llvm/test/Transforms/LoopInterchange/update-condbranch-duplicate-successors.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes=loop-interchange -cache-line-size=64 -S %s | FileCheck %s


@global = external dso_local global [1000 x [1000 x i32]], align 16

; Test that we support updating conditional branches where both targets are the same
; in the predecessor of the outer loop header.

define void @foo(i1 %cmp) {
; CHECK-LABEL: define void @foo(
; CHECK-SAME: i1 [[CMP:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[INNER_HEADER_PREHEADER:.*]], label %[[INNER_HEADER_PREHEADER]]
; CHECK:       [[BB1:.*]]:
; CHECK-NEXT:    br label %[[OUTER_HEADER:.*]]
; CHECK:       [[OUTER_HEADER]]:
; CHECK-NEXT:    [[OUTER_IV:%.*]] = phi i64 [ 0, %[[BB1]] ], [ [[OUTER_IV_NEXT:%.*]], %[[OUTER_LATCH:.*]] ]
; CHECK-NEXT:    br label %[[INNER_HEADER_SPLIT1:.*]]
; CHECK:       [[INNER_HEADER_PREHEADER]]:
; CHECK-NEXT:    br label %[[INNER_HEADER:.*]]
; CHECK:       [[INNER_HEADER]]:
; CHECK-NEXT:    [[INNER_IV:%.*]] = phi i64 [ [[TMP0:%.*]], %[[INNER_HEADER_SPLIT:.*]] ], [ 5, %[[INNER_HEADER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[BB1]]
; CHECK:       [[INNER_HEADER_SPLIT1]]:
; CHECK-NEXT:    [[PTR:%.*]] = getelementptr inbounds [1000 x [1000 x i32]], ptr @global, i64 0, i64 [[INNER_IV]], i64 [[OUTER_IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, ptr [[PTR]], align 4
; CHECK-NEXT:    [[V:%.*]] = mul i32 [[LV]], 100
; CHECK-NEXT:    store i32 [[V]], ptr [[PTR]], align 4
; CHECK-NEXT:    [[INNER_IV_NEXT:%.*]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT:    [[COND1:%.*]] = icmp eq i64 [[INNER_IV_NEXT]], 1000
; CHECK-NEXT:    br label %[[OUTER_LATCH]]
; CHECK:       [[INNER_HEADER_SPLIT]]:
; CHECK-NEXT:    [[TMP0]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[TMP0]], 1000
; CHECK-NEXT:    br i1 [[TMP1]], label %[[BB9:.*]], label %[[INNER_HEADER]]
; CHECK:       [[OUTER_LATCH]]:
; CHECK-NEXT:    [[OUTER_IV_NEXT]] = add nuw nsw i64 [[OUTER_IV]], 1
; CHECK-NEXT:    [[COND2:%.*]] = icmp eq i64 [[OUTER_IV_NEXT]], 1000
; CHECK-NEXT:    br i1 [[COND2]], label %[[INNER_HEADER_SPLIT]], label %[[OUTER_HEADER]]
; CHECK:       [[BB9]]:
; CHECK-NEXT:    br label %[[BB10:.*]]
; CHECK:       [[BB10]]:
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cmp, label %outer.ph, label %outer.ph

outer.ph:
  br label %outer.header

outer.header:
  %outer.iv = phi i64 [ 0, %outer.ph], [ %outer.iv.next, %outer.latch ]
  br label %inner.header

inner.header:
  %inner.iv = phi i64 [ %inner.iv.next, %inner.header ], [ 5, %outer.header ]
  %ptr = getelementptr inbounds [1000 x [1000 x i32]], ptr @global, i64 0, i64 %inner.iv, i64 %outer.iv
  %lv = load i32, ptr %ptr
  %v = mul i32 %lv, 100
  store i32 %v, ptr %ptr
  %inner.iv.next = add nsw i64 %inner.iv, 1
  %cond1 = icmp eq i64 %inner.iv.next , 1000
  br i1 %cond1, label %outer.latch, label %inner.header

outer.latch:
  %outer.iv.next = add nuw nsw i64 %outer.iv, 1
  %cond2 = icmp eq i64 %outer.iv.next, 1000
  br i1 %cond2, label %outer.exit, label %outer.header

