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# define XPFPA_HAVE_CW 1 # define XPFPA_CW_DATATYPE \ unsigned int # define XPFPA_STORE_CW(vptr) do { \ _controlfp_s((unsigned int *)(vptr), 0, 0); \ } while (0) # define XPFPA_RESTORE_CW(vptr) do { \ unsigned int _xpfpa_fpu_cw; \ _controlfp_s(&_xpfpa_fpu_cw, *((unsigned int *)(vptr)), _MCW_PC); \ } while (0) # define XPFPA_DECLARE \ unsigned int _xpfpa_fpu_oldcw, _xpfpa_fpu_cw; # define XPFPA_SWITCH_DOUBLE() do { \ _controlfp_s(&_xpfpa_fpu_cw, 0, 0); \ _xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \ _controlfp_s(&_xpfpa_fpu_cw, _PC_53, _MCW_PC); \ } while (0) # define XPFPA_SWITCH_SINGLE() do { \ _controlfp_s(&_xpfpa_fpu_cw, 0, 0); \ _xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \ _controlfp_s(&_xpfpa_fpu_cw, _PC_24, _MCW_PC); \ } while (0) /* NOTE: This only sets internal precision. MSVC does NOT support double- extended precision! */ # define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \ _controlfp_s(&_xpfpa_fpu_cw, 0, 0); \ _xpfpa_fpu_oldcw = _xpfpa_fpu_cw; \ _controlfp_s(&_xpfpa_fpu_cw, _PC_64, _MCW_PC); \ } while (0) # define XPFPA_RESTORE() \ _controlfp_s(&_xpfpa_fpu_cw, _xpfpa_fpu_oldcw, _MCW_PC) /* We do NOT use the volatile return trick since _controlfp_s is a function call and thus FP registers are saved in memory anyway. However, we do use a variable to ensure that the expression passed into val will be evaluated *before* switching back contexts. */ # define XPFPA_RETURN_DOUBLE(val) \ do { \ double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_SINGLE(val) \ do { \ float _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) /* This won't work, but we add a macro for it anyway. */ # define XPFPA_RETURN_DOUBLE_EXTENDED(val) \ do { \ long double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) #elif defined(HAVE__CONTROLFP) /* float.h defines _controlfp */ # include # define XPFPA_DECLARE \ unsigned int _xpfpa_fpu_oldcw; # define XPFPA_HAVE_CW 1 # define XPFPA_CW_DATATYPE \ unsigned int # define XPFPA_STORE_CW(vptr) do { \ *((unsigned int *)(vptr)) = _controlfp(0, 0); \ } while (0) # define XPFPA_RESTORE_CW(vptr) do { \ _controlfp(*((unsigned int *)(vptr)), _MCW_PC); \ } while (0) # define XPFPA_SWITCH_DOUBLE() do { \ _xpfpa_fpu_oldcw = _controlfp(0, 0); \ _controlfp(_PC_53, _MCW_PC); \ } while (0) # define XPFPA_SWITCH_SINGLE() do { \ _xpfpa_fpu_oldcw = _controlfp(0, 0); \ _controlfp(_PC_24, _MCW_PC); \ } while (0) /* NOTE: This will only work as expected on MinGW. */ # define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \ _xpfpa_fpu_oldcw = _controlfp(0, 0); \ _controlfp(_PC_64, _MCW_PC); \ } while (0) # define XPFPA_RESTORE() \ _controlfp(_xpfpa_fpu_oldcw, _MCW_PC) /* We do NOT use the volatile return trick since _controlfp is a function call and thus FP registers are saved in memory anyway. However, we do use a variable to ensure that the expression passed into val will be evaluated *before* switching back contexts. */ # define XPFPA_RETURN_DOUBLE(val) \ do { \ double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_SINGLE(val) \ do { \ float _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) /* This will only work on MinGW */ # define XPFPA_RETURN_DOUBLE_EXTENDED(val) \ do { \ long double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) #elif defined(HAVE__FPU_SETCW) /* glibc systems */ /* fpu_control.h defines _FPU_[GS]ETCW */ # include # define XPFPA_DECLARE \ fpu_control_t _xpfpa_fpu_oldcw, _xpfpa_fpu_cw; # define XPFPA_HAVE_CW 1 # define XPFPA_CW_DATATYPE \ fpu_control_t # define XPFPA_STORE_CW(vptr) do { \ _FPU_GETCW((*((fpu_control_t *)(vptr)))); \ } while (0) # define XPFPA_RESTORE_CW(vptr) do { \ _FPU_SETCW((*((fpu_control_t *)(vptr)))); \ } while (0) # define XPFPA_SWITCH_DOUBLE() do { \ _FPU_GETCW(_xpfpa_fpu_oldcw); \ _xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_SINGLE) | _FPU_DOUBLE; \ _FPU_SETCW(_xpfpa_fpu_cw); \ } while (0) # define XPFPA_SWITCH_SINGLE() do { \ _FPU_GETCW(_xpfpa_fpu_oldcw); \ _xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_EXTENDED & ~_FPU_DOUBLE) | _FPU_SINGLE; \ _FPU_SETCW(_xpfpa_fpu_cw); \ } while (0) # define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \ _FPU_GETCW(_xpfpa_fpu_oldcw); \ _xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~_FPU_SINGLE & ~_FPU_DOUBLE) | _FPU_EXTENDED; \ _FPU_SETCW(_xpfpa_fpu_cw); \ } while (0) # define XPFPA_RESTORE() \ _FPU_SETCW(_xpfpa_fpu_oldcw) /* We use a temporary volatile variable (in a new block) in order to ensure that the optimizer does not mis-optimize the instructions. Also, a volatile variable ensures truncation to correct precision. */ # define XPFPA_RETURN_DOUBLE(val) \ do { \ volatile double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_SINGLE(val) \ do { \ volatile float _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_DOUBLE_EXTENDED(val) \ do { \ volatile long double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) #elif defined(HAVE_FPSETPREC) /* FreeBSD */ /* fpu_control.h defines _FPU_[GS]ETCW */ # include # define XPFPA_DECLARE \ fp_prec_t _xpfpa_fpu_oldprec; # define XPFPA_HAVE_CW 1 # define XPFPA_CW_DATATYPE \ fp_prec_t # define XPFPA_STORE_CW(vptr) do { \ *((fp_prec_t *)(vptr)) = fpgetprec(); \ } while (0) # define XPFPA_RESTORE_CW(vptr) do { \ fpsetprec(*((fp_prec_t *)(vptr))); \ } while (0) # define XPFPA_SWITCH_DOUBLE() do { \ _xpfpa_fpu_oldprec = fpgetprec(); \ fpsetprec(FP_PD); \ } while (0) # define XPFPA_SWITCH_SINGLE() do { \ _xpfpa_fpu_oldprec = fpgetprec(); \ fpsetprec(FP_PS); \ } while (0) # define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \ _xpfpa_fpu_oldprec = fpgetprec(); \ fpsetprec(FP_PE); \ } while (0) # define XPFPA_RESTORE() \ fpsetprec(_xpfpa_fpu_oldprec) /* We use a temporary volatile variable (in a new block) in order to ensure that the optimizer does not mis-optimize the instructions. Also, a volatile variable ensures truncation to correct precision. */ # define XPFPA_RETURN_DOUBLE(val) \ do { \ volatile double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_SINGLE(val) \ do { \ volatile float _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_DOUBLE_EXTENDED(val) \ do { \ volatile long double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) #elif defined(HAVE_FPU_INLINE_ASM_X86) /* Custom x86 inline assembler implementation. This implementation does not use predefined wrappers of the OS / compiler but rather uses x86/x87 inline assembler directly. Basic instructions: fnstcw - Store the FPU control word in a variable fldcw - Load the FPU control word from a variable Bits (only bits 8 and 9 are relevant, bits 0 to 7 are for other things): 0x0yy: Single precision 0x1yy: Reserved 0x2yy: Double precision 0x3yy: Double-extended precision We use an unsigned int for the datatype. glibc sources add __mode__ (__HI__) attribute to it (HI stands for half-integer according to docs). It is unclear what the does exactly and how portable it is. The assembly syntax works with GNU CC, Intel CC and Sun CC. */ # define XPFPA_DECLARE \ unsigned int _xpfpa_fpu_oldcw, _xpfpa_fpu_cw; # define XPFPA_HAVE_CW 1 # define XPFPA_CW_DATATYPE \ unsigned int # define XPFPA_STORE_CW(vptr) do { \ __asm__ __volatile__ ("fnstcw %0" : "=m" (*((unsigned int *)(vptr)))); \ } while (0) # define XPFPA_RESTORE_CW(vptr) do { \ __asm__ __volatile__ ("fldcw %0" : : "m" (*((unsigned int *)(vptr)))); \ } while (0) # define XPFPA_SWITCH_DOUBLE() do { \ __asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \ _xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~0x100) | 0x200; \ __asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \ } while (0) # define XPFPA_SWITCH_SINGLE() do { \ __asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \ _xpfpa_fpu_cw = (_xpfpa_fpu_oldcw & ~0x300); \ __asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \ } while (0) # define XPFPA_SWITCH_DOUBLE_EXTENDED() do { \ __asm__ __volatile__ ("fnstcw %0" : "=m" (*&_xpfpa_fpu_oldcw)); \ _xpfpa_fpu_cw = _xpfpa_fpu_oldcw | 0x300; \ __asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_cw)); \ } while (0) # define XPFPA_RESTORE() \ __asm__ __volatile__ ("fldcw %0" : : "m" (*&_xpfpa_fpu_oldcw)) /* We use a temporary volatile variable (in a new block) in order to ensure that the optimizer does not mis-optimize the instructions. Also, a volatile variable ensures truncation to correct precision. */ # define XPFPA_RETURN_DOUBLE(val) \ do { \ volatile double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_SINGLE(val) \ do { \ volatile float _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) # define XPFPA_RETURN_DOUBLE_EXTENDED(val) \ do { \ volatile long double _xpfpa_result = (val); \ XPFPA_RESTORE(); \ return _xpfpa_result; \ } while (0) #else /* FPU CONTROL */ /* This is either not an x87 FPU or the inline assembly syntax was not recognized. In any case, default to NOPs for the macros and hope the generated code will behave as planned. */ # define XPFPA_DECLARE /* NOP */ # define XPFPA_HAVE_CW 0 # define XPFPA_CW_DATATYPE unsigned int # define XPFPA_STORE_CW(variable) /* NOP */ # define XPFPA_RESTORE_CW(variable) /* NOP */ # define XPFPA_SWITCH_DOUBLE() /* NOP */ # define XPFPA_SWITCH_SINGLE() /* NOP */ # define XPFPA_SWITCH_DOUBLE_EXTENDED() /* NOP */ # define XPFPA_RESTORE() /* NOP */ # define XPFPA_RETURN_DOUBLE(val) return (val) # define XPFPA_RETURN_SINGLE(val) return (val) # define XPFPA_RETURN_DOUBLE_EXTENDED(val) return (val) #endif /* FPU CONTROL */ #endif