[llvm] [benchmark] Support Linux/sparc64 /proc/cpuinfo (PR #125503)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-third-party-benchmark

Author: Rainer Orth (rorth)

<details>
<summary>Changes</summary>

When running an LLVM 20.1.0 rc1 reltest on Linux/sparc64, all 75 of the new `libcxx/test/benchmarks` tests `FAIL`, all in the same way:

```
# .---command stderr------------
# | Unable to extract number of CPUs.  If your platform uses /proc/cpuinfo, custom support may need to be added.
```

And indeed the Linux/sparc64 `/proc/cpuinfo` format is completely different from the x86_64 one: the interesting line is
```
ncpus active	: 24
```
This patch adjusts `sysinfo.cc` to handle that.

Tested on `sparc64-unknown-linux-gnu`.

I hope this can go in without going via upstream which doesn't have the analogous alpha patch either.

---
Full diff: https://github.com/llvm/llvm-project/pull/125503.diff


1 Files Affected:

- (modified) third-party/benchmark/src/sysinfo.cc (+2) 


``````````diff
diff --git a/third-party/benchmark/src/sysinfo.cc b/third-party/benchmark/src/sysinfo.cc
index 2bed1663af2e955..22944a41376f60a 100644
--- a/third-party/benchmark/src/sysinfo.cc
+++ b/third-party/benchmark/src/sysinfo.cc
@@ -520,6 +520,8 @@ int GetNumCPUsImpl() {
   }
 #if defined(__alpha__)
   const std::string Key = "cpus detected";
+#elif defined(__sparc__)
+  const std::string Key = "ncpus active";
 #else
   const std::string Key = "processor";
 #endif

``````````

</details>


https://github.com/llvm/llvm-project/pull/125503