[clang-tools-extra] [llvm] [libcxxabi] [libclc] [libcxx] [flang] [clang] [libunwind] [compiler-rt] [libc] [lld] [lldb] [builtins] Generate __multc3 for z/OS (PR #77554)

[Alexander Richardson via cfe-commits]

================
@@ -374,10 +376,10 @@ static __inline fp_t __compiler_rt_fmax(fp_t x, fp_t y) {
 #endif
 }
 
-#elif defined(QUAD_PRECISION) && defined(CRT_HAS_TF_MODE)
+#elif defined(QUAD_PRECISION)
 // The generic implementation only works for ieee754 floating point. For other
 // floating point types, continue to rely on the libm implementation for now.
-#if defined(CRT_HAS_IEEE_TF)
+#if defined(CRT_HAS_TF_MODE) && defined(CRT_HAS_IEEE_TF)
----------------
arichardson wrote:

```suggestion
#if defined(CRT_HAS_IEEE_TF) && defined(CRT_HAS_128BIT)
```

https://github.com/llvm/llvm-project/pull/77554