[clang] [compiler-rt] [llvm] [SystemZ] Add support for half (fp16) (PR #109164)

[Jonas Paulsson via cfe-commits]

================
@@ -255,4 +255,9 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT) {
     }
     setLibcallName(RTLIB::MULO_I128, nullptr);
   }
+
+  if (TT.isSystemZ()) {
+    setLibcallName(RTLIB::FPROUND_F32_F16, "__truncsfhf2");
+    setLibcallName(RTLIB::FPEXT_F16_F32, "__extendhfsf2");
+  }
----------------
JonPsson1 wrote:

you may be right - as I wrote above I have not really tried this before. Would 
you happen to know how to build and link these?

https://github.com/llvm/llvm-project/pull/109164
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