File: hidden_diverge.ll

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llvm-toolchain-19 1%3A19.1.7-3
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; RUN: opt %s -passes='print<uniformity>' -disable-output 2>&1 | FileCheck %s

target datalayout = "e-i64:64-v16:16-v32:32-n16:32:64"
target triple = "nvptx64-nvidia-cuda"

define i32 @hidden_diverge(i32 %n, i32 %a, i32 %b) {
; CHECK-LABEL: for function 'hidden_diverge'
entry:
  %tid = call i32 @llvm.nvvm.read.ptx.sreg.tid.x()
  %cond.var = icmp slt i32 %tid, 0
  br i1 %cond.var, label %B, label %C ; divergent
; CHECK:  DIVERGENT: %cond.var =
; 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: %cond.uni =
; 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 i32 %phi.ipd
}

declare i32 @llvm.nvvm.read.ptx.sreg.tid.x()

!nvvm.annotations = !{!0}
!0 = !{ptr @hidden_diverge, !"kernel", i32 1}