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Cf. <https://github.com/php/php-src/pull/10220#issuecomment-1383739816>. This reverts commit45a128c9de. This reverts commit1eb71c3f15. This reverts commit492523a779. This reverts commitc7a4633891. This reverts commit308adb915c. This reverts commitcd27d5e07f. This reverts commitc5933409b4. This reverts commit46371f4eb3. This reverts commit623e2e9fc6. This reverts commite7434c1247. This reverts commitd28d323ca2. This reverts commit1a067b84ee. This reverts commita55c0c5fc3. This reverts commitb5aeb3a4d4. This reverts commitf061a035e4. This reverts commitb088575119. This reverts commitb1d48774a7. This reverts commit94f9a20ce6. This reverts commit4831e48708. This reverts commitcd985de190. This reverts commit9521d21681. This reverts commitd6136151e9.
416 lines
15 KiB
C
416 lines
15 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Christian Seiler <chris_se@gmx.net> |
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+----------------------------------------------------------------------+
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*/
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#ifndef ZEND_FLOAT_H
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#define ZEND_FLOAT_H
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BEGIN_EXTERN_C()
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/*
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Define functions for FP initialization and de-initialization.
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*/
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extern ZEND_API void zend_init_fpu(void);
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extern ZEND_API void zend_shutdown_fpu(void);
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extern ZEND_API void zend_ensure_fpu_mode(void);
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END_EXTERN_C()
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/* Copy of the contents of xpfpa.h (which is under public domain)
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See http://wiki.php.net/rfc/rounding for details.
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Cross Platform Floating Point Arithmetics
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This header file defines several platform-dependent macros that ensure
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equal and deterministic floating point behaviour across several platforms,
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compilers and architectures.
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The current macros are currently only used on x86 and x86_64 architectures,
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on every other architecture, these macros expand to NOPs. This assumes that
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other architectures do not have an internal precision and the operhand types
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define the computational precision of floating point operations. This
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assumption may be false, in that case, the author is interested in further
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details on the other platform.
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For further details, please visit:
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http://www.christian-seiler.de/projekte/fpmath/
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Version: 20090317 */
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/*
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Implementation notes:
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x86_64:
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- Since all x86_64 compilers use SSE by default, we do not define these
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macros there. We ignore the compiler option -mfpmath=i387, because there is
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no reason to use it on x86_64.
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General:
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- It would be nice if one could detect whether SSE if used for math via some
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funky compiler defines and if so, make the macros go to NOPs. Any ideas
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on how to do that?
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MS Visual C:
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- Since MSVC users typically don't use autoconf or CMake, we will detect
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MSVC via compile time define.
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*/
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/* MSVC detection (MSVC people usually don't use autoconf) */
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#if defined(_MSC_VER) && !defined(_WIN64)
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# define HAVE__CONTROLFP_S
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#endif /* _MSC_VER */
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#if defined(HAVE__CONTROLFP_S) && !defined(__x86_64__)
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/* float.h defines _controlfp_s */
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# include <float.h>
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# define XPFPA_HAVE_CW 1
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# define XPFPA_CW_DATATYPE \
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unsigned int
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# define XPFPA_STORE_CW(vptr) do { \
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_controlfp_s((unsigned int *)(vptr), 0, 0); \
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} while (0)
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# define XPFPA_RESTORE_CW(vptr) do { \
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unsigned int _xpfpa_fpu_cw; \
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_controlfp_s(&_xpfpa_fpu_cw, *((unsigned int *)(vptr)), _MCW_PC); \
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} while (0)
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# define XPFPA_DECLARE \
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unsigned int _xpfpa_fpu_oldcw, _xpfpa_fpu_cw;
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# define XPFPA_SWITCH_DOUBLE() do { \
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_controlfp_s(&_xpfpa_fpu_cw, 0, 0); \
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_xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \
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_controlfp_s(&_xpfpa_fpu_cw, _PC_53, _MCW_PC); \
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} while (0)
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# define XPFPA_SWITCH_SINGLE() do { \
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_controlfp_s(&_xpfpa_fpu_cw, 0, 0); \
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_xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \
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_controlfp_s(&_xpfpa_fpu_cw, _PC_24, _MCW_PC); \
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} while (0)
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/* NOTE: This only sets internal precision. MSVC does NOT support double-
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extended precision! */
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \
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_controlfp_s(&_xpfpa_fpu_cw, 0, 0); \
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_xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \
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_controlfp_s(&_xpfpa_fpu_cw, _PC_64, _MCW_PC); \
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} while (0)
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# define XPFPA_RESTORE() \
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_controlfp_s(&_xpfpa_fpu_cw, _xpfpa_fpu_oldcw, _MCW_PC)
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/* We do NOT use the volatile return trick since _controlfp_s is a function
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call and thus FP registers are saved in memory anyway. However, we do use
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a variable to ensure that the expression passed into val will be evaluated
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*before* switching back contexts. */
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# define XPFPA_RETURN_DOUBLE(val) \
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do { \
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double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_SINGLE(val) \
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do { \
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float _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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/* This won't work, but we add a macro for it anyway. */
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) \
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do { \
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long double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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#elif defined(HAVE__CONTROLFP) && !defined(__x86_64__)
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/* float.h defines _controlfp */
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# include <float.h>
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# define XPFPA_DECLARE \
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unsigned int _xpfpa_fpu_oldcw;
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# define XPFPA_HAVE_CW 1
