[clang] [llvm] [clang][HLSL][SPRI-V] Add convergence intrinsics (PR #80680)

[Matt Arsenault via cfe-commits]

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Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/80680 at github.com>


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@@ -4554,6 +4554,13 @@ def HLSLWaveActiveCountBits : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "unsigned int(bool)";
 }
 
+// HLSL
+def HLSLWaveGetLaneIndex : LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_wave_get_lane_index"];
+  let Attributes = [NoThrow, Const];
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arsenm wrote:

We should remove all the explicit convergent markers. We should go forward with https://reviews.llvm.org/D69498. Once you have convergence in the language at all, every function must be assumed convergent by default 

https://github.com/llvm/llvm-project/pull/80680