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      1      1.1  joerg /* ===-- modti3.c - Implement __modti3 -------------------------------------===
      2      1.1  joerg  *
      3      1.1  joerg  *                     The LLVM Compiler Infrastructure
      4      1.1  joerg  *
      5      1.1  joerg  * This file is dual licensed under the MIT and the University of Illinois Open
      6      1.1  joerg  * Source Licenses. See LICENSE.TXT for details.
      7      1.1  joerg  *
      8      1.1  joerg  * ===----------------------------------------------------------------------===
      9      1.1  joerg  *
     10      1.1  joerg  * This file implements __modti3 for the compiler_rt library.
     11      1.1  joerg  *
     12      1.1  joerg  * ===----------------------------------------------------------------------===
     13      1.1  joerg  */
     14      1.1  joerg 
     15      1.1  joerg #include "int_lib.h"
     16      1.1  joerg 
     17      1.1  joerg #ifdef CRT_HAS_128BIT
     18      1.1  joerg 
     19      1.1  joerg /*Returns: a % b */
     20      1.1  joerg 
     21  1.1.1.2  joerg COMPILER_RT_ABI ti_int
     22      1.1  joerg __modti3(ti_int a, ti_int b)
     23      1.1  joerg {
     24      1.1  joerg     const int bits_in_tword_m1 = (int)(sizeof(ti_int) * CHAR_BIT) - 1;
     25      1.1  joerg     ti_int s = b >> bits_in_tword_m1;  /* s = b < 0 ? -1 : 0 */
     26      1.1  joerg     b = (b ^ s) - s;                   /* negate if s == -1 */
     27      1.1  joerg     s = a >> bits_in_tword_m1;         /* s = a < 0 ? -1 : 0 */
     28      1.1  joerg     a = (a ^ s) - s;                   /* negate if s == -1 */
     29  1.1.1.2  joerg     tu_int r;
     30  1.1.1.2  joerg     __udivmodti4(a, b, &r);
     31  1.1.1.2  joerg     return ((ti_int)r ^ s) - s;                /* negate if s == -1 */
     32      1.1  joerg }
     33      1.1  joerg 
     34      1.1  joerg #endif /* CRT_HAS_128BIT */
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