assembly for getting and setting the 387 FPU control word on`
			`// GCC/x86.`
bpo-35214: Add _Py_ prefix to MEMORY_SANITIZER def. (GH-10503) Rename our new MEMORY_SANITIZER define to _Py_MEMORY_SANITIZER. Project based C Preprocessor namespacing at its finest. :P 2018-11-13 14:01:22 +08:00			`#ifdef _Py_MEMORY_SANITIZER`
bpo-35214: Initial clang MemorySanitizer support (GH-10479) Adds configure flags for msan and ubsan builds to make it easier to enable. These also encode the detail that address sanitizer and memory sanitizer should disable pymalloc. Define MEMORY_SANITIZER when appropriate at build time and adds workarounds to existing code to mark things as initialized where the sanitizer is otherwise unable to determine that. This lets our build succeed under the memory sanitizer. not all tests pass without sanitizer failures yet but we're in pretty good shape after this. 2018-11-13 04:07:14 +08:00			`__attribute__((no_sanitize_memory))`
			`#endif`
Issue #1580: use short float repr where possible. - incorporate and adapt David Gay's dtoa and strtod into the Python core - on platforms where we can use Gay's code (almost all!), repr(float) is based on the shortest sequence of decimal digits that rounds correctly. - add sys.float_repr_style attribute to indicate whether we're using Gay's code or not - add autoconf magic to detect and enable SSE2 instructions on x86/gcc - slight change to repr and str: repr switches to exponential notation at 1e16 instead of 1e17, str switches at 1e11 instead of 1e12 2009-04-17 03:52:09 +08:00			`unsigned short _Py_get_387controlword(void) {`
			`unsigned short cw;`
			`__asm__ __volatile__ ("fnstcw %0" : "=m" (cw));`
			`return cw;`
			`}`

			`void _Py_set_387controlword(unsigned short cw) {`
			`__asm__ __volatile__ ("fldcw %0" : : "m" (cw));`
			`}`
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. 2021-10-12 05:09:40 +08:00			`#endif // HAVE_GCC_ASM_FOR_X87`