outer.exit:
  br label %exit

exit:
  ret void
}


define void @foo1(i1 %cmp) {
; CHECK-LABEL: define void @foo1(
; CHECK-SAME: i1 [[CMP:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 [[CMP]], label %[[BB1:.*]], label %[[BB1]]
; CHECK:       [[BB1]]:
; CHECK-NEXT:    br i1 [[CMP]], label %[[INNER_HEADER_PREHEADER:.*]], label %[[INNER_HEADER_PREHEADER]]
; CHECK:       [[OUTER_HEADER_PREHEADER:.*]]:
; CHECK-NEXT:    br label %[[OUTER_HEADER:.*]]
; CHECK:       [[OUTER_HEADER]]:
; CHECK-NEXT:    [[OUTER_IV:%.*]] = phi i64 [ [[OUTER_IV_NEXT:%.*]], %[[OUTER_LATCH:.*]] ], [ 0, %[[OUTER_HEADER_PREHEADER]] ]
; CHECK-NEXT:    br i1 [[CMP]], label %[[INNER_HEADER_SPLIT1:.*]], label %[[INNER_HEADER_SPLIT1]]
; CHECK:       [[INNER_HEADER_PREHEADER]]:
; CHECK-NEXT:    br label %[[INNER_HEADER:.*]]
; CHECK:       [[INNER_HEADER]]:
; CHECK-NEXT:    [[INNER_IV:%.*]] = phi i64 [ [[TMP0:%.*]], %[[INNER_HEADER_SPLIT:.*]] ], [ 5, %[[INNER_HEADER_PREHEADER]] ]
; CHECK-NEXT:    br label %[[OUTER_HEADER_PREHEADER]]
; CHECK:       [[INNER_HEADER_SPLIT1]]:
; CHECK-NEXT:    [[PTR:%.*]] = getelementptr inbounds [1000 x [1000 x i32]], ptr @global, i64 0, i64 [[INNER_IV]], i64 [[OUTER_IV]]
; CHECK-NEXT:    [[LV:%.*]] = load i32, ptr [[PTR]], align 4
; CHECK-NEXT:    [[V:%.*]] = mul i32 [[LV]], 100
; CHECK-NEXT:    store i32 [[V]], ptr [[PTR]], align 4
; CHECK-NEXT:    [[INNER_IV_NEXT:%.*]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT:    [[COND1:%.*]] = icmp eq i64 [[INNER_IV_NEXT]], 1000
; CHECK-NEXT:    br label %[[OUTER_LATCH]]
; CHECK:       [[INNER_HEADER_SPLIT]]:
; CHECK-NEXT:    [[TMP0]] = add nsw i64 [[INNER_IV]], 1
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[TMP0]], 1000
; CHECK-NEXT:    br i1 [[TMP1]], label %[[BB9:.*]], label %[[INNER_HEADER]]
; CHECK:       [[OUTER_LATCH]]:
; CHECK-NEXT:    [[OUTER_IV_NEXT]] = add nuw nsw i64 [[OUTER_IV]], 1
; CHECK-NEXT:    [[COND2:%.*]] = icmp eq i64 [[OUTER_IV_NEXT]], 1000
; CHECK-NEXT:    br i1 [[COND2]], label %[[INNER_HEADER_SPLIT]], label %[[OUTER_HEADER]]
; CHECK:       [[BB9]]:
; CHECK-NEXT:    br label %[[BB10:.*]]
; CHECK:       [[BB10]]:
; CHECK-NEXT:    ret void
;
entry:
  br i1 %cmp, label %outer.ph, label %outer.ph

outer.ph:
  br i1 %cmp, label %outer.header, label %outer.header

outer.header:
  %outer.iv = phi i64 [ 0, %outer.ph ], [ 0, %outer.ph ], [ %outer.iv.next, %outer.latch ]
  br i1 %cmp, label %inner.header, label %inner.header

inner.header:
  %inner.iv = phi i64 [ %inner.iv.next, %inner.header ], [ 5, %outer.header ], [ 5, %outer.header ]
  %ptr = getelementptr inbounds [1000 x [1000 x i32]], ptr @global, i64 0, i64 %inner.iv, i64 %outer.iv
  %lv = load i32, ptr %ptr
  %v = mul i32 %lv, 100
  store i32 %v, ptr %ptr
  %inner.iv.next = add nsw i64 %inner.iv, 1
  %cond1 = icmp eq i64 %inner.iv.next , 1000
  br i1 %cond1, label %outer.latch, label %inner.header

outer.latch:
  %outer.iv.next = add nuw nsw i64 %outer.iv, 1
  %cond2 = icmp eq i64 %outer.iv.next, 1000
  br i1 %cond2, label %outer.exit, label %outer.header

outer.exit:
  br label %exit

exit:
  ret void
}