compiler-rt/lib/builtins/fixunsdfdi.c

/* ===-- fixunsdfdi.c - Implement __fixunsdfdi -----------------------------===
 *
 *                     The LLVM Compiler Infrastructure
 *
 * This file is dual licensed under the MIT and the University of Illinois Open
 * Source Licenses. See LICENSE.TXT for details.
 *
 * ===----------------------------------------------------------------------===
 */

#define DOUBLE_PRECISION
#include "fp_lib.h"

ARM_EABI_FNALIAS(d2ulz, fixunsdfdi)

#ifndef __SOFT_FP__
/* Support for systems that have hardware floating-point; can set the invalid
 * flag as a side-effect of computation.
 */

COMPILER_RT_ABI du_int
__fixunsdfdi(double a)
{
    if (a <= 0.0) return 0;
    su_int high = a / 4294967296.f;               /* a / 0x1p32f; */
    su_int low = a - (double)high * 4294967296.f; /* high * 0x1p32f; */
    return ((du_int)high << 32) | low;
}

#else
/* Support for systems that don't have hardware floating-point; there are no
 * flags to set, and we don't want to code-gen to an unknown soft-float
 * implementation.
 */

typedef du_int fixuint_t;
#include "fp_fixuint_impl.inc"

COMPILER_RT_ABI du_int
__fixunsdfdi(fp_t a) {
    return __fixuint(a);
}

#endif