diff options
Diffstat (limited to 'lib/mulvsi3.c')
-rw-r--r-- | lib/mulvsi3.c | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/lib/mulvsi3.c b/lib/mulvsi3.c deleted file mode 100644 index d372b20175ed..000000000000 --- a/lib/mulvsi3.c +++ /dev/null @@ -1,56 +0,0 @@ -/* ===-- mulvsi3.c - Implement __mulvsi3 -----------------------------------=== - * - * 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 __mulvsi3 for the compiler_rt library. - * - * ===----------------------------------------------------------------------=== - */ - -#include "int_lib.h" - -/* Returns: a * b */ - -/* Effects: aborts if a * b overflows */ - -si_int -__mulvsi3(si_int a, si_int b) -{ - const int N = (int)(sizeof(si_int) * CHAR_BIT); - const si_int MIN = (si_int)1 << (N-1); - const si_int MAX = ~MIN; - if (a == MIN) - { - if (b == 0 || b == 1) - return a * b; - compilerrt_abort(); - } - if (b == MIN) - { - if (a == 0 || a == 1) - return a * b; - compilerrt_abort(); - } - 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 a * b; - if (sa == sb) - { - if (abs_a > MAX / abs_b) - compilerrt_abort(); - } - else - { - if (abs_a > MIN / -abs_b) - compilerrt_abort(); - } - return a * b; -} |