44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
#include <fenv.h>
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#include <float.h>
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/* 7.6.4.3
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The fesetenv function establishes the floating-point environment
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represented by the object pointed to by envp. The argument envp
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points to an object set by a call to fegetenv or feholdexcept, or
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equal the macro FE_DFL_ENV or an implementation-defined environment
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macro. Note that fesetenv merely installs the state of the exception
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flags represented through its argument, and does not raise these
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exceptions.
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*/
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extern void (*_imp___fpreset)( void ) ;
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int fesetenv (const fenv_t * envp)
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{
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if (envp == FE_PC64_ENV)
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/*
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* fninit initializes the control register to 0x37f,
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* the status register to zero and the tag word to 0FFFFh.
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* The other registers are unaffected.
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*/
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__asm__ ("fninit");
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else if (envp == FE_PC53_ENV)
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/*
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* MS _fpreset() does same *except* it sets control word
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* to 0x27f (53-bit precison).
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* We force calling _fpreset in msvcrt.dll
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*/
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(*_imp___fpreset)();
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else if (envp == FE_DFL_ENV)
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/* Use the choice made at app startup */
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_fpreset();
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else
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__asm__ ("fldenv %0;" : : "m" (*envp));
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return 0;
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}
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