llvm/test/Transforms/CorrelatedValuePropagation/loop.ll

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

define i64 @test_self_loop(i64 %x, i1 %cond) {
; CHECK-LABEL: define range(i64 0, 576460752303423488) i64 @test_self_loop(
; CHECK-SAME: i64 [[X:%.*]], i1 [[COND:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[COND1:%.*]] = icmp ugt i64 [[X]], 576460752303423487
; CHECK-NEXT:    br i1 [[COND1]], label %[[COMMON_RET:.*]], label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    br i1 [[COND]], label %[[INDIRECT:.*]], label %[[LOOP]]
; CHECK:       [[INDIRECT]]:
; CHECK-NEXT:    [[COND2:%.*]] = icmp eq i64 [[X]], 0
; CHECK-NEXT:    br i1 [[COND2]], label %[[COMMON_RET]], label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    br label %[[COMMON_RET]]
; CHECK:       [[COMMON_RET]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[X]], %[[EXIT]] ], [ 0, %[[INDIRECT]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  %cond1 = icmp ugt i64 %x, 576460752303423487
  br i1 %cond1, label %common.ret, label %loop

loop:
  br i1 %cond, label %indirect, label %loop

indirect:
  %cond2 = icmp eq i64 %x, 0
  br i1 %cond2, label %common.ret, label %exit

exit:
  %smax = tail call i64 @llvm.smax.i64(i64 %x, i64 1)
  br label %common.ret

common.ret:
  %res = phi i64 [ %smax, %exit ], [ 0, %indirect ], [ 0, %entry ]
  ret i64 %res
}