llvm/test/Transforms/LoopVectorize/loop-with-constant-exit-condition.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=loop-vectorize -force-vector-width=2 < %s | FileCheck %s

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

define i16 @multiple_exit_one_with_constant_condition(ptr %dst, i64 %x) {
; CHECK-LABEL: @multiple_exit_one_with_constant_condition(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[X:%.*]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ule i64 [[TMP0]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 2
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[N_MOD_VF]], 0
; CHECK-NEXT:    [[TMP2:%.*]] = select i1 [[TMP1]], i64 2, i64 [[N_MOD_VF]]
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[TMP0]], [[TMP2]]
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP3:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT:    [[TMP4:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[DST:%.*]], i64 [[TMP3]]
; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP4]]
; CHECK-NEXT:    store i64 0, ptr [[TMP5]], align 8
; CHECK-NEXT:    store i64 0, ptr [[TMP6]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP7]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       middle.block:
; CHECK-NEXT:    br label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    store i64 0, ptr [[GEP]], align 8
; CHECK-NEXT:    br i1 true, label [[LOOP_THEN:%.*]], label [[EXIT_2:%.*]]
; CHECK:       loop.then:
; CHECK-NEXT:    [[CMP3:%.*]] = icmp ne i64 [[IV]], [[X]]
; CHECK-NEXT:    br i1 [[CMP3]], label [[LOOP_LATCH]], label [[EXIT_1:%.*]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    br label [[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       exit.1:
; CHECK-NEXT:    ret i16 0
; CHECK:       exit.2:
; CHECK-NEXT:    ret i16 1
;
entry:
  br label %loop.header

loop.header:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
  %gep = getelementptr inbounds i32, ptr %dst, i64 %iv
  store i64 0, ptr %gep
  br i1 true, label %loop.then, label %exit.2

loop.then:
  %cmp3 = icmp ne i64 %iv, %x
  br i1 %cmp3, label %loop.latch, label %exit.1

loop.latch:
  %iv.next = add i64 %iv, 1
  br label %loop.header

exit.1:
  ret i16 0

exit.2:
  ret i16 1
}