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llvm/llvm/test/Transforms/LICM/promote-capture.ll 

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes='loop-mssa(licm)' < %s | FileCheck %s

declare i1 @cond(i32 %v) readnone
declare void @capture(ptr %p) readnone

define void @test_captured_after_loop(i32 %len) {
; CHECK-LABEL: @test_captured_after_loop(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[COUNT:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 0, ptr [[COUNT]], align 4
; CHECK-NEXT:    [[COUNT_PROMOTED:%.*]] = load i32, ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[C_INC2:%.*]] = phi i32 [ [[COUNT_PROMOTED]], [[ENTRY:%.*]] ], [ [[C_INC1:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[COND:%.*]] = call i1 @cond(i32 [[I]])
; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[LATCH]]
; CHECK:       if:
; CHECK-NEXT:    [[C_INC:%.*]] = add i32 [[C_INC2]], 1
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[C_INC1]] = phi i32 [ [[C_INC]], [[IF]] ], [ [[C_INC2]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[I_NEXT]], [[LEN:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    [[C_INC1_LCSSA:%.*]] = phi i32 [ [[C_INC1]], [[LATCH]] ]
; CHECK-NEXT:    store i32 [[C_INC1_LCSSA]], ptr [[COUNT]], align 4
; CHECK-NEXT:    call void @capture(ptr [[COUNT]])
; CHECK-NEXT:    ret void
;
entry:
  %count = alloca i32
  store i32 0, ptr %count
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %latch ]
  %cond = call i1 @cond(i32 %i)
  br i1 %cond, label %if, label %latch

if:
  %c = load i32, ptr %count
  %c.inc = add i32 %c, 1
  store i32 %c.inc, ptr %count
  br label %latch

latch:
  %i.next = add nuw i32 %i, 1
  %cmp = icmp eq i32 %i.next, %len
  br i1 %cmp, label %exit, label %loop

exit:
  call void @capture(ptr %count)
  ret void
}

define void @test_captured_in_loop(i32 %len) {
; CHECK-LABEL: @test_captured_in_loop(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[COUNT:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 0, ptr [[COUNT]], align 4
; CHECK-NEXT:    [[COUNT_PROMOTED:%.*]] = load i32, ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[C_INC2:%.*]] = phi i32 [ [[COUNT_PROMOTED]], [[ENTRY:%.*]] ], [ [[C_INC1:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[COND:%.*]] = call i1 @cond(i32 [[I]])
; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[LATCH]]
; CHECK:       if:
; CHECK-NEXT:    [[C_INC:%.*]] = add i32 [[C_INC2]], 1
; CHECK-NEXT:    store i32 [[C_INC]], ptr [[COUNT]], align 4
; CHECK-NEXT:    call void @capture(ptr [[COUNT]])
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[C_INC1]] = phi i32 [ [[C_INC]], [[IF]] ], [ [[C_INC2]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[I_NEXT]], [[LEN:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %count = alloca i32
  store i32 0, ptr %count
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %latch ]
  %cond = call i1 @cond(i32 %i)
  br i1 %cond, label %if, label %latch

if:
  %c = load i32, ptr %count
  %c.inc = add i32 %c, 1
  store i32 %c.inc, ptr %count
  call void @capture(ptr %count)
  br label %latch

latch:
  %i.next = add nuw i32 %i, 1
  %cmp = icmp eq i32 %i.next, %len
  br i1 %cmp, label %exit, label %loop

exit:
  ret void
}

define void @test_captured_before_loop(i32 %len) {
; CHECK-LABEL: @test_captured_before_loop(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[COUNT:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 0, ptr [[COUNT]], align 4
; CHECK-NEXT:    call void @capture(ptr [[COUNT]])
; CHECK-NEXT:    [[COUNT_PROMOTED:%.*]] = load i32, ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[C_INC2:%.*]] = phi i32 [ [[COUNT_PROMOTED]], [[ENTRY:%.*]] ], [ [[C_INC1:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[COND:%.*]] = call i1 @cond(i32 [[I]])
; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[LATCH]]
; CHECK:       if:
; CHECK-NEXT:    [[C_INC:%.*]] = add i32 [[C_INC2]], 1
; CHECK-NEXT:    store i32 [[C_INC]], ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[C_INC1]] = phi i32 [ [[C_INC]], [[IF]] ], [ [[C_INC2]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[I_NEXT]], [[LEN:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %count = alloca i32
  store i32 0, ptr %count
  call void @capture(ptr %count)
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %latch ]
  %cond = call i1 @cond(i32 %i)
  br i1 %cond, label %if, label %latch