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# define XPFPA_CW_DATATYPE \
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unsigned int
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# define XPFPA_STORE_CW(vptr) do { \
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*((unsigned int *)(vptr)) = _controlfp(0, 0); \
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} while (0)
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# define XPFPA_RESTORE_CW(vptr) do { \
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_controlfp(*((unsigned int *)(vptr)), _MCW_PC); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE() do { \
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_xpfpa_fpu_oldcw = _controlfp(0, 0); \
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_controlfp(_PC_53, _MCW_PC); \
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} while (0)
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# define XPFPA_SWITCH_SINGLE() do { \
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_xpfpa_fpu_oldcw = _controlfp(0, 0); \
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_controlfp(_PC_24, _MCW_PC); \
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} while (0)
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/* NOTE: This will only work as expected on MinGW. */
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \
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_xpfpa_fpu_oldcw = _controlfp(0, 0); \
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_controlfp(_PC_64, _MCW_PC); \
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} while (0)
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# define XPFPA_RESTORE() \
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_controlfp(_xpfpa_fpu_oldcw, _MCW_PC)
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/* We do NOT use the volatile return trick since _controlfp is a function
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call and thus FP registers are saved in memory anyway. However, we do use
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a variable to ensure that the expression passed into val will be evaluated
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*before* switching back contexts. */
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# define XPFPA_RETURN_DOUBLE(val) \
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do { \
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double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_SINGLE(val) \
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do { \
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float _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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/* This will only work on MinGW */
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) \
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do { \
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long double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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#elif defined(HAVE__FPU_SETCW) && !defined(__x86_64__) /* glibc systems */
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/* fpu_control.h defines _FPU_[GS]ETCW */
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# include <fpu_control.h>
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# define XPFPA_DECLARE \
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fpu_control_t _xpfpa_fpu_oldcw, _xpfpa_fpu_cw;
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# define XPFPA_HAVE_CW 1
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# define XPFPA_CW_DATATYPE \
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fpu_control_t
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# define XPFPA_STORE_CW(vptr) do { \
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_FPU_GETCW((*((fpu_control_t *)(vptr)))); \
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} while (0)
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# define XPFPA_RESTORE_CW(vptr) do { \
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_FPU_SETCW((*((fpu_control_t *)(vptr)))); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE() do { \
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_FPU_GETCW(_xpfpa_fpu_oldcw); \
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_xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_SINGLE) | _FPU_DOUBLE; \
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_FPU_SETCW(_xpfpa_fpu_cw); \
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} while (0)
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# define XPFPA_SWITCH_SINGLE() do { \
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_FPU_GETCW(_xpfpa_fpu_oldcw); \
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_xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_DOUBLE) | _FPU_SINGLE; \
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_FPU_SETCW(_xpfpa_fpu_cw); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \
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_FPU_GETCW(_xpfpa_fpu_oldcw); \
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_xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_SINGLE & ~_FPU_DOUBLE) | _FPU_EXTENDED; \
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_FPU_SETCW(_xpfpa_fpu_cw); \
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} while (0)
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# define XPFPA_RESTORE() \
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_FPU_SETCW(_xpfpa_fpu_oldcw)
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/* We use a temporary volatile variable (in a new block) in order to ensure
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that the optimizer does not mis-optimize the instructions. Also, a volatile
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variable ensures truncation to correct precision. */
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# define XPFPA_RETURN_DOUBLE(val) \
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do { \
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volatile double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_SINGLE(val) \
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do { \
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volatile float _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) \
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do { \
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volatile long double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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#elif defined(HAVE_FPSETPREC) && !defined(__x86_64__) /* FreeBSD */
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/* fpu_control.h defines _FPU_[GS]ETCW */
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# include <machine/ieeefp.h>
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# define XPFPA_DECLARE \
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fp_prec_t _xpfpa_fpu_oldprec;
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# define XPFPA_HAVE_CW 1
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# define XPFPA_CW_DATATYPE \
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fp_prec_t
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# define XPFPA_STORE_CW(vptr) do { \
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*((fp_prec_t *)(vptr)) = fpgetprec(); \
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} while (0)
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# define XPFPA_RESTORE_CW(vptr) do { \
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fpsetprec(*((fp_prec_t *)(vptr))); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE() do { \
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_xpfpa_fpu_oldprec = fpgetprec(); \
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fpsetprec(FP_PD); \
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} while (0)
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# define XPFPA_SWITCH_SINGLE() do { \
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_xpfpa_fpu_oldprec = fpgetprec(); \
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fpsetprec(FP_PS); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \
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_xpfpa_fpu_oldprec = fpgetprec(); \
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fpsetprec(FP_PE); \
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} while (0)
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# define XPFPA_RESTORE() \
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fpsetprec(_xpfpa_fpu_oldprec)
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/* We use a temporary volatile variable (in a new block) in order to ensure
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that the optimizer does not mis-optimize the instructions. Also, a volatile
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variable ensures truncation to correct precision. */
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# define XPFPA_RETURN_DOUBLE(val) \
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do { \
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volatile double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_SINGLE(val) \
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do { \
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volatile float _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) \
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do { \
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volatile long double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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#elif defined(HAVE_FPU_INLINE_ASM_X86) && !defined(__x86_64__)
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/*
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Custom x86 inline assembler implementation.
