| ; RUN: opt -mtriple amdgcn-unknown-amdhsa -passes='print<divergence>' -disable-output %s 2>&1 | FileCheck %s |
| |
| define amdgpu_kernel void @hidden_diverge(i32 %n, i32 %a, i32 %b) #0 { |
| ; CHECK-LABEL: 'Divergence Analysis' for function 'hidden_diverge' |
| entry: |
| %tid = call i32 @llvm.amdgcn.workitem.id.x() |
| %cond.var = icmp slt i32 %tid, 0 |
| br i1 %cond.var, label %B, label %C ; divergent |
| ; CHECK: DIVERGENT: br i1 %cond.var, |
| B: |
| %cond.uni = icmp slt i32 %n, 0 |
| br i1 %cond.uni, label %C, label %merge ; uniform |
| ; CHECK-NOT: DIVERGENT: br i1 %cond.uni, |
| C: |
| %phi.var.hidden = phi i32 [ 1, %entry ], [ 2, %B ] |
| ; CHECK: DIVERGENT: %phi.var.hidden = phi i32 |
| br label %merge |
| merge: |
| %phi.ipd = phi i32 [ %a, %B ], [ %b, %C ] |
| ; CHECK: DIVERGENT: %phi.ipd = phi i32 |
| ret void |
| } |
| |
| define amdgpu_kernel void @hidden_loop_ipd(i32 %n, i32 %a, i32 %b) #0 { |
| ; CHECK-LABEL: 'Divergence Analysis' for function 'hidden_loop_ipd' |
| entry: |
| %tid = call i32 @llvm.amdgcn.workitem.id.x() |
| %cond.var = icmp slt i32 %tid, 0 |
| ; CHECK: DIVERGENT: %cond.var = icmp |
| %cond.uni = icmp slt i32 %n, 0 |
| ; CHECK-NOT: DIVERGENT: %cond.uni = icmp |
| br label %for.header |
| for.header: |
| br i1 %cond.var, label %A, label %B |
| A: |
| br label %C |
| B: |
| br label %C |
| C: |
| br i1 %cond.uni, label %E, label %D |
| D: |
| br i1 %cond.var, label %for.header, label %F |
| |
| E: |
| %e.lcssa.uni = phi i32 [ 0, %C ] |
| ; CHECK-NOT: DIVERGENT: %e.lcssa.uni = phi i32 |
| br label %G |
| |
| F: |
| %f.lcssa.uni = phi i32 [ 1, %D ] |
| ; CHECK-NOT: DIVERGENT: %f.lcssa.uni = phi i32 |
| br label %G |
| |
| G: |
| %g.join.var = phi i32 [ %e.lcssa.uni, %E ], [ %f.lcssa.uni, %F ] |
| ; CHECK: DIVERGENT: %g.join.var = phi i32 |
| ret void |
| } |
| |
| |
| declare i32 @llvm.amdgcn.workitem.id.x() #0 |
| |
| attributes #0 = { nounwind readnone } |