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[llvm-exegesis] Document `repetition-mode`. 

Reviewers: gchatelet

Subscribers: tschuett, mstojanovic, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74114
This commit is contained in:
Clement Courbet 2020-02-06 12:08:02 +01:00
parent e7cb374433
commit 89a66474b6
1 changed files with 12 additions and 3 deletions
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15
llvm/docs/CommandGuide/llvm-exegesis.rst
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@ -184,10 +184,10 @@ OPTIONS
a comma-separated list. See example 1 for details.
Either `opcode-index`, `opcode-name` or `snippets-file` must be set.
.. option:: -snippets-file=<filename>
.. option:: -snippets-file=<filename>
Specify the custom code snippet to measure. See example 2 for details.
Either `opcode-index`, `opcode-name` or `snippets-file` must be set.
Specify the custom code snippet to measure. See example 2 for details.
Either `opcode-index`, `opcode-name` or `snippets-file` must be set.
.. option:: -mode=[latency|uops|inverse_throughput|analysis]
@ -195,6 +195,15 @@ OPTIONS
to specify at least one of the `-analysis-clusters-output-file=` and
`-analysis-inconsistencies-output-file=`.
.. option:: -repetition-mode=[duplicate|loop]
Specify the repetition mode. `duplicate` will create a large, straight line
basic block with `num-repetitions` copies of the snippet. `loop` will wrap
the snippet in a loop which will be run `num-repetitions` times. The `loop`
mode tends to better hide the effects of the CPU frontend on architectures
that cache decoded instructions, but consumes a register for counting
iterations.
.. option:: -num-repetitions=<Number of repetitions>
Specify the number of repetitions of the asm snippet.