path: root/llvm/test/CodeGen/AMDGPU/wqm.ll

;RUN: llc < %s -march=amdgcn -mcpu=verde -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=SI
;RUN: llc < %s -march=amdgcn -mcpu=tonga -verify-machineinstrs | FileCheck %s --check-prefix=CHECK --check-prefix=VI

; Check that WQM isn't triggered by image load/store intrinsics.
;
;CHECK-LABEL: {{^}}test1:
;CHECK-NOT: s_wqm
define amdgpu_ps <4 x float> @test1(<8 x i32> inreg %rsrc, <4 x i32> %c) {
main_body:
  %tex = call <4 x float> @llvm.amdgcn.image.load.v4i32(<4 x i32> %c, <8 x i32> %rsrc, i32 15, i1 0, i1 0, i1 0, i1 0)
  call void @llvm.amdgcn.image.store.v4i32(<4 x float> %tex, <4 x i32> %c, <8 x i32> %rsrc, i32 15, i1 0, i1 0, i1 0, i1 0)
  ret <4 x float> %tex
}

; Check that WQM is triggered by image samples and left untouched for loads...
;
;CHECK-LABEL: {{^}}test2:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: image_sample
;CHECK-NOT: exec
;CHECK: _load_dword v0,
define amdgpu_ps float @test2(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, <4 x i32> %c) {
main_body:
  %c.1 = call <4 x float> @llvm.SI.image.sample.v4i32(<4 x i32> %c, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %c.2 = bitcast <4 x float> %c.1 to <4 x i32>
  %c.3 = extractelement <4 x i32> %c.2, i32 0
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %c.3
  %data = load float, float addrspace(1)* %gep
  ret float %data
}

; ... but disabled for stores (and, in this simple case, not re-enabled).
;
;CHECK-LABEL: {{^}}test3:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: image_sample
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;CHECK: store
;CHECK-NOT: exec
define amdgpu_ps <4 x float> @test3(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, <4 x i32> %c) {
main_body:
  %tex = call <4 x float> @llvm.SI.image.sample.v4i32(<4 x i32> %c, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %tex.1 = bitcast <4 x float> %tex to <4 x i32>
  %tex.2 = extractelement <4 x i32> %tex.1, i32 0
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %tex.2
  %wr = extractelement <4 x float> %tex, i32 1
  store float %wr, float addrspace(1)* %gep
  ret <4 x float> %tex
}

; Check that WQM is re-enabled when required.
;
;CHECK-LABEL: {{^}}test4:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: v_mul_lo_i32 [[MUL:v[0-9]+]], v0, v1
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;CHECK: store
;CHECK: s_wqm_b64 exec, exec
;CHECK: image_sample v[0:3], [[MUL]], s[0:7], s[8:11] dmask:0xf
define amdgpu_ps <4 x float> @test4(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, i32 %c, i32 %d, float %data) {
main_body:
  %c.1 = mul i32 %c, %d
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %c.1
  store float %data, float addrspace(1)* %gep
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %c.1, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  ret <4 x float> %tex
}

; Check a case of one branch of an if-else requiring WQM, the other requiring
; exact.
;
; Note: In this particular case, the save-and-restore could be avoided if the
; analysis understood that the two branches of the if-else are mutually
; exclusive.
;
;CHECK-LABEL: {{^}}test_control_flow_0:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: %ELSE
;CHECK: s_and_saveexec_b64 [[SAVED:s\[[0-9]+:[0-9]+\]]], [[ORIG]]
;CHECK: store
;CHECK: s_mov_b64 exec, [[SAVED]]
;CHECK: %IF
;CHECK: image_sample
define amdgpu_ps float @test_control_flow_0(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, i32 %c, i32 %z, float %data) {
main_body:
  %cmp = icmp eq i32 %z, 0
  br i1 %cmp, label %IF, label %ELSE

IF:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %c, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %data.if = extractelement <4 x float> %tex, i32 0
  br label %END

ELSE:
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %c
  store float %data, float addrspace(1)* %gep
  br label %END

