[llvm] Add RISC-V support information to readme (PR #132699)

[via llvm-commits]

https://github.com/AnastasiyaChernikova updated https://github.com/llvm/llvm-project/pull/132699

>From fd5e3d4519f54cbd8565b2f73ed53af6996fbdbc Mon Sep 17 00:00:00 2001
From: Anastasiya Chernikova <anastasiya.chernikova at syntacore.com>
Date: Mon, 24 Mar 2025 12:34:27 +0300
Subject: [PATCH] Add RISC-V support information to readme

---
 llvm/docs/CommandGuide/llvm-exegesis.rst | 9 +++++----
 llvm/tools/llvm-exegesis/README.md       | 3 +++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/llvm/docs/CommandGuide/llvm-exegesis.rst b/llvm/docs/CommandGuide/llvm-exegesis.rst
index 8266d891a5e6b..821d5f7e8305f 100644
--- a/llvm/docs/CommandGuide/llvm-exegesis.rst
+++ b/llvm/docs/CommandGuide/llvm-exegesis.rst
@@ -34,10 +34,11 @@ SUPPORTED PLATFORMS
 -------------------
 
 :program:`llvm-exegesis` currently only supports X86 (64-bit only), ARM
-(AArch64 only, snippet generation is sparse), MIPS, and PowerPC (PowerPC64LE
-only) on Linux for benchmarking. Not all benchmarking functionality is
-guaranteed to work on every platform. :program:`llvm-exegesis` also has a
-separate analysis mode that is supported on every platform that LLVM is.
+(AArch64 only, snippet generation is sparse), MIPS, PowerPC (PowerPC64LE
+only) and RISC-V (RV64I/E and RV32I/E) on Linux for benchmarking. Not all
+benchmarking functionality is guaranteed to work on every platform.
+:program:`llvm-exegesis` also has a separate analysis mode that is supported on
+every platform that LLVM is.
 
 To enable benchmarking in llvm-exegesis, LLVM must be configured and built with
 `LLVM_ENABLE_LIBPFM` enabled, as :program:`llvm-exegesis` depends on libpfm4
diff --git a/llvm/tools/llvm-exegesis/README.md b/llvm/tools/llvm-exegesis/README.md
index deb0f230f032f..aabc4de1f3ab4 100644
--- a/llvm/tools/llvm-exegesis/README.md
+++ b/llvm/tools/llvm-exegesis/README.md
@@ -32,6 +32,9 @@ architectures:
     e.g. pseudo instructions and most register classes are not supported.
 * MIPS
 * PowerPC (PowerPC64LE only)
+* RISC-V
+  * RV64I/E, RV32I/E and extensions supported by LLVM's RISC-V backend with
+    some limitations.
 
 Note that not all benchmarking functionality is guaranteed to work on all platforms.