llvm/test/CodeGen/AMDGPU/replace-lds-by-ptr-use-same-lds.ll

; RUN: opt -S -mtriple=amdgcn--  -amdgpu-replace-lds-use-with-pointer -amdgpu-enable-lds-replace-with-pointer=true < %s | FileCheck %s

; DESCRIPTION:
;
; There is one lds global defined here, and this lds is used within a single non-kernel
; function multiple times, and this non-kernel function is reachable from kernel. Hence
; pointer takes place. But important note is - store-to/load-from pointer should happen
; only once irrespective of number of uses.
;

; Original LDS should exist.
; CHECK: @lds1 = internal addrspace(3) global [1 x i32] undef, align 4
@lds1 = internal addrspace(3) global [1 x i32] undef, align 4

; Pointers should be created.
; CHECK: @lds1.ptr = internal unnamed_addr addrspace(3) global i16 undef, align 2

; Pointer replacement code should be added.
define internal void @function() {
; CHECK-LABEL: entry:
; CHECK:   %0 = load i16, i16 addrspace(3)* @lds1.ptr, align 2
; CHECK:   %1 = getelementptr i8, i8 addrspace(3)* null, i16 %0
; CHECK:   %2 = bitcast i8 addrspace(3)* %1 to [1 x i32] addrspace(3)*
; CHECK:   %gep1 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
; CHECK:   %gep2 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
; CHECK:   %gep3 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
; CHECK:   ret void
entry:
  %gep1 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
  %gep2 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
  %gep3 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
  ret void
}

; Pointer initialization code shoud be added;
define protected amdgpu_kernel void @kernel() {
; CHECK-LABEL: entry:
; CHECK:   %0 = call i32 @llvm.amdgcn.mbcnt.lo(i32 -1, i32 0)
; CHECK:   %1 = icmp eq i32 %0, 0
; CHECK:   br i1 %1, label %2, label %3
;
; CHECK-LABEL: 2:
; CHECK:   store i16 ptrtoint ([1 x i32] addrspace(3)* @lds1 to i16), i16 addrspace(3)* @lds1.ptr, align 2
; CHECK:   br label %3
;
; CHECK-LABEL: 3:
; CHECK:   call void @llvm.amdgcn.wave.barrier()
; CHECK:   call void @function()
; CHECK:   ret void
entry:
  call void @function()
  ret void
}