llvm-project/compiler-rt/lib/cmpdi2.c

/* ===-- cmpdi2.c - Implement __cmpdi2 -------------------------------------===
 *
 *                     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.
 *
 * ===----------------------------------------------------------------------===
 *
 * This file implements __cmpdi2 for the compiler_rt library.
 *
 * ===----------------------------------------------------------------------===
 */

#include "int_lib.h"

/* Returns: if (a <  b) returns 0
*           if (a == b) returns 1
*           if (a >  b) returns 2
*/

COMPILER_RT_ABI si_int
__cmpdi2(di_int a, di_int b)
{
    dwords x;
    x.all = a;
    dwords y;
    y.all = b;
    if (x.s.high < y.s.high)
        return 0;
    if (x.s.high > y.s.high)
        return 2;
    if (x.s.low < y.s.low)
        return 0;
    if (x.s.low > y.s.low)
        return 2;
    return 1;
}

#ifdef __ARM_EABI__
/* Returns: if (a <  b) returns -1
*           if (a == b) returns  0
*           if (a >  b) returns  1
*/
COMPILER_RT_ABI si_int
__aeabi_lcmp(di_int a, di_int b)
{
	return __cmpdi2(a, b) - 1;
}
#endif