END:
  %r = phi float [ %data.if, %IF ], [ %data, %ELSE ]
  ret float %r
}

; Reverse branch order compared to the previous test.
;
;CHECK-LABEL: {{^}}test_control_flow_1:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: %IF
;CHECK: image_sample
;CHECK: %Flow
;CHECK-NEXT: s_or_saveexec_b64 [[SAVED:s\[[0-9]+:[0-9]+\]]],
;CHECK-NEXT: s_and_b64 exec, exec, [[ORIG]]
;CHECK-NEXT: s_and_b64 [[SAVED]], exec, [[SAVED]]
;CHECK-NEXT: s_xor_b64 exec, exec, [[SAVED]]
;CHECK-NEXT: %ELSE
;CHECK: store
;CHECK: %END
define amdgpu_ps float @test_control_flow_1(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, i32 %c, i32 %z, float %data) {
main_body:
  %cmp = icmp eq i32 %z, 0
  br i1 %cmp, label %ELSE, label %IF

IF:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %c, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %data.if = extractelement <4 x float> %tex, i32 0
  br label %END

ELSE:
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %c
  store float %data, float addrspace(1)* %gep
  br label %END

END:
  %r = phi float [ %data.if, %IF ], [ %data, %ELSE ]
  ret float %r
}

; Check that branch conditions are properly marked as needing WQM...
;
;CHECK-LABEL: {{^}}test_control_flow_2:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;CHECK: store
;CHECK: s_wqm_b64 exec, exec
;CHECK: load
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;CHECK: store
;CHECK: s_wqm_b64 exec, exec
;CHECK: v_cmp
define amdgpu_ps <4 x float> @test_control_flow_2(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, <3 x i32> %idx, <2 x float> %data, i32 %coord) {
main_body:
  %idx.1 = extractelement <3 x i32> %idx, i32 0
  %gep.1 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.1
  %data.1 = extractelement <2 x float> %data, i32 0
  store float %data.1, float addrspace(1)* %gep.1

  ; The load that determines the branch (and should therefore be WQM) is
  ; surrounded by stores that require disabled WQM.
  %idx.2 = extractelement <3 x i32> %idx, i32 1
  %gep.2 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.2
  %z = load float, float addrspace(1)* %gep.2

  %idx.3 = extractelement <3 x i32> %idx, i32 2
  %gep.3 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.3
  %data.3 = extractelement <2 x float> %data, i32 1
  store float %data.3, float addrspace(1)* %gep.3

  %cc = fcmp ogt float %z, 0.0
  br i1 %cc, label %IF, label %ELSE

IF:
  %coord.IF = mul i32 %coord, 3
  br label %END

ELSE:
  %coord.ELSE = mul i32 %coord, 4
  br label %END

END:
  %coord.END = phi i32 [ %coord.IF, %IF ], [ %coord.ELSE, %ELSE ]
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord.END, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  ret <4 x float> %tex
}

; ... but only if they really do need it.
;
;CHECK-LABEL: {{^}}test_control_flow_3:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: image_sample
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;CHECK: store
;CHECK: load
;CHECK: store
;CHECK: v_cmp
define amdgpu_ps float @test_control_flow_3(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, <3 x i32> %idx, <2 x float> %data, i32 %coord) {
main_body:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %tex.1 = extractelement <4 x float> %tex, i32 0

  %idx.1 = extractelement <3 x i32> %idx, i32 0
  %gep.1 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.1
  %data.1 = extractelement <2 x float> %data, i32 0
  store float %data.1, float addrspace(1)* %gep.1

  %idx.2 = extractelement <3 x i32> %idx, i32 1
  %gep.2 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.2
  %z = load float, float addrspace(1)* %gep.2

  %idx.3 = extractelement <3 x i32> %idx, i32 2
  %gep.3 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.3
  %data.3 = extractelement <2 x float> %data, i32 1
  store float %data.3, float addrspace(1)* %gep.3

  %cc = fcmp ogt float %z, 0.0
  br i1 %cc, label %IF, label %ELSE

IF:
  %tex.IF = fmul float %tex.1, 3.0
  br label %END

ELSE:
  %tex.ELSE = fmul float %tex.1, 4.0
  br label %END

END:
  %tex.END = phi float [ %tex.IF, %IF ], [ %tex.ELSE, %ELSE ]
  ret float %tex.END
}

