llvm/test/Transforms/LoopStrengthReduce/callbr-critical-edge-splitting.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-reduce %s -o - -S | FileCheck %s --check-prefix=LEGACYPM
; RUN: opt -passes='loop(loop-reduce)' %s -o - -S | FileCheck %s --check-prefix=NEWPM

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

define dso_local i32 @test1() local_unnamed_addr {
; LEGACYPM-LABEL: @test1(
; LEGACYPM-NEXT:  entry:
; LEGACYPM-NEXT:    br label [[FOR_COND:%.*]]
; LEGACYPM:       for.cond:
; LEGACYPM-NEXT:    callbr void asm sideeffect "", "!i,!i,~{dirflag},~{fpsr},~{flags}"()
; LEGACYPM-NEXT:    to label [[ASM_FALLTHROUGH_I_I:%.*]] [label [[COND_TRUE_I:%.*]], label %for.endsplit]
; LEGACYPM:       asm.fallthrough.i.i:
; LEGACYPM-NEXT:    unreachable
; LEGACYPM:       cond.true.i:
; LEGACYPM-NEXT:    br label [[DO_BODY_I_I_DO_BODY_I_I_CRIT_EDGE:%.*]]
; LEGACYPM:       do.body.i.i.do.body.i.i_crit_edge:
; LEGACYPM-NEXT:    [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], [[DO_BODY_I_I_DO_BODY_I_I_CRIT_EDGE]] ], [ undef, [[COND_TRUE_I]] ]
; LEGACYPM-NEXT:    [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], 1
; LEGACYPM-NEXT:    br i1 true, label [[DO_BODY_I_I_RDRAND_INT_EXIT_I_CRIT_EDGE:%.*]], label [[DO_BODY_I_I_DO_BODY_I_I_CRIT_EDGE]]
; LEGACYPM:       do.body.i.i.rdrand_int.exit.i_crit_edge:
; LEGACYPM-NEXT:    br i1 true, label [[DO_BODY_I_I_RDRAND_INT_EXIT_I_CRIT_EDGE_FOR_END_CRIT_EDGE:%.*]], label [[FOR_INC:%.*]]
; LEGACYPM:       do.body.i.i.rdrand_int.exit.i_crit_edge.for.end_crit_edge:
; LEGACYPM-NEXT:    br label [[FOR_END:%.*]]
; LEGACYPM:       for.inc:
; LEGACYPM-NEXT:    br label [[FOR_COND]]
; LEGACYPM:       for.endsplit:
; LEGACYPM-NEXT:    br label [[FOR_END]]
; LEGACYPM:       for.end:
; LEGACYPM-NEXT:    [[PGOCOUNT_PROMOTED24:%.*]] = phi i64 [ [[LSR_IV_NEXT]], [[DO_BODY_I_I_RDRAND_INT_EXIT_I_CRIT_EDGE_FOR_END_CRIT_EDGE]] ], [ undef, [[FOR_ENDSPLIT:%.*]] ]
; LEGACYPM-NEXT:    ret i32 undef
;
; NEWPM-LABEL: @test1(
; NEWPM-NEXT:  entry:
; NEWPM-NEXT:    br label [[FOR_COND:%.*]]
; NEWPM:       for.cond:
; NEWPM-NEXT:    callbr void asm sideeffect "", "!i,!i,~{dirflag},~{fpsr},~{flags}"()
; NEWPM-NEXT:    to label [[ASM_FALLTHROUGH_I_I:%.*]] [label [[COND_TRUE_I:%.*]], label %for.end]
; NEWPM:       asm.fallthrough.i.i:
; NEWPM-NEXT:    unreachable
; NEWPM:       cond.true.i:
; NEWPM-NEXT:    br label [[DO_BODY_I_I_DO_BODY_I_I_CRIT_EDGE:%.*]]
; NEWPM:       do.body.i.i.do.body.i.i_crit_edge:
; NEWPM-NEXT:    br i1 true, label [[DO_BODY_I_I_RDRAND_INT_EXIT_I_CRIT_EDGE:%.*]], label [[DO_BODY_I_I_DO_BODY_I_I_CRIT_EDGE]]
; NEWPM:       do.body.i.i.rdrand_int.exit.i_crit_edge:
; NEWPM-NEXT:    [[TMP0:%.*]] = add i64 1, undef
; NEWPM-NEXT:    br i1 true, label [[FOR_END:%.*]], label [[FOR_INC:%.*]]
; NEWPM:       for.inc:
; NEWPM-NEXT:    br label [[FOR_COND]]
; NEWPM:       for.end:
; NEWPM-NEXT:    [[PGOCOUNT_PROMOTED24:%.*]] = phi i64 [ undef, [[FOR_COND]] ], [ [[TMP0]], [[DO_BODY_I_I_RDRAND_INT_EXIT_I_CRIT_EDGE]] ]
; NEWPM-NEXT:    ret i32 undef
;
entry:
  br label %for.cond

for.cond:                                         ; preds = %for.inc, %entry
; It's ok to modify this test in the future should we be able to split critical
; edges here, just noting that this is the critical edge that we care about.
  callbr void asm sideeffect "", "!i,!i,~{dirflag},~{fpsr},~{flags}"()
  to label %asm.fallthrough.i.i [label %cond.true.i, label %for.end]

asm.fallthrough.i.i:                              ; preds = %for.cond
  unreachable

cond.true.i:                                      ; preds = %for.cond
  br label %do.body.i.i.do.body.i.i_crit_edge

do.body.i.i.do.body.i.i_crit_edge:                ; preds = %do.body.i.i.do.body.i.i_crit_edge, %cond.true.i
  %pgocount711 = phi i64 [ %0, %do.body.i.i.do.body.i.i_crit_edge ], [ 0, %cond.true.i ]
  %0 = add nuw nsw i64 %pgocount711, 1
  br i1 undef, label %do.body.i.i.rdrand_int.exit.i_crit_edge, label %do.body.i.i.do.body.i.i_crit_edge

do.body.i.i.rdrand_int.exit.i_crit_edge:          ; preds = %do.body.i.i.do.body.i.i_crit_edge
  %1 = add i64 %0, undef
  br i1 undef, label %for.end, label %for.inc

for.inc:                                          ; preds = %do.body.i.i.rdrand_int.exit.i_crit_edge
  br label %for.cond

for.end:                                          ; preds = %do.body.i.i.rdrand_int.exit.i_crit_edge, %for.cond
  %pgocount.promoted24 = phi i64 [ undef, %for.cond ], [ %1, %do.body.i.i.rdrand_int.exit.i_crit_edge ]
  ret i32 undef
}