llvm/test/Transforms/IndVarSimplify/loop-guard-order.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -p indvars -S %s | FileCheck %s

declare void @foo()

define void @narrow_iv_precondition_order_1(ptr %start, i32 %base, i8 %n) {
; CHECK-LABEL: define void @narrow_iv_precondition_order_1(
; CHECK-SAME: ptr [[START:%.*]], i32 [[BASE:%.*]], i8 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[PRE_0:%.*]] = icmp sgt i32 [[BASE]], 0
; CHECK-NEXT:    br i1 [[PRE_0]], label %[[EXIT:.*]], label %[[PH:.*]]
; CHECK:       [[PH]]:
; CHECK-NEXT:    [[N_EXT:%.*]] = zext i8 [[N]] to i32
; CHECK-NEXT:    [[PRE_1:%.*]] = icmp sgt i32 [[BASE]], [[N_EXT]]
; CHECK-NEXT:    br i1 [[PRE_1]], label %[[LOOP_PREHEADER:.*]], label %[[EXIT]]
; CHECK:       [[LOOP_PREHEADER]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi ptr [ [[GEP:%.*]], %[[LOOP]] ], [ [[START]], %[[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    [[END:%.*]] = load i8, ptr [[IV]], align 1
; CHECK-NEXT:    [[END_EXT:%.*]] = zext i8 [[END]] to i32
; CHECK-NEXT:    [[GEP]] = getelementptr inbounds i8, ptr [[IV]], i64 1
; CHECK-NEXT:    [[EC:%.*]] = icmp sgt i32 [[BASE]], [[END_EXT]]
; CHECK-NEXT:    br i1 [[EC]], label %[[LOOP]], label %[[EXIT_LOOPEXIT:.*]]
; CHECK:       [[EXIT_LOOPEXIT]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %pre.0 = icmp sgt i32 %base, 0
  br i1 %pre.0, label %exit, label %ph

ph:                          ; preds = %entry
  %n.ext = zext i8 %n to i32
  %pre.1 = icmp sgt i32 %base, %n.ext
  br i1 %pre.1, label %loop, label %exit

loop:
  %iv = phi ptr [ %start, %ph ], [ %gep, %loop ]
  call void @foo()
  %end = load i8, ptr %iv, align 1
  %end.ext = zext i8 %end to i32
  %gep = getelementptr inbounds i8, ptr %iv, i64 1
  %ec = icmp sgt i32 %base, %end.ext
  br i1 %ec, label %loop, label %exit

exit:
  ret void
}

define void @narrow_iv_precondition_order_2(ptr %start, i32 %base, i8 %n) {
; CHECK-LABEL: define void @narrow_iv_precondition_order_2(
; CHECK-SAME: ptr [[START:%.*]], i32 [[BASE:%.*]], i8 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[N_EXT:%.*]] = zext i8 [[N]] to i32
; CHECK-NEXT:    [[PRE_1:%.*]] = icmp sgt i32 [[BASE]], [[N_EXT]]
; CHECK-NEXT:    br i1 [[PRE_1]], label %[[EXIT:.*]], label %[[PH:.*]]
; CHECK:       [[PH]]:
; CHECK-NEXT:    [[PRE_0:%.*]] = icmp sgt i32 [[BASE]], 0
; CHECK-NEXT:    br i1 [[PRE_0]], label %[[LOOP_PREHEADER:.*]], label %[[EXIT]]
; CHECK:       [[LOOP_PREHEADER]]:
; CHECK-NEXT:    [[TMP0:%.*]] = trunc i32 [[BASE]] to i8
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi ptr [ [[GEP:%.*]], %[[LOOP]] ], [ [[START]], %[[LOOP_PREHEADER]] ]
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    [[END:%.*]] = load i8, ptr [[IV]], align 1
; CHECK-NEXT:    [[GEP]] = getelementptr inbounds i8, ptr [[IV]], i64 1
; CHECK-NEXT:    [[EC:%.*]] = icmp ugt i8 [[TMP0]], [[END]]
; CHECK-NEXT:    br i1 [[EC]], label %[[LOOP]], label %[[EXIT_LOOPEXIT:.*]]
; CHECK:       [[EXIT_LOOPEXIT]]:
; CHECK-NEXT:    br label %[[EXIT]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %n.ext = zext i8 %n to i32
  %pre.1 = icmp sgt i32 %base, %n.ext
  br i1 %pre.1, label %exit, label %ph

ph:                          ; preds = %entry
  %pre.0 = icmp sgt i32 %base, 0
  br i1 %pre.0, label %loop, label %exit

loop:
  %iv = phi ptr [ %start, %ph ], [ %gep, %loop ]
  call void @foo()
  %end = load i8, ptr %iv, align 1
  %end.ext = zext i8 %end to i32
  %gep = getelementptr inbounds i8, ptr %iv, i64 1
  %ec = icmp sgt i32 %base, %end.ext
  br i1 %ec, label %loop, label %exit

exit:
  ret void
}