author | Stefan Teleman <stefan.teleman@oracle.com> |
Thu, 28 Jul 2016 16:25:34 -0700 | |
changeset 6512 | 92717ce71105 |
permissions | -rw-r--r-- |
6512
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
1 |
.\" Man page generated from reStructuredText. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
2 |
. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
3 |
.TH "LLVM-DIFF" "1" "2016-07-10" "3.8" "LLVM" |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
4 |
.SH NAME |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
5 |
llvm-diff \- LLVM structural 'diff' |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
6 |
. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
7 |
.nr rst2man-indent-level 0 |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
8 |
. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
9 |
.de1 rstReportMargin |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
10 |
\\$1 \\n[an-margin] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
11 |
level \\n[rst2man-indent-level] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
12 |
level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
13 |
- |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
14 |
\\n[rst2man-indent0] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
15 |
\\n[rst2man-indent1] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
16 |
\\n[rst2man-indent2] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
17 |
.. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
18 |
.de1 INDENT |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
19 |
.\" .rstReportMargin pre: |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
20 |
. RS \\$1 |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
21 |
. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
22 |
. nr rst2man-indent-level +1 |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
23 |
.\" .rstReportMargin post: |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
24 |
.. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
25 |
.de UNINDENT |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
26 |
. RE |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
27 |
.\" indent \\n[an-margin] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
28 |
.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
29 |
.nr rst2man-indent-level -1 |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
30 |
.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
31 |
.in \\n[rst2man-indent\\n[rst2man-indent-level]]u |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
32 |
.. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
33 |
.SH SYNOPSIS |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
34 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
35 |
\fBllvm\-diff\fP [\fIoptions\fP] \fImodule 1\fP \fImodule 2\fP [\fIglobal name ...\fP] |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
36 |
.SH DESCRIPTION |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
37 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
38 |
\fBllvm\-diff\fP compares the structure of two LLVM modules, primarily |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
39 |
focusing on differences in function definitions. Insignificant |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
40 |
differences, such as changes in the ordering of globals or in the |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
41 |
names of local values, are ignored. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
42 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
43 |
An input module will be interpreted as an assembly file if its name |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
44 |
ends in \(aq.ll\(aq; otherwise it will be read in as a bitcode file. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
45 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
46 |
If a list of global names is given, just the values with those names |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
47 |
are compared; otherwise, all global values are compared, and |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
48 |
diagnostics are produced for globals which only appear in one module |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
49 |
or the other. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
50 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
51 |
\fBllvm\-diff\fP compares two functions by comparing their basic blocks, |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
52 |
beginning with the entry blocks. If the terminators seem to match, |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
53 |
then the corresponding successors are compared; otherwise they are |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
54 |
ignored. This algorithm is very sensitive to changes in control flow, |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
55 |
which tend to stop any downstream changes from being detected. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
56 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
57 |
\fBllvm\-diff\fP is intended as a debugging tool for writers of LLVM |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
58 |
passes and frontends. It does not have a stable output format. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
59 |
.SH EXIT STATUS |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
60 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
61 |
If \fBllvm\-diff\fP finds no differences between the modules, it will exit |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
62 |
with 0 and produce no output. Otherwise it will exit with a non\-zero |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
63 |
value. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
64 |
.SH BUGS |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
65 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
66 |
Many important differences, like changes in linkage or function |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
67 |
attributes, are not diagnosed. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
68 |
.sp |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
69 |
Changes in memory behavior (for example, coalescing loads) can cause |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
70 |
massive detected differences in blocks. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
71 |
.SH AUTHOR |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
72 |
Maintained by The LLVM Team (http://llvm.org/). |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
73 |
.SH COPYRIGHT |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
74 |
2003-2016, LLVM Project |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
75 |
.\" Generated by docutils manpage writer. |
92717ce71105
24326140 upgrade LLVM to 3.8.1
Stefan Teleman <stefan.teleman@oracle.com>
parents:
diff
changeset
|
76 |
. |