[llvm] [Docs][llvm-exegesis] Add documentation on recently added options (PR #75408)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/75408

This patch adds information on the new LLVM-EXEGESIS-SNIPPET-ADDRESS annotation and on the --benchmark-repeat-count flag.

>From e60c34d15942d3d14a8d7f6d01e6bc51b2caca2e Mon Sep 17 00:00:00 2001
From: Aiden Grossman <agrossman154 at yahoo.com>
Date: Wed, 13 Dec 2023 16:06:14 -0800
Subject: [PATCH] [Docs][llvm-exegesis] Add documentation on recently added
 options

This patch adds information on the new LLVM-EXEGESIS-SNIPPET-ADDRESS
annotation and on the --benchmark-repeat-count flag.
---
 llvm/docs/CommandGuide/llvm-exegesis.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/llvm/docs/CommandGuide/llvm-exegesis.rst b/llvm/docs/CommandGuide/llvm-exegesis.rst
index 874bae82a1029a..a1c631e9687ba7 100644
--- a/llvm/docs/CommandGuide/llvm-exegesis.rst
+++ b/llvm/docs/CommandGuide/llvm-exegesis.rst
@@ -81,6 +81,12 @@ properly.
   definition should start at. Note that a single memory definition can be
   mapped multiple times. Using this annotation requires the subprocess
   execution mode.
+* `LLVM-EXEGESIS-SNIPPET-ADDRESS <address>` - This annotation allows for
+  setting the address where the beginning of the snippet to be executed will
+  be mapped in at. The address is given in hexadecimal. Note that the snippet
+  also includes setup code, so the instruction exactly at the specified
+  address will not be the first instruction in the snippet. Using this
+  annotation requires the subprocess execution mode.
 
 EXAMPLE 1: benchmarking instructions
 ------------------------------------
@@ -425,6 +431,12 @@ OPTIONS
   features such as memory annotations but is currently restricted to X86-64
   on Linux.
 
+.. option:: --benchmark-repeat-count=<repeat-count>
+
+  This option enables specifying the number of times to repeat the benchmark
+  when performing latency benchmarks. By default, llvm-exegesis will repeat
+  a latency measurement 30 times and then aggregate the results.
+
 EXIT STATUS
 -----------