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
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// *****************************************************************
//
// The Compcert verified compiler
//
// Xavier Leroy, INRIA Paris
//
// Copyright (c) 2016 Institut National de Recherche en Informatique et
// en Automatique.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// *********************************************************************
// Helper functions for 64-bit integer arithmetic. IA32 version.
#include "sysdeps.h"
// Multiply-high unsigned
#define XL 12(%esp)
#define XH 16(%esp)
#define YL 20(%esp)
#define YH 24(%esp)
// X * Y = 2^64 XH.YH + 2^32 (XH.YL + XL.YH) + XL.YL
FUNCTION(__compcert_i64_umulh)
pushl %esi
pushl %edi
movl XL, %eax
mull YL // EDX:EAX = 64-bit product XL.YL
movl %edx, %ecx
xorl %esi, %esi
xorl %edi, %edi // EDI:ESI:ECX accumulate bits 127:32 of result
movl XH, %eax
mull YL // EDX:EAX = 64-bit product XH.YL
addl %eax, %ecx
adcl %edx, %esi
adcl $0, %edi
movl YH, %eax
mull XL // EDX:EAX = 64-bit product YH.XL
addl %eax, %ecx
adcl %edx, %esi
adcl $0, %edi
movl XH, %eax
mull YH // EDX:EAX = 64-bit product XH.YH
addl %esi, %eax
adcl %edi, %edx
popl %edi
popl %esi
ret
ENDFUNCTION(__compcert_i64_umulh)
|
