llvm/test/CodeGen/AMDGPU/scratch-buffer.ll

; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=SI < %s | FileCheck --check-prefix=GCN --check-prefix=DEFAULT-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mcpu=tonga < %s | FileCheck --check-prefix=GCN --check-prefix=DEFAULT-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mattr=+huge-scratch-buffer -mcpu=SI < %s | FileCheck --check-prefix=GCN --check-prefix=HUGE-SCRATCH %s
; RUN: llc -verify-machineinstrs -march=amdgcn -mattr=+huge-scratch-buffer -mcpu=tonga < %s | FileCheck --check-prefix=GCN --check-prefix=HUGE-SCRATCH %s

; When a frame index offset is more than 12-bits, make sure we don't store
; it in mubuf's offset field.

; Also, make sure we use the same register for storing the scratch buffer addresss
; for both stores. This register is allocated by the register scavenger, so we
; should be able to reuse the same regiser for each scratch buffer access.

; GCN-LABEL: {{^}}legal_offset_fi:
; GCN: v_mov_b32_e32 [[OFFSET:v[0-9]+]], 0{{$}}
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; GCN: v_mov_b32_e32 [[OFFSET]], 0x8000
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}

define void @legal_offset_fi(i32 addrspace(1)* %out, i32 %cond, i32 %if_offset, i32 %else_offset) {
entry:
  %scratch0 = alloca [8192 x i32]
  %scratch1 = alloca [8192 x i32]

  %scratchptr0 = getelementptr [8192 x i32], [8192 x i32]* %scratch0, i32 0, i32 0
  store i32 1, i32* %scratchptr0

  %scratchptr1 = getelementptr [8192 x i32], [8192 x i32]* %scratch1, i32 0, i32 0
  store i32 2, i32* %scratchptr1

  %cmp = icmp eq i32 %cond, 0
  br i1 %cmp, label %if, label %else

if:
  %if_ptr = getelementptr [8192 x i32], [8192 x i32]* %scratch0, i32 0, i32 %if_offset
  %if_value = load i32, i32* %if_ptr
  br label %done

else:
  %else_ptr = getelementptr [8192 x i32], [8192 x i32]* %scratch1, i32 0, i32 %else_offset
  %else_value = load i32, i32* %else_ptr
  br label %done

done:
  %value = phi i32 [%if_value, %if], [%else_value, %else]
  store i32 %value, i32 addrspace(1)* %out
  ret void

  ret void

}

; GCN-LABEL: {{^}}legal_offset_fi_offset
; GCN: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen
; GCN: v_add_i32_e32 [[OFFSET:v[0-9]+]], 0x8000
; GCN: buffer_store_dword v{{[0-9]+}}, [[OFFSET]], s[{{[0-9]+}}:{{[0-9]+}}], s{{[0-9]+}} offen{{$}}

define void @legal_offset_fi_offset(i32 addrspace(1)* %out, i32 %cond, i32 addrspace(1)* %offsets, i32 %if_offset, i32 %else_offset) {
entry:
  %scratch0 = alloca [8192 x i32]
  %scratch1 = alloca [8192 x i32]

  %offset0 = load i32, i32 addrspace(1)* %offsets
  %scratchptr0 = getelementptr [8192 x i32], [8192 x i32]* %scratch0, i32 0, i32 %offset0
  store i32 %offset0, i32* %scratchptr0

  %offsetptr1 = getelementptr i32, i32 addrspace(1)* %offsets, i32 1
  %offset1 = load i32, i32 addrspace(1)* %offsetptr1
  %scratchptr1 = getelementptr [8192 x i32], [8192 x i32]* %scratch1, i32 0, i32 %offset1
  store i32 %offset1, i32* %scratchptr1

  %cmp = icmp eq i32 %cond, 0
  br i1 %cmp, label %if, label %else

if:
  %if_ptr = getelementptr [8192 x i32], [8192 x i32]* %scratch0, i32 0, i32 %if_offset
  %if_value = load i32, i32* %if_ptr
  br label %done

else:
  %else_ptr = getelementptr [8192 x i32], [8192 x i32]* %scratch1, i32 0, i32 %else_offset
  %else_value = load i32, i32* %else_ptr
  br label %done

done:
  %value = phi i32 [%if_value, %if], [%else_value, %else]
  store i32 %value, i32 addrspace(1)* %out
  ret void
}

; GCN-LABEL: @neg_vaddr_offset
; We can't prove %offset is positive, so we must do the computation with the
; immediate in an add instruction instead of folding offset and the immediate into
; the store instruction.
; GCN: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @neg_vaddr_offset(i32 %offset) {
entry:
  %array = alloca [8192 x i32]
  %ptr_offset = add i32 %offset, 4
  %ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 %ptr_offset
  store i32 0, i32* %ptr
  ret void
}

; GCN-LABEL: @pos_vaddr_offse
; DEFAULT-SCRATCH: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen offset:16
; HUGE-SCRATCH: buffer_store_dword v{{[0-9]+}}, v{{[0-9]+}}, s[{{[0-9]+:[0-9]+}}], s{{[0-9]+}} offen{{$}}
define void @pos_vaddr_offset(i32 addrspace(1)* %out, i32 %offset) {
entry:
  %array = alloca [8192 x i32]
  %ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 4
  store i32 0, i32* %ptr
  %load_ptr = getelementptr [8192 x i32], [8192 x i32]* %array, i32 0, i32 %offset
  %val = load i32, i32* %load_ptr
  store i32 %val, i32 addrspace(1)* %out
  ret void
}