test/Transforms/LoopVectorize/multi_early_exit_live_outs.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -S < %s -p loop-vectorize -enable-early-exit-vectorization | FileCheck %s

declare void @init_mem(ptr, i64);

; There are multiple exit blocks - two of them have an exact representation for the
; exit-not-taken counts and the other is unknown, i.e. the "early exit".
define i64 @one_uncountable_two_countable_same_exit() {
; CHECK-LABEL: define i64 @one_uncountable_two_countable_same_exit() {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; CHECK-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; CHECK-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; CHECK-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ [[INDEX_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ 3, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i64 [[INDEX]], 64
; CHECK-NEXT:    br i1 [[CMP1]], label [[SEARCH:%.*]], label [[LOOP_END:%.*]]
; CHECK:       search:
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[INDEX]]
; CHECK-NEXT:    [[LD1:%.*]] = load i8, ptr [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[INDEX]]
; CHECK-NEXT:    [[LD2:%.*]] = load i8, ptr [[ARRAYIDX1]], align 1
; CHECK-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; CHECK-NEXT:    br i1 [[CMP3]], label [[LOOP_END]], label [[LOOP_INC]]
; CHECK:       loop.inc:
; CHECK-NEXT:    [[INDEX_NEXT]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[INDEX_NEXT]], 128
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]]
; CHECK:       loop.end:
; CHECK-NEXT:    [[RETVAL:%.*]] = phi i64 [ 64, [[LOOP]] ], [ [[INDEX]], [[SEARCH]] ], [ 128, [[LOOP_INC]] ]
; CHECK-NEXT:    ret i64 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %index = phi i64 [ %index.next, %loop.inc ], [ 3, %entry ]
  %cmp1 = icmp ne i64 %index, 64
  br i1 %cmp1, label %search, label %loop.end

search:
  %arrayidx = getelementptr inbounds i8, ptr %p1, i64 %index
  %ld1 = load i8, ptr %arrayidx, align 1
  %arrayidx1 = getelementptr inbounds i8, ptr %p2, i64 %index
  %ld2 = load i8, ptr %arrayidx1, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.end, label %loop.inc

loop.inc:
  %index.next = add i64 %index, 1
  %exitcond = icmp ne i64 %index.next, 128
  br i1 %exitcond, label %loop, label %loop.end

loop.end:
  %retval = phi i64 [ 64, %loop ], [ %index, %search ], [ 128, %loop.inc ]
  ret i64 %retval
}


define i64 @one_uncountable_two_countable_diff_exit() {
; CHECK-LABEL: define i64 @one_uncountable_two_countable_diff_exit() {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[P1:%.*]] = alloca [1024 x i8], align 1
; CHECK-NEXT:    [[P2:%.*]] = alloca [1024 x i8], align 1
; CHECK-NEXT:    call void @init_mem(ptr [[P1]], i64 1024)
; CHECK-NEXT:    call void @init_mem(ptr [[P2]], i64 1024)
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ [[INDEX_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ 3, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i64 [[INDEX]], 64
; CHECK-NEXT:    br i1 [[CMP1]], label [[SEARCH:%.*]], label [[LOOP_END:%.*]]
; CHECK:       search:
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i8, ptr [[P1]], i64 [[INDEX]]
; CHECK-NEXT:    [[LD1:%.*]] = load i8, ptr [[ARRAYIDX]], align 1
; CHECK-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds i8, ptr [[P2]], i64 [[INDEX]]
; CHECK-NEXT:    [[LD2:%.*]] = load i8, ptr [[ARRAYIDX1]], align 1
; CHECK-NEXT:    [[CMP3:%.*]] = icmp eq i8 [[LD1]], [[LD2]]
; CHECK-NEXT:    br i1 [[CMP3]], label [[LOOP_END_EARLY:%.*]], label [[LOOP_INC]]
; CHECK:       loop.inc:
; CHECK-NEXT:    [[INDEX_NEXT]] = add i64 [[INDEX]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[INDEX_NEXT]], 128
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[LOOP_END]]
; CHECK:       loop.end.early:
; CHECK-NEXT:    [[RET_EARLY:%.*]] = phi i64 [ [[INDEX]], [[SEARCH]] ]
; CHECK-NEXT:    ret i64 [[RET_EARLY]]
; CHECK:       loop.end:
; CHECK-NEXT:    [[RETVAL:%.*]] = phi i64 [ 64, [[LOOP]] ], [ 128, [[LOOP_INC]] ]
; CHECK-NEXT:    ret i64 [[RETVAL]]
;
entry:
  %p1 = alloca [1024 x i8]
  %p2 = alloca [1024 x i8]
  call void @init_mem(ptr %p1, i64 1024)
  call void @init_mem(ptr %p2, i64 1024)
  br label %loop

loop:
  %index = phi i64 [ %index.next, %loop.inc ], [ 3, %entry ]
  %cmp1 = icmp ne i64 %index, 64
  br i1 %cmp1, label %search, label %loop.end

search:
  %arrayidx = getelementptr inbounds i8, ptr %p1, i64 %index
  %ld1 = load i8, ptr %arrayidx, align 1
  %arrayidx1 = getelementptr inbounds i8, ptr %p2, i64 %index
  %ld2 = load i8, ptr %arrayidx1, align 1
  %cmp3 = icmp eq i8 %ld1, %ld2
  br i1 %cmp3, label %loop.end.early, label %loop.inc

loop.inc:
  %index.next = add i64 %index, 1
  %exitcond = icmp ne i64 %index.next, 128
  br i1 %exitcond, label %loop, label %loop.end

loop.end.early:
  %ret.early = phi i64 [ %index, %search ]
  ret i64 %ret.early

loop.end:
  %retval = phi i64 [ 64, %loop ], [ 128, %loop.inc ]
  ret i64 %retval
}