; Another test that failed at some point because of terminator handling.
;
;CHECK-LABEL: {{^}}test_control_flow_4:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: %IF
;CHECK: load
;CHECK: s_and_saveexec_b64 [[SAVE:s\[[0-9]+:[0-9]+\]]],  [[ORIG]]
;CHECK: store
;CHECK: s_mov_b64 exec, [[SAVE]]
;CHECK: %END
;CHECK: image_sample
define amdgpu_ps <4 x float> @test_control_flow_4(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, i32 %coord, i32 %y, float %z) {
main_body:
  %cond = icmp eq i32 %y, 0
  br i1 %cond, label %IF, label %END

IF:
  %data = load float, float addrspace(1)* %ptr
  %gep = getelementptr float, float addrspace(1)* %ptr, i32 1
  store float %data, float addrspace(1)* %gep
  br label %END

END:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  ret <4 x float> %tex
}

; Kill is performed in WQM mode so that uniform kill behaves correctly ...
;
;CHECK-LABEL: {{^}}test_kill_0:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: image_sample
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;SI: buffer_store_dword
;VI: flat_store_dword
;CHECK: s_wqm_b64 exec, exec
;CHECK: v_cmpx_
;CHECK: s_and_saveexec_b64 [[SAVE:s\[[0-9]+:[0-9]+\]]], [[ORIG]]
;SI: buffer_store_dword
;VI: flat_store_dword
;CHECK: s_mov_b64 exec, [[SAVE]]
;CHECK: image_sample
define amdgpu_ps <4 x float> @test_kill_0(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, <2 x i32> %idx, <2 x float> %data, i32 %coord, i32 %coord2, float %z) {
main_body:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)

  %idx.0 = extractelement <2 x i32> %idx, i32 0
  %gep.0 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.0
  %data.0 = extractelement <2 x float> %data, i32 0
  store float %data.0, float addrspace(1)* %gep.0

  call void @llvm.AMDGPU.kill(float %z)

  %idx.1 = extractelement <2 x i32> %idx, i32 1
  %gep.1 = getelementptr float, float addrspace(1)* %ptr, i32 %idx.1
  %data.1 = extractelement <2 x float> %data, i32 1
  store float %data.1, float addrspace(1)* %gep.1

  %tex2 = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord2, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)
  %out = fadd <4 x float> %tex, %tex2

  ret <4 x float> %out
}

; ... but only if WQM is necessary.
;
;CHECK-LABEL: {{^}}test_kill_1:
;CHECK-NEXT: ; %main_body
;CHECK-NEXT: s_mov_b64 [[ORIG:s\[[0-9]+:[0-9]+\]]], exec
;CHECK-NEXT: s_wqm_b64 exec, exec
;CHECK: image_sample
;CHECK: s_and_b64 exec, exec, [[ORIG]]
;SI: buffer_store_dword
;VI: flat_store_dword
;CHECK-NOT: wqm
;CHECK: v_cmpx_
define amdgpu_ps <4 x float> @test_kill_1(<8 x i32> inreg %rsrc, <4 x i32> inreg %sampler, float addrspace(1)* inreg %ptr, i32 %idx, float %data, i32 %coord, i32 %coord2, float %z) {
main_body:
  %tex = call <4 x float> @llvm.SI.image.sample.i32(i32 %coord, <8 x i32> %rsrc, <4 x i32> %sampler, i32 15, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0)

  %gep = getelementptr float, float addrspace(1)* %ptr, i32 %idx
  store float %data, float addrspace(1)* %gep

  call void @llvm.AMDGPU.kill(float %z)

  ret <4 x float> %tex
}

declare void @llvm.amdgcn.image.store.v4i32(<4 x float>, <4 x i32>, <8 x i32>, i32, i1, i1, i1, i1) #1

declare <4 x float> @llvm.amdgcn.image.load.v4i32(<4 x i32>, <8 x i32>, i32, i1, i1, i1, i1) #2

declare <4 x float> @llvm.SI.image.sample.i32(i32, <8 x i32>, <4 x i32>, i32, i32, i32, i32, i32, i32, i32, i32) #3
declare <4 x float> @llvm.SI.image.sample.v4i32(<4 x i32>, <8 x i32>, <4 x i32>, i32, i32, i32, i32, i32, i32, i32, i32) #3

declare void @llvm.AMDGPU.kill(float)
declare void @llvm.SI.export(i32, i32, i32, i32, i32, float, float, float, float)

attributes #1 = { nounwind }
attributes #2 = { nounwind readonly }
attributes #3 = { nounwind readnone }