[NVPTX] Add intrinsics for st.bulk instruction (#128856)

Adds NVVM intrinsics and NVPTX codegen for the `st.bulk` instruction
introduced in ptx8.6 for sm_100. Tests added in
`CodeGen/NVPTX/st_bulk.ll` and verified through ptxas 12.8.0.

PTX Spec Reference:
https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-st-bulk

Author: Wolfram70

llvm/docs/NVPTXUsage.rst

@@ -1446,6 +1446,38 @@ The last argument `i1 %unpack` is a compile-time constant which when set, indica
 For more information, refer to the
 `PTX ISA <https://docs.nvidia.com/cuda/parallel-thread-execution/#tcgen05-instructions-tcgen05-st>`__.
 
+Store Intrinsics
+----------------
+
+'``llvm.nvvm.st.bulk.*``'
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Syntax:
+"""""""
+
+.. code-block:: llvm
+
+  declare void @llvm.nvvm.st.bulk(ptr addrspace(1) %dst, i64 %size, i64 immarg %initval)
+  declare void @llvm.nvvm.st.bulk.shared.cta(ptr addrspace(3) %dst, i64 %size, i64 immarg %initval)
+
+Overview:
+"""""""""
+
+The '``@llvm.nvvm.st.bulk.*``' intrinsics initialize a region of shared memory 
+starting from the location specified by the destination address operand `%dst`.
+
+The integer operand `%size` specifies the amount of memory to be initialized in 
+terms of number of bytes and must be a multiple of 8. Otherwise, the behavior 
+is undefined.
+
+The integer immediate operand `%initval` specifies the initialization value for 
+the memory locations. The only numeric value allowed is 0.
+
+The ``@llvm.nvvm.st.bulk.shared.cta`` and ``@llvm.nvvm.st.bulk`` intrinsics are 
+similar but the latter uses generic addressing (see `Generic Addressing <https://docs.nvidia.com/cuda/parallel-thread-execution/#generic-addressing>`__).
+
+For more information, refer `PTX ISA <https://docs.nvidia.com/cuda/parallel-thread-execution/#data-movement-and-conversion-instructions-st-bulk>`__.
+
 Other Intrinsics
 ----------------
 

llvm/include/llvm/IR/IntrinsicsNVVM.td

@@ -5269,4 +5269,18 @@ foreach shape = ["16x64b", "16x128b", "16x256b", "32x32b", "16x32bx2"] in {
   }
 }
 
+//
+// Bulk store intrinsics
+//
+
+def int_nvvm_st_bulk: DefaultAttrsIntrinsic<[],
+  [llvm_global_ptr_ty, llvm_i64_ty, llvm_i64_ty],
+  [IntrArgMemOnly, IntrWriteMem,
+    WriteOnly<ArgIndex<0>>, NoCapture<ArgIndex<0>>, ImmArg<ArgIndex<2>>]>;
+
+def int_nvvm_st_bulk_shared_cta : DefaultAttrsIntrinsic<[],
+  [llvm_shared_ptr_ty, llvm_i64_ty, llvm_i64_ty],
+  [IntrArgMemOnly, IntrWriteMem,
+    WriteOnly<ArgIndex<0>>, NoCapture<ArgIndex<0>>, ImmArg<ArgIndex<2>>]>;
+
 } // let TargetPrefix = "nvvm"

llvm/lib/Target/NVPTX/NVPTXIntrinsics.td

@@ -7732,3 +7732,17 @@ foreach shape = ["16x64b", "16x128b", "16x256b", "32x32b", "16x32bx2"] in {
 }
 
