[clang] [llvm] [SPIR-V] Implement SPV_KHR_untyped_pointers extension (PR #201233)

[Dmitry Sidorov via cfe-commits]

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@@ -843,10 +844,40 @@ Register SPIRVGlobalRegistry::buildGlobalVariable(
   if (&GVBuilder.getMBB() != &EntryBB)
     GVBuilder.setInsertPt(EntryBB, EntryBB.getFirstTerminator());
 
-  auto MIB = GVBuilder.buildInstr(SPIRV::OpVariable)
+  // Pointers to opaque types stay typed even with the extension on, so emit the
+  // untyped variant only when the result is actually an untyped pointer.
+  const SPIRVSubtarget &Subtarget =
+      cast<SPIRVSubtarget>(MIRBuilder.getMF().getSubtarget());
+  const bool UseUntypedPointers =
+      BaseType->getOpcode() == SPIRV::OpTypeUntypedPointerKHR;
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MrSidims wrote:

renamed, thanks!

https://github.com/llvm/llvm-project/pull/201233