Linux cli command llvm-opt-report-16

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NAME 🖥️ llvm-opt-report-16 🖥️

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 running 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 follows:

  • 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

2003-2024, LLVM Project

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