[NVPTX] Add Intrinsics for applypriority.* (#127989)

\[NVPTX\] Add ApplyPriority intrinsics

This PR adds applypriority.\* intrinsics with relevant eviction
priorities.

* The lowering is handled from nvvm to nvptx tablegen directly.
* Lit tests are added as part of applypriority.ll
* The generated PTX is verified with a 12.3 ptxas executable.
* Added docs for these intrinsics in NVPTXUsage.rst.

For more information, refer to the PTX ISA

`<https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-applypriority>`_.

---------

Co-authored-by: abmajumder <[email protected]>

Author: abhilash1910

llvm/docs/NVPTXUsage.rst

@@ -647,6 +647,30 @@ uses and eviction priority which can be accessed by the '``.level::eviction_prio
 For more information, refer to the PTX ISA
 `<https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-prefetch-prefetchu>`_.
 
+'``llvm.nvvm.applypriority.*``'
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+.. code-block:: llvm
+
+  declare void  @llvm.nvvm.applypriority.global.L2.evict.normal(ptr addrspace(1) %global_ptr, i64 %size)
+  declare void  @llvm.nvvm.applypriority.L2.evict.normal(ptr %ptr, i64 %size)
+
+Overview:
+"""""""""
+
+The '``@llvm.nvvm.applypriority.*``'  applies the cache eviction priority specified by the
+.level::eviction_priority qualifier to the address range [a..a+size) in the specified cache 
+level. If no state space is specified then Generic Addressing is used. If the specified address 
+does not fall within the address window of .global state space then the behavior is undefined.
+The operand size is an integer constant that specifies the amount of data, in bytes, in the specified cache
+level on which the priority is to be applied. The only supported value for the size operand is 128.
+
+For more information, refer to the PTX ISA
+`<https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-applypriority>`_.
+
 '``llvm.nvvm.cp.async.bulk.tensor.g2s.tile.[1-5]d``'
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

llvm/include/llvm/IR/IntrinsicsNVVM.td

@@ -5072,6 +5072,16 @@ def int_nvvm_prefetch_global_L2_evict_last: Intrinsic<[], [llvm_global_ptr_ty],
 def int_nvvm_prefetchu_L1 : Intrinsic<[], [llvm_ptr_ty],
   [IntrArgMemOnly, ReadOnly<ArgIndex<0>>, NoCapture<ArgIndex<0>>]>;
 
+def int_nvvm_applypriority_global_L2_evict_normal
+  : DefaultAttrsIntrinsic<[], [llvm_global_ptr_ty, llvm_i64_ty],
+    [IntrArgMemOnly, ReadOnly<ArgIndex<0>>, NoCapture<ArgIndex<0>>,
+    ImmArg<ArgIndex<1>>]>;
+
+def int_nvvm_applypriority_L2_evict_normal
+  : DefaultAttrsIntrinsic<[], [llvm_ptr_ty, llvm_i64_ty],
+    [IntrArgMemOnly, ReadOnly<ArgIndex<0>>, NoCapture<ArgIndex<0>>,
+    ImmArg<ArgIndex<1>>]>;
+
 
 // Intrinsics for Bulk Copy using TMA (non-tensor)
 // From Global to Shared Cluster

llvm/lib/Target/NVPTX/NVPTXIntrinsics.td

@@ -789,6 +789,17 @@ def PREFETCH_GLOBAL_L2_EVICT_LAST   : NVPTXInst<(outs), (ins Int64Regs:$addr),
 
 def PREFETCHU_L1 : PREFETCH_INTRS<"prefetchu.L1">;
 
+//Applypriority intrinsics
+class APPLYPRIORITY_L2_INTRS<string addr> :
+          NVPTXInst<(outs), (ins Int64Regs:$addr, Int64Regs:$size),
+          StrJoin<".", ["applypriority", addr , "L2::evict_normal"]>.ret # " [$addr], $size;",
+          [(!cast<Intrinsic>(StrJoin<"_", ["int_nvvm_applypriority", addr , "L2_evict_normal"]>.ret)
+          i64:$addr, i64:$size)]>,
+          Requires<[hasPTX<74>, hasSM<80>]>;
+
+def APPLYPRIORITY_L2_EVICT_NORMAL        : APPLYPRIORITY_L2_INTRS<"">;
+def APPLYPRIORITY_GLOBAL_L2_EVICT_NORMAL : APPLYPRIORITY_L2_INTRS<"global">;
+
 //-----------------------------------
 // MBarrier Functions
 //-----------------------------------

llvm/test/CodeGen/NVPTX/applypriority.ll

@@ -0,0 +1,34 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_80 -mattr=+ptx74| FileCheck --check-prefixes=CHECK-PTX64 %s
+; RUN: %if ptxas-11.4 %{ llc < %s -mtriple=nvptx64 -mcpu=sm_80 -mattr=+ptx74| %ptxas-verify -arch=sm_80 %}
+
+target triple = "nvptx64-nvidia-cuda"
+
+declare void  @llvm.nvvm.applypriority.global.L2.evict.normal(ptr addrspace(1) %global_ptr, i64 %size)
+declare void  @llvm.nvvm.applypriority.L2.evict.normal(ptr %ptr, i64 %size)
+
+define void @applypriority_global_L2(ptr addrspace(1) %global_ptr, i64 %size) {
+; CHECK-PTX64-LABEL: applypriority_global_L2(
+; CHECK-PTX64:       {
+; CHECK-PTX64-NEXT:    .reg .b64 %rd<2>;
+; CHECK-PTX64-EMPTY:
+; CHECK-PTX64-NEXT:  // %bb.0:
+; CHECK-PTX64-NEXT:    ld.param.u64 %rd1, [applypriority_global_L2_param_0];
+; CHECK-PTX64-NEXT:    applypriority.global.L2::evict_normal [%rd1], 128;
+; CHECK-PTX64-NEXT:    ret;
+  tail call void @llvm.nvvm.applypriority.global.L2.evict.normal(ptr addrspace(1) %global_ptr, i64 128)
+  ret void
+}
+
+define void @applypriority_L2(ptr %ptr, i64 %size) {
+; CHECK-PTX64-LABEL: applypriority_L2(
+; CHECK-PTX64:       {
+; CHECK-PTX64-NEXT:    .reg .b64 %rd<2>;
+; CHECK-PTX64-EMPTY:
+; CHECK-PTX64-NEXT:  // %bb.0:
+; CHECK-PTX64-NEXT:    ld.param.u64 %rd1, [applypriority_L2_param_0];
+; CHECK-PTX64-NEXT:    applypriority.L2::evict_normal [%rd1], 128;
+; CHECK-PTX64-NEXT:    ret;
+  tail call void @llvm.nvvm.applypriority.L2.evict.normal(ptr %ptr, i64 128)
+  ret void
+}