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
58 lines
2.0 KiB
C
58 lines
2.0 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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#if !(defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__))
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int __mingw_has_sse (void);
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#endif /* !(defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__)) */
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/* 7.6.3.2
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The fesetround function establishes the rounding direction
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represented by its argument round. If the argument is not equal
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to the value of a rounding direction macro, the rounding direction
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is not changed. */
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int fesetround (int mode)
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{
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#if defined(_ARM_) || defined(__arm__)
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fenv_t _env;
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if ((mode & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)) != 0)
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return -1;
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__asm__ volatile ("fmrx %0, FPSCR" : "=r" (_env));
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_env.__cw &= ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO);
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_env.__cw |= mode;
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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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if ((mode & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)) != 0)
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return -1;
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__asm__ volatile ("mrs %0, fpcr" : "=r" (fpcr));
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fpcr &= ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO);
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fpcr |= mode;
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__asm__ volatile ("msr fpcr, %0" : : "r" (fpcr));
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#else
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unsigned short _cw;
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if ((mode & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO))
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!= 0)
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return -1;
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__asm__ volatile ("fnstcw %0;": "=m" (*&_cw));
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_cw &= ~0xc00;
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_cw |= mode;
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__asm__ volatile ("fldcw %0;" : : "m" (*&_cw));
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if (__mingw_has_sse ())
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{
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int mxcsr;
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__asm__ volatile ("stmxcsr %0" : "=m" (*&mxcsr));
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mxcsr &= ~0x6000;
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mxcsr |= mode << 3;
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__asm__ volatile ("ldmxcsr %0" : : "m" (*&mxcsr));
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}
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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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