if:
  %c = load i32, ptr %count
  %c.inc = add i32 %c, 1
  store i32 %c.inc, ptr %count
  br label %latch

latch:
  %i.next = add nuw i32 %i, 1
  %cmp = icmp eq i32 %i.next, %len
  br i1 %cmp, label %exit, label %loop

exit:
  ret void
}

; Should not get promoted, because the pointer is captured and may not
; be thread-local.
define void @test_captured_before_loop_byval(ptr byval(i32) align 4 %count, i32 %len) {
; CHECK-LABEL: @test_captured_before_loop_byval(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 0, ptr [[COUNT:%.*]], align 4
; CHECK-NEXT:    call void @capture(ptr [[COUNT]])
; CHECK-NEXT:    [[COUNT_PROMOTED:%.*]] = load i32, ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[C_INC2:%.*]] = phi i32 [ [[COUNT_PROMOTED]], [[ENTRY:%.*]] ], [ [[C_INC1:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[COND:%.*]] = call i1 @cond(i32 [[I]])
; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[LATCH]]
; CHECK:       if:
; CHECK-NEXT:    [[C_INC:%.*]] = add i32 [[C_INC2]], 1
; CHECK-NEXT:    store i32 [[C_INC]], ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[C_INC1]] = phi i32 [ [[C_INC]], [[IF]] ], [ [[C_INC2]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[I_NEXT]], [[LEN:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  store i32 0, ptr %count
  call void @capture(ptr %count)
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %latch ]
  %cond = call i1 @cond(i32 %i)
  br i1 %cond, label %if, label %latch

if:
  %c = load i32, ptr %count
  %c.inc = add i32 %c, 1
  store i32 %c.inc, ptr %count
  br label %latch

latch:
  %i.next = add nuw i32 %i, 1
  %cmp = icmp eq i32 %i.next, %len
  br i1 %cmp, label %exit, label %loop

exit:
  ret void
}

define void @test_captured_after_loop_byval(ptr byval(i32) align 4 %count, i32 %len) {
; CHECK-LABEL: @test_captured_after_loop_byval(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i32 0, ptr [[COUNT:%.*]], align 4
; CHECK-NEXT:    [[COUNT_PROMOTED:%.*]] = load i32, ptr [[COUNT]], align 4
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[C_INC2:%.*]] = phi i32 [ [[COUNT_PROMOTED]], [[ENTRY:%.*]] ], [ [[C_INC1:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT:    [[I:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[I_NEXT:%.*]], [[LATCH]] ]
; CHECK-NEXT:    [[COND:%.*]] = call i1 @cond(i32 [[I]])
; CHECK-NEXT:    br i1 [[COND]], label [[IF:%.*]], label [[LATCH]]
; CHECK:       if:
; CHECK-NEXT:    [[C_INC:%.*]] = add i32 [[C_INC2]], 1
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[C_INC1]] = phi i32 [ [[C_INC]], [[IF]] ], [ [[C_INC2]], [[LOOP]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i32 [[I]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[I_NEXT]], [[LEN:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    [[C_INC1_LCSSA:%.*]] = phi i32 [ [[C_INC1]], [[LATCH]] ]
; CHECK-NEXT:    store i32 [[C_INC1_LCSSA]], ptr [[COUNT]], align 4
; CHECK-NEXT:    call void @capture(ptr [[COUNT]])
; CHECK-NEXT:    ret void
;
entry:
  store i32 0, ptr %count
  br label %loop

loop:
  %i = phi i32 [ 0, %entry ], [ %i.next, %latch ]
  %cond = call i1 @cond(i32 %i)
  br i1 %cond, label %if, label %latch

if:
  %c = load i32, ptr %count
  %c.inc = add i32 %c, 1
  store i32 %c.inc, ptr %count
  br label %latch

latch:
  %i.next = add nuw i32 %i, 1
  %cmp = icmp eq i32 %i.next, %len
  br i1 %cmp, label %exit, label %loop

exit:
  call void @capture(ptr %count)
  ret void
}