blob: d16dd65529c9af584a887cc8ceb9a545507d8f85 [file] [log] [blame]
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
#include <_mingw.h>
#include <fenv.h>
#include <float.h>
#if !(defined(_ARM_) || defined(__arm__))
extern int __mingw_has_sse (void);
#endif /* !(defined(_ARM_) || defined(__arm__)) */
The fesetenv function establishes the floating-point environment
represented by the object pointed to by envp. The argument envp
points to an object set by a call to fegetenv or feholdexcept, or
equal the macro FE_DFL_ENV or an implementation-defined environment
macro. Note that fesetenv merely installs the state of the exception
flags represented through its argument, and does not raise these
extern void (* __MINGW_IMP_SYMBOL(_fpreset))(void);
extern void _fpreset(void);
int fesetenv (const fenv_t * envp)
#if defined(_ARM_) || defined(__arm__)
if (envp == FE_DFL_ENV)
/* Use the choice made at app startup */
__asm__ volatile ("fmxr FPSCR, %0" : : "r" (*envp));
if (envp == FE_PC64_ENV)
* fninit initializes the control register to 0x37f,
* the status register to zero and the tag word to 0FFFFh.
* The other registers are unaffected.
__asm__ __volatile__ ("fninit");
else if (envp == FE_PC53_ENV)
* MS _fpreset() does same *except* it sets control word
* to 0x27f (53-bit precison).
* We force calling _fpreset in msvcrt.dll
(* __MINGW_IMP_SYMBOL(_fpreset))();
else if (envp == FE_DFL_ENV)
/* Use the choice made at app startup */
fenv_t env = *envp;
int _mxcsr;
__asm__ ("fnstenv %0\n"
"stmxcsr %1" : "=m" (*&env), "=m" (*&_mxcsr));
/*_mxcsr = ((int)envp->__unused0 << 16) | (int)envp->__unused1; *//* mxcsr low and high */
env.__unused0 = 0xffff;
env.__unused1 = 0xffff;
__asm__ volatile ("fldenv %0" : : "m" (env)
: "st", "st(1)", "st(2)", "st(3)", "st(4)",
"st(5)", "st(6)", "st(7)");
if (__mingw_has_sse ())
__asm__ volatile ("ldmxcsr %0" : : "m" (*&_mxcsr));
#endif /* defined(_ARM_) || defined(__arm__) */
return 0;