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25 lines
915 B
C
Vendored
25 lines
915 B
C
Vendored
/**
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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 <math.h>
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long double
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truncl (long double _x)
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{
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#if __SIZEOF_LONG_DOUBLE__ == __SIZEOF_DOUBLE__
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return trunc(_x);
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#else
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long double retval = 0.0L;
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unsigned short saved_cw;
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unsigned short tmp_cw;
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__asm__ __volatile__ ("fnstcw %0;" : "=m" (saved_cw)); /* save FPU control word */
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tmp_cw = saved_cw | 0xc00; /* round towards zero */
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__asm__ __volatile__ ("fldcw %0;" : : "m" (tmp_cw));
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__asm__ __volatile__ ("frndint;" : "=t" (retval) : "0" (_x)); /* round towards zero */
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__asm__ __volatile__ ("fldcw %0;" : : "m" (saved_cw) ); /* restore saved control word */
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return retval;
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#endif /* defined(_ARM_) || defined(__arm__) || defined(_ARM64_) || defined(__aarch64__) */
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}
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