ashrdi3.c

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/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include "gcclib.h"

#ifdef CONFIG_ARITHMETIC_OPS_L1
DItype __ashrdi3(DItype u, word_type b)__attribute__((l1_text));
#endif

DItype __ashrdi3(DItype u, word_type b)
{
    DIunion w;
    word_type bm;
    DIunion uu;

    if (b == 0)
        return u;

    uu.ll = u;

    bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
    if (bm <= 0) {
        /* w.s.high = 1..1 or 0..0 */
        w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
        w.s.low = uu.s.high >> -bm;
    } else {
        USItype carries = (USItype) uu.s.high << bm;
        w.s.high = uu.s.high >> b;
        w.s.low = ((USItype) uu.s.low >> b) | carries;
    }

    return w.ll;
}