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glibc  2.9
fesetenv.c File Reference
#include <fenv.h>
#include <shlib-compat.h>

Go to the source code of this file.


int __fesetenv (const fenv_t *envp)

Function Documentation

int __fesetenv ( const fenv_t envp)

Definition at line 24 of file fesetenv.c.

  fenv_t temp;

  /* Install the environment specified by ENVP.  But there are a few
     values which we do not want to come from the saved environment.
     Therefore, we get the current environment and replace the values
     we want to use from the environment specified by the parameter.  */
#ifdef __mcoldfire__
  __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (temp.__control_register));
  __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (temp.__status_register));
  __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (temp.__instruction_address));
  __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*&temp));

  temp.__status_register &= ~FE_ALL_EXCEPT;
  temp.__control_register &= ~((FE_ALL_EXCEPT << 6) | FE_UPWARD);
  if (envp == FE_DFL_ENV)
  else if (envp == FE_NOMASK_ENV)
    temp.__control_register |= FE_ALL_EXCEPT << 6;
      temp.__control_register |= (envp->__control_register
                              & ((FE_ALL_EXCEPT << 6) | FE_UPWARD));
      temp.__status_register |= envp->__status_register & FE_ALL_EXCEPT;

#ifdef __mcoldfire__
  __asm__ __volatile__ ("fmove%.l %0,%/fpiar"
                     :: "dm" (temp.__instruction_address));
  __asm__ __volatile__ ("fmove%.l %0,%/fpcr"
                     :: "dm" (temp.__control_register));
  __asm__ __volatile__ ("fmove%.l %0,%/fpsr"
                     :: "dm" (temp.__status_register));
  __asm__ __volatile__ ("fmovem%.l %0,%/fpcr/%/fpsr/%/fpiar" : : "m" (*&temp));

  /* Success.  */
  return 0;

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