[clang] [clang] Add `__bf16` Type Support Macros With Literal Suffix Support (PR #134214)

[via cfe-commits]

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@@ -978,6 +979,28 @@ NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling,
   // we break out of the loop.
   for (; s != ThisTokEnd; ++s) {
     switch (*s) {
+    case 'b':
+    case 'B':
+      if (!isFPConstant)
+        break; // Error for integer constant.
+      if (isBFloat16)
+        break;
+      if (!Target.hasBFloat16Type())
+        break;
+      if (HasSize)
+        break;
+      HasSize = true;
+
+      if ((Target.hasBFloat16Type() || LangOpts.CUDA ||
+           (LangOpts.OpenMPIsTargetDevice && Target.getTriple().isNVPTX())) &&
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overmighty wrote:

We might not need to check for `LangOpts.CUDA || (LangOpts.OpenMPIsTargetDevice && Target.getTriple().isNVPTX())` in our case:

https://github.com/llvm/llvm-project/blob/9eb7e64145f66f59f07edffb4f9c8a648174543e/clang/lib/Basic/Targets/NVPTX.h#L202

I'm not sure why it was needed for `f16` literals.

https://github.com/llvm/llvm-project/pull/134214