1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//===-- int_mulv_impl.inc - Implement __mulv[sdt]i3 ---------------*- C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Helper used by __mulvsi3, __mulvdi3 and __mulvti3.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
// Returns: a * b
// Effects: aborts if a * b overflows
static __inline fixint_t __mulvXi3(fixint_t a, fixint_t b) {
const int N = (int)(sizeof(fixint_t) * CHAR_BIT);
const fixint_t MIN = (fixint_t)((fixuint_t)1 << (N - 1));
const fixint_t 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();
}
fixint_t sa = a >> (N - 1);
fixint_t abs_a = (a ^ sa) - sa;
fixint_t sb = b >> (N - 1);
fixint_t 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;
}
|
