[AMDGPU] Enable LICM in the BE pipeline

[rampitec]

Summary

This allows to hoist code portion to compute reciprocal of loop
invariant denominator in integer division after codegen prepare
expansion.

[rampitec]

Rebase.

[arsenm]

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

635

Why here? Does this trigger a dominator tree recalculation? If so can it be moved somewhere else where it's already available?

[rampitec]

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

635

I can move it into the top of addStraightLineScalarOptimizationPasses(). This will be after the SROA, so DT will exist.

[rampitec]

Moved LICM post SROA.

[arsenm]

LGTM

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

void AMDGPUPassConfig::addIRPasses() {
   // Handle uses of OpenCL image2d_t, image3d_t and sampler_t arguments.
   if (TM.getTargetTriple().getArch() == Triple::r600)
     addPass(createR600OpenCLImageTypeLoweringPass());
 
   // Replace OpenCL enqueued block function pointers with global variables.
   addPass(createAMDGPUOpenCLEnqueuedBlockLoweringPass());
 
   if (TM.getOptLevel() > CodeGenOpt::None) {
+    addPass(createLICMPass());
     addPass(createInferAddressSpacesPass());
     addPass(createAMDGPUPromoteAlloca());
 
     if (EnableSROA)
       addPass(createSROAPass());
 
     addStraightLineScalarOptimizationPasses();
 

test/CodeGen/AMDGPU/amdpal_scratch_mergedshader.ll

.beginls:                                         ; preds = %.entry
   %tmp15 = extractelement <6 x i32> %arg8, i32 3
   %.0.vec.insert.i = insertelement <2 x i32> undef, i32 %tmp15, i32 0
   %.4.vec.insert.i = shufflevector <2 x i32> %.0.vec.insert.i, <2 x i32> undef, <2 x i32> <i32 0, i32 3>
   %tmp16 = bitcast <2 x i32> %.4.vec.insert.i to i64
   br label %.endls
 
 .endls:                                           ; preds = %.beginls, %.entry
   %.fca.2.gep120.i = getelementptr inbounds [3 x <4 x float>], [3 x <4 x float>] addrspace(5)* %__llpc_global_proxy_7.i, i64 0, i64 2
-  store <4 x float> <float 9.000000e+00, float 1.000000e+01, float 1.100000e+01, float 1.200000e+01>, <4 x float> addrspace(5)* %.fca.2.gep120.i, align 16
+  store volatile <4 x float> <float 9.000000e+00, float 1.000000e+01, float 1.100000e+01, float 1.200000e+01>, <4 x float> addrspace(5)* %.fca.2.gep120.i, align 16
   br label %bb
 
 bb:                                               ; preds = %bb, %.endls
   %lsr.iv182 = phi [3 x <4 x float>] addrspace(5)* [ undef, %bb ], [ %__llpc_global_proxy_7.i, %.endls ]
   %scevgep183 = getelementptr [3 x <4 x float>], [3 x <4 x float>] addrspace(5)* %lsr.iv182, i32 0, i32 1
   br label %bb
 }

test/CodeGen/AMDGPU/collapse-endcf.ll

 ; Make sure scc liveness is updated if sor_b64 is removed
 ; GCN-LABEL: {{^}}scc_liveness:
 
 ; GCN: [[BB1_LOOP:BB[0-9]+_[0-9]+]]:
 ; GCN: s_andn2_b64 exec, exec,
 ; GCN-NEXT: s_cbranch_execnz [[BB1_LOOP]]
 
 ; GCN: buffer_load_dword v{{[0-9]+}}, v{{[0-9]+}}, s{{\[[0-9]+:[0-9]+\]}}, s{{[0-9]+}} offen
-; GCN: s_and_b64 exec, exec, vcc
+; GCN: s_and_b64 exec, exec, {{vcc|s\[[0-9:]+\]}}
 
 ; GCN-NOT: s_or_b64 exec, exec
 
 ; GCN: s_or_b64 exec, exec, s{{\[[0-9]+:[0-9]+\]}}
 ; GCN: s_andn2_b64
 ; GCN-NEXT: s_cbranch_execnz
 