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This implementation does not use predefined wrappers of the OS / compiler
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but rather uses x86/x87 inline assembler directly. Basic instructions:
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fnstcw - Store the FPU control word in a variable
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fldcw - Load the FPU control word from a variable
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Bits (only bits 8 and 9 are relevant, bits 0 to 7 are for other things):
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0x0yy: Single precision
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0x1yy: Reserved
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0x2yy: Double precision
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0x3yy: Double-extended precision
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We use an unsigned int for the datatype. glibc sources add __mode__ (__HI__)
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attribute to it (HI stands for half-integer according to docs). It is unclear
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what the does exactly and how portable it is.
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The assembly syntax works with GNU CC, Intel CC and Sun CC.
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*/
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# define XPFPA_DECLARE \
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unsigned int _xpfpa_fpu_oldcw, _xpfpa_fpu_cw;
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# define XPFPA_HAVE_CW 1
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# define XPFPA_CW_DATATYPE \
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unsigned int
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# define XPFPA_STORE_CW(vptr) do { \
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__asm__ __volatile__ ("fnstcw %0" : "=m" (*((unsigned int *)(vptr)))); \
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} while (0)
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# define XPFPA_RESTORE_CW(vptr) do { \
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__asm__ __volatile__ ("fldcw %0" : : "m" (*((unsigned int *)(vptr)))); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE() do { \
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__asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \
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_xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~0x100) | 0x200; \
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__asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \
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} while (0)
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# define XPFPA_SWITCH_SINGLE() do { \
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__asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \
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_xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~0x300); \
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__asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \
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} while (0)
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \
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__asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \
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_xpfpa_fpu_cw = _xpfpa_fpu_oldcw | 0x300; \
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__asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \
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} while (0)
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# define XPFPA_RESTORE() \
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__asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_oldcw))
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/* We use a temporary volatile variable (in a new block) in order to ensure
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that the optimizer does not mis-optimize the instructions. Also, a volatile
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variable ensures truncation to correct precision. */
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# define XPFPA_RETURN_DOUBLE(val) \
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do { \
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volatile double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_SINGLE(val) \
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do { \
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volatile float _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) \
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do { \
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volatile long double _xpfpa_result = (val); \
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XPFPA_RESTORE(); \
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return _xpfpa_result; \
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} while (0)
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#else /* FPU CONTROL */
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/*
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This is either not an x87 FPU or the inline assembly syntax was not
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recognized. In any case, default to NOPs for the macros and hope the
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generated code will behave as planned.
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*/
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# define XPFPA_DECLARE /* NOP */
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# define XPFPA_HAVE_CW 0
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# define XPFPA_CW_DATATYPE unsigned int
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# define XPFPA_STORE_CW(variable) /* NOP */
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# define XPFPA_RESTORE_CW(variable) /* NOP */
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# define XPFPA_SWITCH_DOUBLE() /* NOP */
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# define XPFPA_SWITCH_SINGLE() /* NOP */
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# define XPFPA_SWITCH_DOUBLE_EXTENDED() /* NOP */
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# define XPFPA_RESTORE() /* NOP */
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# define XPFPA_RETURN_DOUBLE(val) return (val)
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# define XPFPA_RETURN_SINGLE(val) return (val)
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# define XPFPA_RETURN_DOUBLE_EXTENDED(val) return (val)
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#endif /* FPU CONTROL */
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#endif
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