[llvm] [SPIRV] Support for SPV_INTEL_fpga_reg extension (PR #134352)

[Dmitry Sidorov via llvm-commits]

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@@ -238,6 +238,22 @@ static SmallVector<Metadata *> parseAnnotation(Value *I,
                                                 : SmallVector<Metadata *>{};
 }
 
+static bool lowerAnnotation(IntrinsicInst *II) {
+  std::string Anno =
+      getAnnotation(II->getArgOperand(1),
+                    4 < II->arg_size() ? II->getArgOperand(4) : nullptr);
+  if (Anno == "__builtin_intel_fpga_reg") {
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MrSidims wrote:

This is an internal builtin used in https://github.com/intel/llvm , so if you really want to use it in SPIR-V backend, then probably it should be upstreamed to LLVM itself. Depending on your goals it is also worth considering to step away from intel/llvm and llvm-spirv implementation and instead represent fpga_reg as an intrinsic function, leaving the compiler's frontend to emit it.

If you could help with understanding your upstreaming efforts - may be a can give some suggestions.

https://github.com/llvm/llvm-project/pull/134352