newlib/winsup/cygwin/math/rint.c

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/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <math.h>
#if defined(__arm__) || defined(_ARM_)
/* This works around a compiler bug */
double __rint_internal( double x );
asm(".def __rint_internal; .scl 2; .type 32; .endef\n"
"\t.text\n"
"\t.align 4\n"
"\t.globl __rint_internal\n"
"__rint_internal:\n"
"\tvcvtr.s32.f64 s0, d0\n"
"\tvcvt.f64.s32 d0, s0\n"
"\tbx lr");
#endif /* defined(__arm__) || defined(_ARM_) */
double rint (double x) {
double retval = 0.0;
#if defined(_AMD64_) || defined(__x86_64__) || defined(_X86_) || defined(__i386__)
__asm__ __volatile__ ("frndint;" : "=t" (retval) : "0" (x));
#elif defined(__arm__) || defined(_ARM_)
retval = __rint_internal(x);
#endif
return retval;
}