 ; GCN: s_or_b64 exec, exec, s{{\[[0-9]+:[0-9]+\]}}

test/CodeGen/AMDGPU/i1-copy-from-loop.ll

 ; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 ; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 
 ; SI-LABEL: {{^}}i1_copy_from_loop:
 ;
 ; Cannot use an SGPR mask to copy %cc out of the loop, since the mask would
 ; only contain the lanes that were active during the last loop iteration.
 ;
 ; SI: ; %for.body
-; SI: v_cmp_gt_u32_e64 [[SREG:s\[[0-9]+:[0-9]+\]]], 4,
-; SI: v_cndmask_b32_e64 [[VREG:v[0-9]+]], 0, -1, [[SREG]]
-; SI-NOT: [[VREG]]
-; SI: ; %for.end
-; SI: v_cmp_ne_u32_e32 vcc, 0, [[VREG]]
+; SI:      v_cmp_gt_u32_e64 [[SREG:s\[[0-9]+:[0-9]+\]]], 4,
+; SI:      v_cndmask_b32_e64 [[VREG:v[0-9]+]], 0, -1, [[SREG]]
+; SI-NEXT: s_cbranch_vccnz [[ENDIF:BB[0-9_]+]]
+; SI:      [[ENDIF]]:
+; SI-NOT:  [[VREG]]
+; SI:      ; %for.end
+; SI:      v_cmp_ne_u32_e32 vcc, 0, [[VREG]]
 define amdgpu_ps void @i1_copy_from_loop(<4 x i32> inreg %rsrc, i32 %tid) {
 entry:
   br label %for.body
 
 for.body:
   %i = phi i32 [0, %entry], [%i.inc, %end.loop]
   %cc = icmp ult i32 %i, 4
   br i1 %cc, label %mid.loop, label %for.end

