llvm/test/Transforms/LoopInterchange/reduction2mem-extra-lcssa.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
; Non-reduction LCSSA PHIs in the inner-loop exit must still be validated
; even when a reduction LCSSA PHI is present. Used to crash.
;
; RUN: opt < %s -passes=loop-interchange -loop-interchange-reduction-to-mem \
; RUN:   -pass-remarks-missed=loop-interchange -pass-remarks-output=%t -S \
; RUN:   | FileCheck -check-prefix=IR %s
; RUN: FileCheck --input-file=%t %s

; CHECK: --- !Missed
; CHECK-NEXT: Pass:            loop-interchange
; CHECK-NEXT: Name:            UnsupportedExitPHI
; CHECK-NEXT: Function:        reduction_lcssa_with_non_phi_user
; CHECK-NEXT: Args:
; CHECK-NEXT:   - String:          Found unsupported PHI node in loop exit.

@A = common global [100 x [100 x i32]] zeroinitializer
@sum = common global [100 x i32] zeroinitializer

define void @reduction_lcssa_with_non_phi_user() {
; IR-LABEL: define void @reduction_lcssa_with_non_phi_user() {
; IR-NEXT:  [[ENTRY:.*]]:
; IR-NEXT:    br label %[[OUTER_HEADER:.*]]
; IR:       [[OUTER_HEADER]]:
; IR-NEXT:    [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[OUTER_LATCH:.*]] ]
; IR-NEXT:    [[SUM_PTR:%.*]] = getelementptr inbounds i32, ptr @sum, i64 [[I]]
; IR-NEXT:    br label %[[INNER:.*]]
; IR:       [[INNER]]:
; IR-NEXT:    [[J:%.*]] = phi i64 [ 0, %[[OUTER_HEADER]] ], [ [[J_NEXT:%.*]], %[[INNER]] ]
; IR-NEXT:    [[RED:%.*]] = phi i32 [ 0, %[[OUTER_HEADER]] ], [ [[ADD:%.*]], %[[INNER]] ]
; IR-NEXT:    [[PTR:%.*]] = getelementptr inbounds [100 x i32], ptr @A, i64 [[J]], i64 [[I]]
; IR-NEXT:    [[VAL:%.*]] = load i32, ptr [[PTR]], align 4
; IR-NEXT:    [[ADD]] = add i32 [[RED]], [[VAL]]
; IR-NEXT:    [[J_NEXT]] = add nuw nsw i64 [[J]], 1
; IR-NEXT:    [[EXITCOND_INNER:%.*]] = icmp eq i64 [[J]], 99
; IR-NEXT:    br i1 [[EXITCOND_INNER]], label %[[INNER_EXIT:.*]], label %[[INNER]]
; IR:       [[INNER_EXIT]]:
; IR-NEXT:    [[RED_LCSSA:%.*]] = phi i32 [ [[ADD]], %[[INNER]] ]
; IR-NEXT:    [[J_LCSSA:%.*]] = phi i64 [ [[J]], %[[INNER]] ]
; IR-NEXT:    store i32 [[RED_LCSSA]], ptr [[SUM_PTR]], align 4
; IR-NEXT:    [[USE_J:%.*]] = add i64 [[J_LCSSA]], 1
; IR-NEXT:    br label %[[OUTER_LATCH]]
; IR:       [[OUTER_LATCH]]:
; IR-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; IR-NEXT:    [[EXITCOND_OUTER:%.*]] = icmp eq i64 [[I]], 99
; IR-NEXT:    br i1 [[EXITCOND_OUTER]], label %[[EXIT:.*]], label %[[OUTER_HEADER]]
; IR:       [[EXIT]]:
; IR-NEXT:    ret void
;
entry:
  br label %outer.header

outer.header:
  %i = phi i64 [ 0, %entry ], [ %i.next, %outer.latch ]
  %sum.ptr = getelementptr inbounds i32, ptr @sum, i64 %i
  br label %inner

inner:
  %j = phi i64 [ 0, %outer.header ], [ %j.next, %inner ]
  %red = phi i32 [ 0, %outer.header ], [ %add, %inner ]
  %ptr = getelementptr inbounds [100 x i32], ptr @A, i64 %j, i64 %i
  %val = load i32, ptr %ptr
  %add = add i32 %red, %val
  %j.next = add nuw nsw i64 %j, 1
  %exitcond.inner = icmp eq i64 %j, 99
  br i1 %exitcond.inner, label %inner.exit, label %inner

inner.exit:
  %red.lcssa = phi i32 [ %add, %inner ]
  %j.lcssa = phi i64 [ %j, %inner ]
  store i32 %red.lcssa, ptr %sum.ptr
  %use.j = add i64 %j.lcssa, 1
  br label %outer.latch

outer.latch:
  %i.next = add nuw nsw i64 %i, 1
  %exitcond.outer = icmp eq i64 %i, 99
  br i1 %exitcond.outer, label %exit, label %outer.header

exit:
  ret void
}