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121 lines
3.1 KiB
ReStructuredText
121 lines
3.1 KiB
ReStructuredText
llvm-opt-report - generate optimization report from YAML
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========================================================
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.. program:: llvm-opt-report
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SYNOPSIS
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--------
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:program:`llvm-opt-report` [*options*] [input]
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DESCRIPTION
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-----------
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:program:`llvm-opt-report` is a tool to generate an optimization report from YAML optimization record files.
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You need to create an input YAML optimization record file before running :program:`llvm-opt-report`.
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It provides information on the execution time, memory usage, and other details of each optimization pass.
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.. code-block:: console
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$ clang -c foo.c -o foo.o -O3 -fsave-optimization-record
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Then, you create a report using the :program:`llvm-opt-report` command with the YAML optimization record file :file:`foo.opt.yaml` as input.
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.. code-block:: console
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$ llvm-opt-report foo.opt.yaml -o foo.lst
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foo.lst is the generated optimization report.
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.. code-block::
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< foo.c
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1 | void bar();
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2 | void foo() { bar(); }
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3 |
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4 | void Test(int *res, int *c, int *d, int *p, int n) {
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5 | int i;
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6 |
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7 | #pragma clang loop vectorize(assume_safety)
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8 V4,1 | for (i = 0; i < 1600; i++) {
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9 | res[i] = (p[i] == 0) ? res[i] : res[i] + d[i];
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10 | }
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11 |
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12 U16 | for (i = 0; i < 16; i++) {
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13 | res[i] = (p[i] == 0) ? res[i] : res[i] + d[i];
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14 | }
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15 |
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16 I | foo();
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17 |
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18 | foo(); bar(); foo();
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I | ^
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I | ^
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19 | }
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20 |
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Symbols printed on the left side of the program indicate what kind of optimization was performed.
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The meanings of the symbols are as follows:
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- I: The function is inlined.
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- U: The loop is unrolled. The following number indicates the unroll factor.
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- V: The loop is vectorized. The following numbers indicate the vector length and the interleave factor.
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.. note::
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If a specific line of code is output twice, it means that the same optimization pass was applied to that
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line of code twice, and the pass was able to further optimize the code on the second iteration.
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OPTIONS
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-------
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If ``input`` is "``-``" or omitted, :program:`llvm-opt-report` reads from standard
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input. Otherwise, it will read from the specified filename.
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If the :option:`-o` option is omitted, then :program:`llvm-opt-report` will send its output
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to standard output. If the :option:`-o` option specifies "``-``", then the output will also
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be sent to standard output.
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.. option:: --help
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Display available options.
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.. option:: --version
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Display the version of this program.
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.. option:: --format=<string>
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The format of the optimization record file.
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The Argument is one of the following:
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- yaml
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- bitstream
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.. option:: --no-demangle
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Do not demangle function names.
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.. option:: -o=<string>
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Output file.
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.. option:: -r=<string>
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Root for relative input paths.
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.. option:: -s
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Do not include vectorization factors, etc.
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EXIT STATUS
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-----------
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:program:`llvm-opt-report` returns 0 on success. Otherwise, an error message is printed
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to standard error, and the tool returns 1.
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