test/CodeGen/AMDGPU/idiv-licm.ll

+; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=GCN %s
+
+; GCN-LABEL: {{^}}udiv32_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     v_mul_f32_e32 v{{[0-9]+}}, 0x4f800000,
+; GCN:     v_cvt_u32_f32_e32
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_mul_lo_i32
+; GCN-DAG: v_sub_i32_e32
+; GCN-DAG: v_cmp_eq_u32_e64
+; GCN-DAG: v_cndmask_b32_e64
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_add_i32_e32
+; GCN-DAG: v_subrev_i32_e32
+; GCN-DAG: v_cndmask_b32_e64
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @udiv32_invariant_denom(i32 addrspace(1)* nocapture %arg, i32 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i32 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = udiv i32 %tmp, %arg1
+  %tmp5 = zext i32 %tmp to i64
+  %tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp5
+  store i32 %tmp4, i32 addrspace(1)* %tmp6, align 4
+  %tmp7 = add nuw nsw i32 %tmp, 1
+  %tmp8 = icmp eq i32 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}urem32_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     v_mul_f32_e32 v{{[0-9]+}}, 0x4f800000,
+; GCN:     v_cvt_u32_f32_e32
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_mul_lo_i32
+; GCN-DAG: v_sub_i32_e32
+; GCN-DAG: v_cmp_eq_u32_e64
+; GCN-DAG: v_cndmask_b32_e64
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_add_i32_e32
+; GCN-DAG: v_subrev_i32_e32
+; GCN-DAG: v_cndmask_b32_e64
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @urem32_invariant_denom(i32 addrspace(1)* nocapture %arg, i32 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i32 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = urem i32 %tmp, %arg1
+  %tmp5 = zext i32 %tmp to i64
+  %tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp5
+  store i32 %tmp4, i32 addrspace(1)* %tmp6, align 4
+  %tmp7 = add nuw nsw i32 %tmp, 1
+  %tmp8 = icmp eq i32 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}sdiv32_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     v_mul_f32_e32 v{{[0-9]+}}, 0x4f800000,
+; GCN:     v_cvt_u32_f32_e32
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_mul_lo_i32
+; GCN-DAG: v_sub_i32_e32
+; GCN-DAG: v_cmp_eq_u32_e64
+; GCN-DAG: v_cndmask_b32_e64
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_add_i32_e32
+; GCN-DAG: v_subrev_i32_e32
+; GCN-DAG: v_cndmask_b32_e64
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @sdiv32_invariant_denom(i32 addrspace(1)* nocapture %arg, i32 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i32 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = sdiv i32 %tmp, %arg1
+  %tmp5 = zext i32 %tmp to i64
+  %tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp5
+  store i32 %tmp4, i32 addrspace(1)* %tmp6, align 4
+  %tmp7 = add nuw nsw i32 %tmp, 1
+  %tmp8 = icmp eq i32 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}srem32_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     v_mul_f32_e32 v{{[0-9]+}}, 0x4f800000,
+; GCN:     v_cvt_u32_f32_e32
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_mul_lo_i32
+; GCN-DAG: v_sub_i32_e32
+; GCN-DAG: v_cmp_eq_u32_e64
+; GCN-DAG: v_cndmask_b32_e64
+; GCN-DAG: v_mul_hi_u32
+; GCN-DAG: v_add_i32_e32
+; GCN-DAG: v_subrev_i32_e32
+; GCN-DAG: v_cndmask_b32_e64
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @srem32_invariant_denom(i32 addrspace(1)* nocapture %arg, i32 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i32 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = srem i32 %tmp, %arg1
+  %tmp5 = zext i32 %tmp to i64
+  %tmp6 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 %tmp5
+  store i32 %tmp4, i32 addrspace(1)* %tmp6, align 4
+  %tmp7 = add nuw nsw i32 %tmp, 1
+  %tmp8 = icmp eq i32 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}udiv16_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @udiv16_invariant_denom(i16 addrspace(1)* nocapture %arg, i16 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i16 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = udiv i16 %tmp, %arg1
+  %tmp5 = zext i16 %tmp to i64
+  %tmp6 = getelementptr inbounds i16, i16 addrspace(1)* %arg, i64 %tmp5
+  store i16 %tmp4, i16 addrspace(1)* %tmp6, align 2
+  %tmp7 = add nuw nsw i16 %tmp, 1
+  %tmp8 = icmp eq i16 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}urem16_invariant_denom:
+; GCN:     v_cvt_f32_u32
+; GCN:     v_rcp_iflag_f32
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @urem16_invariant_denom(i16 addrspace(1)* nocapture %arg, i16 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i16 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = urem i16 %tmp, %arg1
+  %tmp5 = zext i16 %tmp to i64
+  %tmp6 = getelementptr inbounds i16, i16 addrspace(1)* %arg, i64 %tmp5
+  store i16 %tmp4, i16 addrspace(1)* %tmp6, align 2
+  %tmp7 = add nuw nsw i16 %tmp, 1
+  %tmp8 = icmp eq i16 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}sdiv16_invariant_denom:
+; GCN-DAG: s_sext_i32_i16
+; GCN-DAG: v_and_b32_e32 v{{[0-9]+}}, 0x7fffffff
+; GCN-DAG: v_cvt_f32_i32
+; GCN-DAG: v_rcp_iflag_f32
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @sdiv16_invariant_denom(i16 addrspace(1)* nocapture %arg, i16 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i16 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = sdiv i16 %tmp, %arg1
+  %tmp5 = zext i16 %tmp to i64
+  %tmp6 = getelementptr inbounds i16, i16 addrspace(1)* %arg, i64 %tmp5
+  store i16 %tmp4, i16 addrspace(1)* %tmp6, align 2
+  %tmp7 = add nuw nsw i16 %tmp, 1
+  %tmp8 = icmp eq i16 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}
+
+; GCN-LABEL: {{^}}srem16_invariant_denom:
+; GCN-DAG: s_sext_i32_i16
+; GCN-DAG: v_and_b32_e32 v{{[0-9]+}}, 0x7fffffff
+; GCN-DAG: v_cvt_f32_i32
+; GCN-DAG: v_rcp_iflag_f32
+; GCN:     [[LOOP:BB[0-9_]+]]:
+; GCN-NOT: v_rcp
+; GCN:     s_cbranch_scc0 [[LOOP]]
+; GCN:     s_endpgm
+define amdgpu_kernel void @srem16_invariant_denom(i16 addrspace(1)* nocapture %arg, i16 %arg1) {
+bb:
+  br label %bb3
+
+bb2:                                              ; preds = %bb3
+  ret void
+
+bb3:                                              ; preds = %bb3, %bb
+  %tmp = phi i16 [ 0, %bb ], [ %tmp7, %bb3 ]
+  %tmp4 = srem i16 %tmp, %arg1
+  %tmp5 = zext i16 %tmp to i64
+  %tmp6 = getelementptr inbounds i16, i16 addrspace(1)* %arg, i64 %tmp5
+  store i16 %tmp4, i16 addrspace(1)* %tmp6, align 2
+  %tmp7 = add nuw nsw i16 %tmp, 1
+  %tmp8 = icmp eq i16 %tmp7, 1024
+  br i1 %tmp8, label %bb2, label %bb3
+}

test/CodeGen/AMDGPU/infinite-loop.ll

 ; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
 ; RUN: opt -mtriple=amdgcn-- -S -amdgpu-unify-divergent-exit-nodes -verify %s | FileCheck -check-prefix=IR %s
 
