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

[Nikita Popov via cfe-commits]

================
@@ -548,11 +543,28 @@ SystemZTargetLowering::SystemZTargetLowering(const 
TargetMachine &TM,
   }
 
   // Handle floating-point types.
+  if (!useSoftFloat()) {
+    // Promote all f16 operations to float, with some exceptions below.
+    for (unsigned Opc = 0; Opc < ISD::BUILTIN_OP_END; ++Opc)
+      setOperationAction(Opc, MVT::f16, Promote);
----------------
nikic wrote:

I thought Promote for half types is broken and you need to use SoftPromoteHalf 
for correct rounding?

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