diff options
Diffstat (limited to 'compiler-rt/lib/builtins/mulvti3.c')
| -rw-r--r-- | compiler-rt/lib/builtins/mulvti3.c | 61 |
1 files changed, 27 insertions, 34 deletions
diff --git a/compiler-rt/lib/builtins/mulvti3.c b/compiler-rt/lib/builtins/mulvti3.c index 3972d1725ee..b8033d5d340 100644 --- a/compiler-rt/lib/builtins/mulvti3.c +++ b/compiler-rt/lib/builtins/mulvti3.c @@ -19,41 +19,34 @@ /* Effects: aborts if a * b overflows */ -COMPILER_RT_ABI ti_int -__mulvti3(ti_int a, ti_int b) -{ - const int N = (int)(sizeof(ti_int) * CHAR_BIT); - const ti_int MIN = (ti_int)1 << (N-1); - const ti_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(); - } - ti_int sa = a >> (N - 1); - ti_int abs_a = (a ^ sa) - sa; - ti_int sb = b >> (N - 1); - ti_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(); - } +COMPILER_RT_ABI ti_int __mulvti3(ti_int a, ti_int b) { + const int N = (int)(sizeof(ti_int) * CHAR_BIT); + const ti_int MIN = (ti_int)1 << (N - 1); + const ti_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(); + } + ti_int sa = a >> (N - 1); + ti_int abs_a = (a ^ sa) - sa; + ti_int sb = b >> (N - 1); + ti_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; } #endif /* CRT_HAS_128BIT */ |