 ; SI-LABEL: {{^}}infinite_loop:
 ; SI: v_mov_b32_e32 [[REG:v[0-9]+]], 0x3e7
 ; SI: [[LOOP:BB[0-9]+_[0-9]+]]:  ; %loop
 ; SI: s_waitcnt lgkmcnt(0)
 ; SI: buffer_store_dword [[REG]]
 ; SI: s_branch [[LOOP]]
 define amdgpu_kernel void @infinite_loop(i32 addrspace(1)* %out) {
 entry:
   br label %loop
 
 loop:
-  store i32 999, i32 addrspace(1)* %out, align 4
+  store volatile i32 999, i32 addrspace(1)* %out, align 4
   br label %loop
 }
 
 
 ; IR-LABEL: @infinite_loop_ret(
 ; IR:  br i1 %cond, label %loop, label %UnifiedReturnBlock
 
 ; IR: loop:
-; IR: store i32 999, i32 addrspace(1)* %out, align 4
+; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
 ; IR: br i1 true, label %loop, label %UnifiedReturnBlock
 
 ; IR: UnifiedReturnBlock:
 ; IR:  ret void
 
 
 ; SI-LABEL: {{^}}infinite_loop_ret:
 ; SI: s_cbranch_execz [[RET:BB[0-9]+_[0-9]+]]

 ; SI: s_endpgm
 define amdgpu_kernel void @infinite_loop_ret(i32 addrspace(1)* %out) {
 entry:
   %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
   %cond = icmp eq i32 %tmp, 1
   br i1 %cond, label %loop, label %return
 
 loop:
-  store i32 999, i32 addrspace(1)* %out, align 4
+  store volatile i32 999, i32 addrspace(1)* %out, align 4
   br label %loop
 
 return:
   ret void
 }
 
 
 ; IR-LABEL: @infinite_loops(
 ; IR: br i1 undef, label %loop1, label %loop2
 
 ; IR: loop1:
-; IR: store i32 999, i32 addrspace(1)* %out, align 4
+; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
 ; IR: br i1 true, label %loop1, label %DummyReturnBlock
 
 ; IR: loop2:
-; IR: store i32 888, i32 addrspace(1)* %out, align 4
+; IR: store volatile i32 888, i32 addrspace(1)* %out, align 4
 ; IR: br i1 true, label %loop2, label %DummyReturnBlock
 
 ; IR: DummyReturnBlock:
 ; IR: ret void
 
 
 ; SI-LABEL: {{^}}infinite_loops:
 

 
 ; SI: [[RET]]:  ; %DummyReturnBlock
 ; SI: s_endpgm
 define amdgpu_kernel void @infinite_loops(i32 addrspace(1)* %out) {
 entry:
   br i1 undef, label %loop1, label %loop2
 
 loop1:
-  store i32 999, i32 addrspace(1)* %out, align 4
+  store volatile i32 999, i32 addrspace(1)* %out, align 4
   br label %loop1
 
 loop2:
-  store i32 888, i32 addrspace(1)* %out, align 4
+  store volatile i32 888, i32 addrspace(1)* %out, align 4
   br label %loop2
 }
 
 
 
 ; IR-LABEL: @infinite_loop_nest_ret(
 ; IR: br i1 %cond1, label %outer_loop, label %UnifiedReturnBlock
 
 ; IR: outer_loop:
 ; IR: br label %inner_loop
 
 ; IR: inner_loop:
-; IR: store i32 999, i32 addrspace(1)* %out, align 4
+; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
 ; IR: %cond3 = icmp eq i32 %tmp, 3
 ; IR: br i1 true, label %TransitionBlock, label %UnifiedReturnBlock
 
 ; IR: TransitionBlock:
 ; IR: br i1 %cond3, label %inner_loop, label %outer_loop
 
 ; IR: UnifiedReturnBlock:
 ; IR: ret void
 
 ; SI-LABEL: {{^}}infinite_loop_nest_ret:
 ; SI: s_cbranch_execz [[RET:BB[0-9]+_[0-9]+]]
 
