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39 lines
1 KiB
C
39 lines
1 KiB
C
/*
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* PROJECT: ReactOS CRT
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: Implementation of _control87
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* COPYRIGHT: Copyright 2022 Timo Kreuzer <timo.kreuzer@reactos.org>
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*/
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#include <xmmintrin.h>
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#include <float.h>
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unsigned int _get_native_fpcw(void);
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void _set_native_fpcw(unsigned int value);
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unsigned int _fpcw_native_to_abstract(unsigned int native);
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unsigned int _fpcw_abstract_to_native(unsigned int abstract);
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unsigned int __cdecl _control87(unsigned int newval, unsigned int mask)
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{
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unsigned int native, oldval, updated;
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/* Sanatize the mask */
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mask &= _MCW_DN | _MCW_EM | _MCW_RC;
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/* Get native control word */
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native = _get_native_fpcw();
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/* Convert to abstract */
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oldval = _fpcw_native_to_abstract(native);
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/* Update it according to the given parameters */
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updated = (oldval & ~mask) | (newval & mask);
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/* Convert back to native */
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native = _fpcw_abstract_to_native(updated);
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/* Set the native value */
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_set_native_fpcw(native);
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return updated;
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}
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