[llvm] [NVPTX] Add intrinsics for prefetch.* (PR #125887)

[Durgadoss R via llvm-commits]

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@@ -740,6 +740,31 @@ foreach dim = [1, 2, 3, 4, 5] in {
   }
 }
 
+//Prefetch and Prefetchu 
+class PREFETCH_INTRS<string InstName, Intrinsic Intrin> :
+          NVPTXInst<(outs), (ins Int64Regs:$addr),
+          !strconcat(InstName, " [$addr];"),
+          [(Intrin i64:$addr)]>,
+          Requires<[hasPTX<80>, hasSM<90>]>;
+   
+
+// Only global supports evictlast and evictnormal.
+// Other variants (local and default) only support evictnormal
+foreach addr = ["global", "local", ""] in {
+  foreach level = ["L1", "L2"] in {
+    foreach evict = !if(!eq(addr, "global"),
+                       ["evictlast", "evictnormal"],
+                       ["evictnormal"]) in {
+    
+      defvar inst_name = "prefetch." # !if(!eq(addr, ""), "", addr # ".") # level # "." # evict;
+      defvar intr_name = !strconcat("int_nvvm_", !subst(".", "_", inst_name));
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durga4github wrote:

We can directly use a # here

https://github.com/llvm/llvm-project/pull/125887