xref: /aosp_15_r20/external/llvm/test/CodeGen/AMDGPU/mad24-get-global-id.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: llc -mtriple=amdgcn--amdhsa -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s

; If the workgroup id range is restricted, we should be able to use
; mad24 for the usual indexing pattern.

declare i32 @llvm.amdgcn.workgroup.id.x() #0
declare i32 @llvm.amdgcn.workitem.id.x() #0
declare i8 addrspace(2)* @llvm.amdgcn.dispatch.ptr() #0

; GCN-LABEL: {{^}}get_global_id_0:
; GCN: s_and_b32 [[WGSIZEX:s[0-9]+]], {{s[0-9]+}}, 0xffff
; GCN: v_mov_b32_e32 [[VWGSIZEX:v[0-9]+]], [[WGSIZEX]]
; GCN: v_mad_u32_u24 v{{[0-9]+}}, [[VWGSIZEX]], s8, v0
define void @get_global_id_0(i32 addrspace(1)* %out) #1 {
  %dispatch.ptr = call i8 addrspace(2)* @llvm.amdgcn.dispatch.ptr()
  %cast.dispatch.ptr = bitcast i8 addrspace(2)* %dispatch.ptr to i32 addrspace(2)*
  %gep = getelementptr inbounds i32, i32 addrspace(2)* %cast.dispatch.ptr, i64 1
  %workgroup.size.xy = load i32, i32 addrspace(2)* %gep, align 4, !invariant.load !0
  %workgroup.size.x = and i32 %workgroup.size.xy, 65535

  %workitem.id.x = call i32 @llvm.amdgcn.workitem.id.x(), !range !1
  %workgroup.id.x = call i32 @llvm.amdgcn.workgroup.id.x(), !range !2

  %mul = mul i32 %workgroup.id.x, %workgroup.size.x
  %add = add i32 %mul, %workitem.id.x

  store i32 %add, i32 addrspace(1)* %out, align 4
  ret void
}

attributes #0 = { nounwind readnone }
attributes #1 = { nounwind }

!0 = !{}
!1 = !{i32 0, i32 1024}
!2 = !{i32 0, i32 16777216}