LLVM-OPT-REPORT(1) LLVM LLVM-OPT-REPORT(1)
NAME
llvm-opt-report - generate optimization report from YAML
SYNOPSIS
llvm-opt-report [options] [input]
DESCRIPTION
llvm-opt-report is a tool to generate an optimization report from YAML
optimization record files.
You need to create an input YAML optimization record file before run-
ning llvm-opt-report.
$ clang -c foo.c -o foo.o -O3 -fsave-optimization-record
Then, you create a report using the llvm-opt-report command with the
YAML optimization record file foo.opt.yaml as input.
$ llvm-opt-report foo.opt.yaml -o foo.lst
foo.lst is the generated optimization report.
< foo.c
1 | void bar();
2 | void foo() { bar(); }
3 |
4 | void Test(int *res, int *c, int *d, int *p, int n) {
5 | int i;
6 |
7 | #pragma clang loop vectorize(assume_safety)
8 V4,1 | for (i = 0; i < 1600; i++) {
9 | res[i] = (p[i] == 0) ? res[i] : res[i] + d[i];
10 | }
11 |
12 U16 | for (i = 0; i < 16; i++) {
13 | res[i] = (p[i] == 0) ? res[i] : res[i] + d[i];
14 | }
15 |
16 I | foo();
17 |
18 | foo(); bar(); foo();
I | ^
I | ^
19 | }
20 |
Symbols printed on the left side of the program indicate what kind of
optimization was performed. The meanings of the symbols are as fol-
lows:
• I: The function is inlined.
• U: The loop is unrolled. The following number indicates the unroll
factor.
• V: The loop is vectorized. The following numbers indicate the vector
length and the interleave factor.
OPTIONS
If input is “-” or omitted, llvm-opt-report reads from standard input.
Otherwise, it will read from the specified filename.
If the -o option is omitted, then llvm-opt-report will send its output
to standard output. If the -o option specifies “-”, then the output
will also be sent to standard output.
--help Display available options.
--version
Display the version of this program.
--format=<string>
The format of the optimization record file. The Argument is one
of the following:
• yaml
• yaml-strtab
• bitstream
--no-demangle
Do not demangle function names.
-o=<string>
Output file.
-r=<string>
Root for relative input paths.
-s Do not include vectorization factors, etc.
EXIT STATUS
llvm-opt-report returns 0 on success. Otherwise, an error message is
printed to standard error, and the tool returns 1.
AUTHOR
Maintained by the LLVM Team (https://llvm.org/).
COPYRIGHT
2003-2023, LLVM Project
15 2023-10-16 LLVM-OPT-REPORT(1)
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