31 lines
983 B
C
31 lines
983 B
C
#include <fenv.h>
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#include "cpu_features.h"
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/* 7.6.4.2
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The feholdexcept function saves the current floating-point
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environment in the object pointed to by envp, clears the exception
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flags, and then installs a non-stop (continue on exceptions) mode,
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if available, for all exceptions. */
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int feholdexcept (fenv_t * envp)
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{
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__asm__ ("fnstenv %0;" : "=m" (* envp)); /* save current into envp */
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/* fnstenv sets control word to non-stop for all exceptions, so all we
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need to do is clear the exception flags. */
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__asm__ ("fnclex");
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if (__HAS_SSE)
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{
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unsigned int _csr;
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/* Save the SSE MXCSR register. */
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__asm__ ("stmxcsr %0" : "=m" (envp->__mxcsr));
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/* Clear the exception flags. */
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_csr = envp->__mxcsr & ~FE_ALL_EXCEPT;
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/* Set exception mask to non-stop */
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_csr |= (FE_ALL_EXCEPT << __MXCSR_EXCEPT_MASK_SHIFT) /*= 0x1f80 */;
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__asm__ volatile ("ldmxcsr %0" : : "m" (_csr));
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}
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return 0;
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}
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