 } // isConvergent
+
+// Bulk store instructions
+                            
+def INT_NVVM_ST_BULK_GENERIC :
+  NVPTXInst<(outs), (ins ADDR:$dest_addr, Int64Regs:$size),
+            "st.bulk [$dest_addr], $size, 0;",
+            [(int_nvvm_st_bulk addr:$dest_addr, i64:$size, (i64 0))]>,
+            Requires<[hasSM<100>, hasPTX<86>]>;
+
+def INT_NVVM_ST_BULK_SHARED_CTA:
+  NVPTXInst<(outs), (ins ADDR:$dest_addr, Int64Regs:$size),
+            "st.bulk.shared::cta [$dest_addr], $size, 0;",
+            [(int_nvvm_st_bulk_shared_cta addr:$dest_addr, i64:$size, (i64 0))]>,
+            Requires<[hasSM<100>, hasPTX<86>]>;

llvm/test/CodeGen/NVPTX/st_bulk.ll

@@ -0,0 +1,46 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_100 -mattr=+ptx86 | FileCheck --check-prefixes=CHECK,CHECK-PTX64 %s
+; RUN: llc < %s -mtriple=nvptx64 -mcpu=sm_100 -mattr=+ptx86 --nvptx-short-ptr | FileCheck --check-prefixes=CHECK,CHECK-PTX-SHARED32 %s
+; RUN: %if ptxas-12.8 %{ llc < %s -mtriple=nvptx64 -mcpu=sm_100 -mattr=+ptx86 | %ptxas-verify -arch=sm_100 %}
+; RUN: %if ptxas-12.8 %{ llc < %s -mtriple=nvptx64 -mcpu=sm_100 -mattr=+ptx86 --nvptx-short-ptr | %ptxas-verify -arch=sm_100 %}
+
+declare void @llvm.nvvm.st.bulk(ptr addrspace(1), i64, i64)
+define void @st_bulk(ptr addrspace(1) %dest_addr, i64 %size) {
+; CHECK-LABEL: st_bulk(
+; CHECK:       {
+; CHECK-NEXT:    .reg .b64 %rd<3>;
+; CHECK-EMPTY:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ld.param.u64 %rd1, [st_bulk_param_0];
+; CHECK-NEXT:    ld.param.u64 %rd2, [st_bulk_param_1];
+; CHECK-NEXT:    st.bulk [%rd1], %rd2, 0;
+; CHECK-NEXT:    ret;
+  call void @llvm.nvvm.st.bulk(ptr addrspace(1) %dest_addr, i64 %size, i64 0)
+  ret void
+}
+
+declare void @llvm.nvvm.st.bulk.shared.cta(ptr addrspace(3), i64, i64)
+define void @st_bulk_shared_cta(ptr addrspace(3) %dest_addr, i64 %size) {
+; CHECK-PTX64-LABEL: st_bulk_shared_cta(
+; CHECK-PTX64:       {
+; CHECK-PTX64-NEXT:    .reg .b64 %rd<3>;
+; CHECK-PTX64-EMPTY:
+; CHECK-PTX64-NEXT:  // %bb.0:
+; CHECK-PTX64-NEXT:    ld.param.u64 %rd1, [st_bulk_shared_cta_param_0];
+; CHECK-PTX64-NEXT:    ld.param.u64 %rd2, [st_bulk_shared_cta_param_1];
+; CHECK-PTX64-NEXT:    st.bulk.shared::cta [%rd1], %rd2, 0;
+; CHECK-PTX64-NEXT:    ret;
+;
+; CHECK-PTX-SHARED32-LABEL: st_bulk_shared_cta(
+; CHECK-PTX-SHARED32:       {
+; CHECK-PTX-SHARED32-NEXT:    .reg .b32 %r<2>;
+; CHECK-PTX-SHARED32-NEXT:    .reg .b64 %rd<2>;
+; CHECK-PTX-SHARED32-EMPTY:
+; CHECK-PTX-SHARED32-NEXT:  // %bb.0:
+; CHECK-PTX-SHARED32-NEXT:    ld.param.u32 %r1, [st_bulk_shared_cta_param_0];
+; CHECK-PTX-SHARED32-NEXT:    ld.param.u64 %rd1, [st_bulk_shared_cta_param_1];
+; CHECK-PTX-SHARED32-NEXT:    st.bulk.shared::cta [%r1], %rd1, 0;
+; CHECK-PTX-SHARED32-NEXT:    ret;
+   call void @llvm.nvvm.st.bulk.shared.cta(ptr addrspace(3) %dest_addr, i64 %size, i64 0)
+   ret void
+}