 ; SI: s_mov_b32
 ; SI: [[OUTER_LOOP:BB[0-9]+_[0-9]+]]:  ; %outer_loop
 
 ; SI: [[INNER_LOOP:BB[0-9]+_[0-9]+]]:  ; %inner_loop
 ; SI: s_waitcnt expcnt(0)
 ; SI: v_mov_b32_e32 [[REG:v[0-9]+]], 0x3e7
-; SI: v_cmp_ne_u32_e32
 ; SI: s_waitcnt lgkmcnt(0)
 ; SI: buffer_store_dword [[REG]]
 
 ; SI: s_andn2_b64 exec
 ; SI: s_cbranch_execnz [[INNER_LOOP]]
 
 ; SI: s_andn2_b64 exec
 ; SI: s_cbranch_execnz [[OUTER_LOOP]]
 
 ; SI: [[RET]]:  ; %UnifiedReturnBlock
 ; SI: s_endpgm
 define amdgpu_kernel void @infinite_loop_nest_ret(i32 addrspace(1)* %out) {
 entry:
   %tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
   %cond1 = icmp eq i32 %tmp, 1
   br i1 %cond1, label %outer_loop, label %return
 
 outer_loop:
  ; %cond2 = icmp eq i32 %tmp, 2
  ; br i1 %cond2, label %outer_loop, label %inner_loop
  br label %inner_loop
 
 inner_loop:                                     ; preds = %LeafBlock, %LeafBlock1
-  store i32 999, i32 addrspace(1)* %out, align 4
+  store volatile i32 999, i32 addrspace(1)* %out, align 4
   %cond3 = icmp eq i32 %tmp, 3
   br i1 %cond3, label %inner_loop, label %outer_loop
 
 return:
   ret void
 }
 
 declare i32 @llvm.amdgcn.workitem.id.x()

test/CodeGen/AMDGPU/multilevel-break.ll

 ; Ensure extra or eliminated
 ; GCN-NEXT: s_or_b64 exec, exec, [[SAVE_BREAK]]
 ; GCN-NEXT: s_mov_b64
 ; GCN-NEXT: s_and_b64 [[MASKED_SAVE_BREAK:s\[[0-9]+:[0-9]+\]]], exec, [[SAVE_BREAK]]
 ; GCN-NEXT: s_or_b64 [[OR_BREAK:s\[[0-9]+:[0-9]+\]]], [[MASKED_SAVE_BREAK]], s{{\[[0-9]+:[0-9]+\]}}
 ; GCN-NEXT: s_andn2_b64 exec, exec, [[OR_BREAK]]
 ; GCN-NEXT: s_cbranch_execnz [[INNER_LOOP]]
 
-; GCN: ; %bb.{{[0-9]+}}: ; %Flow1{{$}}
+; GCN: ; %bb.{{[0-9]+}}: ; %Flow2{{$}}
 ; GCN-NEXT: ; in Loop: Header=[[OUTER_LOOP]] Depth=1
 
 ; Ensure copy is eliminated
 ; GCN-NEXT: s_or_b64 exec, exec, [[OR_BREAK]]
 ; GCN-NEXT: s_and_b64 [[MASKED2_SAVE_BREAK:s\[[0-9]+:[0-9]+\]]], exec, [[SAVE_BREAK]]
 ; GCN-NEXT: s_or_b64 [[OUTER_OR_BREAK:s\[[0-9]+:[0-9]+\]]], [[MASKED2_SAVE_BREAK]], s{{\[[0-9]+:[0-9]+\]}}
 ; GCN-NEXT: s_andn2_b64 exec, exec, [[OUTER_OR_BREAK]]
 ; GCN-NEXT: s_cbranch_execnz [[OUTER_LOOP]]

test/CodeGen/AMDGPU/si-annotate-cf.ll

-; RUN: llc < %s -march=amdgcn -mcpu=verde -verify-machineinstrs | FileCheck --check-prefix=SI --check-prefix=FUNC %s
-; RUN: llc < %s -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -verify-machineinstrs | FileCheck --check-prefix=SI --check-prefix=FUNC %s
+; RUN: llc < %s -march=amdgcn -mcpu=verde -asm-verbose=0 -verify-machineinstrs | FileCheck --check-prefix=SI --check-prefix=FUNC %s
+; RUN: llc < %s -march=amdgcn -mcpu=tonga -mattr=-flat-for-global -asm-verbose=0 -verify-machineinstrs | FileCheck --check-prefix=SI --check-prefix=FUNC %s
 
