[Openmp-commits] [openmp] Add openmp support to System z (PR #66081)

[Ilya Leoshkevich via Openmp-commits]

iii-i wrote:

I'm slowly going through the failures in the openmp testsuite (the llvm testsuite is now green). So far I have a couple of fixups:

```
diff --git a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
index 7a3a2a7e9013..6abb203f0c36 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZTargetMachine.cpp
@@ -226,6 +226,8 @@ void SystemZPassConfig::addIRPasses() {
     addPass(createLoopDataPrefetchPass());
   }
 
+  addPass(createAtomicExpandPass());
+
   TargetPassConfig::addIRPasses();
 }
 
diff --git a/openmp/runtime/src/kmp.h b/openmp/runtime/src/kmp.h
index 339e4ca4be6b..4397565e8f47 100644
--- a/openmp/runtime/src/kmp.h
+++ b/openmp/runtime/src/kmp.h
@@ -2456,12 +2456,21 @@ typedef struct kmp_depend_info {
   union {
     kmp_uint8 flag; // flag as an unsigned char
     struct { // flag as a set of 8 bits
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+      unsigned all : 1;
+      unsigned unused : 3;
+      unsigned set : 1;
+      unsigned mtx : 1;
+      unsigned out : 1;
+      unsigned in : 1;
+#else
       unsigned in : 1;
       unsigned out : 1;
       unsigned mtx : 1;
       unsigned set : 1;
       unsigned unused : 3;
       unsigned all : 1;
+#endif
     } flags;
   };
 } kmp_depend_info_t;
```

and there are more to come (e.g., we need to support backchain unwinding via `__builtin_frame_address()` in order to make some of the tests happy). I'll post the updates here.

https://github.com/llvm/llvm-project/pull/66081