diff options
Diffstat (limited to 'lib/mulosi4.c')
-rw-r--r-- | lib/mulosi4.c | 58 |
1 files changed, 0 insertions, 58 deletions
diff --git a/lib/mulosi4.c b/lib/mulosi4.c deleted file mode 100644 index f3398d1fc7bd..000000000000 --- a/lib/mulosi4.c +++ /dev/null @@ -1,58 +0,0 @@ -/*===-- mulosi4.c - Implement __mulosi4 -----------------------------------=== - * - * 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 __mulosi4 for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ - -#include "int_lib.h" - -/* Returns: a * b */ - -/* Effects: sets *overflow to 1 if a * b overflows */ - -si_int -__mulosi4(si_int a, si_int b, int* overflow) -{ - const int N = (int)(sizeof(si_int) * CHAR_BIT); - const si_int MIN = (si_int)1 << (N-1); - const si_int MAX = ~MIN; - *overflow = 0; - si_int result = a * b; - if (a == MIN) - { - if (b != 0 && b != 1) - *overflow = 1; - return result; - } - if (b == MIN) - { - if (a != 0 && a != 1) - *overflow = 1; - return result; - } - si_int sa = a >> (N - 1); - si_int abs_a = (a ^ sa) - sa; - si_int sb = b >> (N - 1); - si_int abs_b = (b ^ sb) - sb; - if (abs_a < 2 || abs_b < 2) - return result; - if (sa == sb) - { - if (abs_a > MAX / abs_b) - *overflow = 1; - } - else - { - if (abs_a > MIN / -abs_b) - *overflow = 1; - } - return result; -} |