[llvm] HP PA-RISC architecture initial build support (PR #121220)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

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

Author: Helge Deller (hdeller)

<details>
<summary>Changes</summary>

Two small patches, which allows to sucessfully build the basic LLVM tools on the HP PA-RISC (hppa) architecture.
Please pull.
Thanks!
Helge

---
Full diff: https://github.com/llvm/llvm-project/pull/121220.diff


2 Files Affected:

- (modified) llvm/cmake/config-ix.cmake (+4) 
- (modified) third-party/benchmark/src/cycleclock.h (+10) 


``````````diff
diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index 64878d28d9e1e5..1dbb468a460447 100644
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -512,6 +512,10 @@ elseif (LLVM_NATIVE_ARCH STREQUAL "m68k")
   set(LLVM_NATIVE_ARCH M68k)
 elseif (LLVM_NATIVE_ARCH MATCHES "loongarch")
   set(LLVM_NATIVE_ARCH LoongArch)
+elseif (LLVM_NATIVE_ARCH MATCHES "hppa1.1")
+  set(LLVM_NATIVE_ARCH HPPA)
+elseif (LLVM_NATIVE_ARCH MATCHES "hppa64")
+  set(LLVM_NATIVE_ARCH HPPA)
 else ()
   message(FATAL_ERROR "Unknown architecture ${LLVM_NATIVE_ARCH}")
 endif ()
diff --git a/third-party/benchmark/src/cycleclock.h b/third-party/benchmark/src/cycleclock.h
index d4f1330b671db9..723a3bd17094de 100644
--- a/third-party/benchmark/src/cycleclock.h
+++ b/third-party/benchmark/src/cycleclock.h
@@ -228,6 +228,16 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
   struct timeval tv;
   gettimeofday(&tv, nullptr);
   return static_cast<int64_t>(tv.tv_sec) * 1000000 + tv.tv_usec;
+#elif defined(__hppa__)
+  // HP PA-RISC provides a user-readable clock counter (cr16), but
+  // it's not syncronized across CPUs and only 32-bit wide when programs
+  // are built as 32-bit binaries.
+  // Use clock_gettime(CLOCK_MONOTONIC, ...) instead of gettimeofday
+  // because is provides nanosecond resolution.
+  // Initialize to always return 0 if clock_gettime fails.
+  struct timespec ts = {0, 0};
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return static_cast<int64_t>(ts.tv_sec) * 1000000000 + ts.tv_nsec;
 #else
   // The soft failover to a generic implementation is automatic only for ARM.
   // For other platforms the developer is expected to make an attempt to create

``````````

</details>


https://github.com/llvm/llvm-project/pull/121220