49d1a4c562
also start prefering NtDll API. so far: * NtQueryInformationFile * NtClose adds a performance workaround for windows unicode conversion. but that should probably be removed before merging
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <fenv.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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#if defined(_ARM_) || defined(__arm__)
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fenv_t _env;
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__asm__ volatile ("fmrx %0, FPSCR" : "=r" (_env));
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envp->__cw = _env.__cw;
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_env.__cw &= ~(FE_ALL_EXCEPT);
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__asm__ volatile ("fmxr FPSCR, %0" : : "r" (_env));
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#elif defined(_ARM64_) || defined(__aarch64__)
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unsigned __int64 fpcr;
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__asm__ volatile ("mrs %0, fpcr" : "=r" (fpcr));
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envp->__cw = fpcr;
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fpcr &= ~(FE_ALL_EXCEPT);
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__asm__ volatile ("msr fpcr, %0" : : "r" (fpcr));
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#else
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__asm__ __volatile__ ("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__ __volatile__ ("fnclex");
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#endif /* defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__) */
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return 0;
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}
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