diff options
Diffstat (limited to 'compiler-rt/lib/builtins/mulosi4.c')
| -rw-r--r-- | compiler-rt/lib/builtins/mulosi4.c | 65 |
1 files changed, 29 insertions, 36 deletions
diff --git a/compiler-rt/lib/builtins/mulosi4.c b/compiler-rt/lib/builtins/mulosi4.c index 1732da210c2..7db178ac08f 100644 --- a/compiler-rt/lib/builtins/mulosi4.c +++ b/compiler-rt/lib/builtins/mulosi4.c @@ -17,41 +17,34 @@ /* Effects: sets *overflow to 1 if a * b overflows */ -COMPILER_RT_ABI 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; - } +COMPILER_RT_ABI 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; } |

