43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is distributed under the University of Illinois Open Source
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* License. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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*
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* This file implements __fixunsdfsi for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "int_lib.h"
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/* Returns: convert a to a unsigned int, rounding toward zero.
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* Negative values all become zero.
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*/
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/* Assumption: double is a IEEE 64 bit floating point type
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* su_int is a 32 bit integral type
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* value in double is representable in su_int or is negative
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* (no range checking performed)
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*/
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/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
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su_int
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__fixunsdfsi(double a)
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{
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double_bits fb;
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fb.f = a;
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int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
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if (e < 0 || (fb.u.s.high & 0x80000000))
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return 0;
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return (
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0x80000000u |
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((fb.u.s.high & 0x000FFFFF) << 11) |
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(fb.u.s.low >> 21)
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) >> (31 - e);
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}
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