 ; FUNC-LABEL: {{^}}break_inserted_outside_of_loop:
 
 ; SI: [[LOOP_LABEL:[A-Z0-9]+]]:
 ; Lowered break instructin:
 ; SI: s_or_b64
 ; Lowered Loop instruction:
 ; SI: s_andn2_b64

 sw.epilog:
   ret void
 }
 
 declare float @llvm.fabs.f32(float) nounwind readnone
 
 ; This broke the old AMDIL cfg structurizer
 ; FUNC-LABEL: {{^}}loop_land_info_assert:
-; SI: s_cmp_lt_i32
-; SI-NEXT: s_cbranch_scc1 [[ENDPGM:BB[0-9]+_[0-9]+]]
-
-; SI: s_cmpk_lt_i32
-; SI-NEXT: s_cbranch_scc0 [[ENDPGM]]
-
-; SI: [[INFLOOP:BB[0-9]+_[0-9]+]]
-; SI: s_cbranch_vccnz [[INFLOOP]]
+; SI:      v_cmp_lt_i32_e64 [[CMP4:s\[[0-9:]+\]]], s{{[0-9]+}}, 4{{$}}
+; SI:      s_and_b64 vcc, exec, [[CMP4]]
+; SI-NEXT: s_cbranch_vccnz [[BR1:BB[0-9_]+]]
+; SI-NEXT: s_branch [[BR2:BB[0-9_]+]]
+; SI-NEXT: BB{{[0-9_]+}}:
+; SI-NEXT: buffer_store_dword
+
+; SI:      [[INFLOOP:BB[0-9]+_[0-9]+]]:
+
+; SI:      [[BR1]]:
+; SI-NEXT: s_and_b64 vcc, exec,
+; SI-NEXT: s_cbranch_vccnz [[ENDPGM:BB[0-9]+_[0-9]+]]
+; SI:      s_branch [[INFLOOP]]
+; SI-NEXT: [[BR2]]:
+; SI:      s_cbranch_vccz [[ENDPGM]]
 
-; SI: [[ENDPGM]]:
-; SI: s_endpgm
+; SI:      [[ENDPGM]]:
+; SI-NEXT: s_endpgm
 define amdgpu_kernel void @loop_land_info_assert(i32 %c0, i32 %c1, i32 %c2, i32 %c3, i32 %x, i32 %y, i1 %arg) nounwind {
 entry:
   %cmp = icmp sgt i32 %c0, 0
   br label %while.cond.outer
 
 while.cond.outer:
   %tmp = load float, float addrspace(1)* undef
   br label %while.cond

 
 self.loop:
  br label %self.loop
 
 return:
   ret void
 }
 
-
 declare i32 @llvm.amdgcn.mbcnt.lo(i32, i32) #0
 
 attributes #0 = { nounwind readnone }

test/CodeGen/AMDGPU/smrd.ll

.inner_loop_header:                                     ; preds = %.inner_loop_body, %.outer_loop_header
   %loopctr.1 = phi i32 [ 0, %.outer_loop_header ], [ %loopctr.2, %.inner_loop_body ]
   %loopctr.2 = add i32 %loopctr.1, 1
   %inner_br1 = icmp slt i32 %loopctr.2, 10
   br i1 %inner_br1, label %.inner_loop_body, label %ret_block
 
 .inner_loop_body:
   %descriptor = load <4 x i32>, <4 x i32> addrspace(4)* %descptr, align 16, !invariant.load !0
   %load1result = call float @llvm.SI.load.const.v4i32(<4 x i32> %descriptor, i32 0)
+  store float %load1result, float addrspace(1)* undef
   %inner_br2 = icmp uge i32 %1, 10
   br i1 %inner_br2, label %.inner_loop_header, label %.outer_loop_body
 
 .outer_loop_body:
   %offset = shl i32 %loopctr.2, 6
   %load2result = call float @llvm.SI.load.const.v4i32(<4 x i32> %descriptor, i32 %offset)
   %outer_br = fcmp ueq float %load2result, 0x0
   br i1 %outer_br, label %.outer_loop_header, label %ret_block