File: trivial-join-at-loop-exit.ll

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llvm-toolchain-17 1%3A17.0.6-22
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; RUN: opt -mtriple amdgcn-unknown-amdhsa -passes='print<uniformity>' -disable-output %s 2>&1 | FileCheck %s

; CHECK-NOT: DIVERGENT:       %Guard.bb2 = phi i1 [ true, %bb1 ], [ false, %bb0 ]

; Function Attrs: nounwind readnone speculatable
declare i32 @llvm.amdgcn.workitem.id.x() #0

define protected amdgpu_kernel void @test2(i1 %uni) {
bb0:
  %tid.x = call i32 @llvm.amdgcn.workitem.id.x()
  %i5 = icmp eq i32 %tid.x, -1
  br i1 %uni, label %bb1, label %bb2

bb1:                                              ; preds = %bb2, %bb0
  %lsr.iv = phi i32 [ 7, %bb0 ], [ %lsr.iv.next, %bb1 ]
  %lsr.iv.next = add nsw i32 %lsr.iv, -1
  br i1 %i5, label %bb2, label %bb1

bb2:                                              ; preds = %bb2, %bb1
  %Guard.bb2 = phi i1 [ true, %bb1 ], [ false, %bb0 ]
  ret void
}

attributes #0 = { nounwind readnone speculatable }