peel-loop-pgo-deopt-idom.ll

; REQUIRES: asserts
; RUN: opt < %s -S -debug-only=loop-unroll -loop-unroll -unroll-runtime -unroll-peel-multi-deopt-exit 2>&1 | FileCheck %s
; RUN: opt < %s -S -debug-only=loop-unroll -unroll-peel-multi-deopt-exit -passes='require<profile-summary>,function(require<opt-remark-emit>,loop-unroll)' 2>&1 | FileCheck %s

; Regression test for setting the correct idom for exit blocks.

; CHECK: Loop Unroll: F[basic]
; CHECK: PEELING loop %for.body with iteration count 2!

define i32 @basic(i32* %p, i32 %k, i1 %c1, i1 %c2) #0 !prof !3 {
entry:
  %cmp3 = icmp slt i32 0, %k
  br i1 %cmp3, label %for.body.lr.ph, label %for.end

for.body.lr.ph:                                   ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.lr.ph, %for.body
  %i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %latch ]
  %p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %latch ]
  %incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
  store i32 %i.05, i32* %p.addr.04, align 4
  %inc = add nsw i32 %i.05, 1
  %cmp = icmp slt i32 %inc, %k
  br i1 %c1, label %continue, label %to_side_exit

continue:
  br i1 %c2, label %latch, label %side_exit, !prof !2

latch:
  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !1

for.cond.for.end_crit_edge:                       ; preds = %for.body
  br label %for.end

to_side_exit:
  br i1 %c2, label %continue, label %side_exit, !prof !2


for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
  %res = phi i32 [ 0, %entry ], [ %inc, %for.cond.for.end_crit_edge ]
  ret i32 %res

side_exit:
  %rval = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %inc) ]
  ret i32 %rval
}

declare i32 @llvm.experimental.deoptimize.i32(...)

attributes #0 = { nounwind }

!1 = !{!"branch_weights", i32 1, i32 1}
!2 = !{!"branch_weights", i32 1, i32 0}
!3 = !{!"function_entry_count", i64 1}