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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
lli - directly execute programs from LLVM bitcode
=================================================
.. program:: lli
SYNOPSIS
--------
:program:`lli` [*options*] [*filename*] [*program args*]
DESCRIPTION
-----------
:program:`lli` directly executes programs in LLVM bitcode format. It takes a program
in LLVM bitcode format and executes it using a just-in-time compiler or an
interpreter.
:program:`lli` is *not* an emulator. It will not execute IR of different architectures
and it can only interpret (or JIT-compile) for the host architecture.
The JIT compiler takes the same arguments as other tools, like :program:`llc`,
but they don't necessarily work for the interpreter.
If `filename` is not specified, then :program:`lli` reads the LLVM bitcode for the
program from standard input.
The optional *args* specified on the command line are passed to the program as
arguments.
GENERAL OPTIONS
---------------
.. option:: -fake-argv0=executable
Override the ``argv[0]`` value passed into the executing program.
.. option:: -force-interpreter={false,true}
If set to true, use the interpreter even if a just-in-time compiler is available
for this architecture. Defaults to false.
.. option:: -help
Print a summary of command line options.
.. option:: -load=pluginfilename
Causes :program:`lli` to load the plugin (shared object) named *pluginfilename* and use
it for optimization.
.. option:: -stats
Print statistics from the code-generation passes. This is only meaningful for
the just-in-time compiler, at present.
.. option:: -time-passes
Record the amount of time needed for each code-generation pass and print it to
standard error.
.. option:: -version
Print out the version of :program:`lli` and exit without doing anything else.
TARGET OPTIONS
--------------
.. option:: -mtriple=target triple
Override the target triple specified in the input bitcode file with the
specified string. This may result in a crash if you pick an
architecture which is not compatible with the current system.
.. option:: -march=arch
Specify the architecture for which to generate assembly, overriding the target
encoded in the bitcode file. See the output of **llc -help** for a list of
valid architectures. By default this is inferred from the target triple or
autodetected to the current architecture.
.. option:: -mcpu=cpuname
Specify a specific chip in the current architecture to generate code for.
By default this is inferred from the target triple and autodetected to
the current architecture. For a list of available CPUs, use:
**llvm-as < /dev/null | llc -march=xyz -mcpu=help**
.. option:: -mattr=a1,+a2,-a3,...
Override or control specific attributes of the target, such as whether SIMD
operations are enabled or not. The default set of attributes is set by the
current CPU. For a list of available attributes, use:
**llvm-as < /dev/null | llc -march=xyz -mattr=help**
FLOATING POINT OPTIONS
----------------------
.. option:: -disable-excess-fp-precision
Disable optimizations that may increase floating point precision.
.. option:: -enable-no-infs-fp-math
Enable optimizations that assume no Inf values.
.. option:: -enable-no-nans-fp-math
Enable optimizations that assume no NAN values.
.. option:: -enable-unsafe-fp-math
Causes :program:`lli` to enable optimizations that may decrease floating point
precision.
.. option:: -soft-float
Causes :program:`lli` to generate software floating point library calls instead of
equivalent hardware instructions.
CODE GENERATION OPTIONS
-----------------------
.. option:: -code-model=model
Choose the code model from:
.. code-block:: text
default: Target default code model
tiny: Tiny code model
small: Small code model
kernel: Kernel code model
medium: Medium code model
large: Large code model
.. option:: -disable-post-RA-scheduler
Disable scheduling after register allocation.
.. option:: -disable-spill-fusing
Disable fusing of spill code into instructions.
.. option:: -jit-enable-eh
Exception handling should be enabled in the just-in-time compiler.
.. option:: -join-liveintervals
Coalesce copies (default=true).
.. option:: -nozero-initialized-in-bss
Don't place zero-initialized symbols into the BSS section.
.. option:: -pre-RA-sched=scheduler
Instruction schedulers available (before register allocation):
.. code-block:: text
=default: Best scheduler for the target
=none: No scheduling: breadth first sequencing
=simple: Simple two pass scheduling: minimize critical path and maximize processor utilization
=simple-noitin: Simple two pass scheduling: Same as simple except using generic latency
=list-burr: Bottom-up register reduction list scheduling
=list-tdrr: Top-down register reduction list scheduling
=list-td: Top-down list scheduler
.. option:: -regalloc=allocator
Register allocator to use (default=linearscan)
.. code-block:: text
=bigblock: Big-block register allocator
=linearscan: linear scan register allocator
=local: local register allocator
=simple: simple register allocator
.. option:: -relocation-model=model
Choose relocation model from:
.. code-block:: text
=default: Target default relocation model
=static: Non-relocatable code
=pic: Fully relocatable, position independent code
=dynamic-no-pic: Relocatable external references, non-relocatable code
.. option:: -spiller
Spiller to use (default=local)
.. code-block:: text
=simple: simple spiller
=local: local spiller
.. option:: -x86-asm-syntax=syntax
Choose style of code to emit from X86 backend:
.. code-block:: text
=att: Emit AT&T-style assembly
=intel: Emit Intel-style assembly
EXIT STATUS
-----------
If :program:`lli` fails to load the program, it will exit with an exit code of 1.
Otherwise, it will return the exit code of the program it executes.
SEE ALSO
--------
:manpage:`llc(1)`
|
