llvm/test/Transforms/IndVarSimplify/rewrite-loop-exit-values-phi.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=indvars -S %s -o - | FileCheck %s

; When bailing out in rewriteLoopExitValues() you would be left with a PHI node
; that was not deleted, and the IndVar pass would return an incorrect modified
; status. This was caught by the expensive check introduced in D86589.

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

define void @hoge(i64 %x, i64 %idx.start, ptr %ptr) {
; CHECK-LABEL: @hoge(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[N:%.*]] = sdiv exact i64 [[X:%.*]], 40
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[IDX_START:%.*]], 1
; CHECK-NEXT:    [[TMP1:%.*]] = sub i64 [[TMP0]], [[N]]
; CHECK-NEXT:    br label [[HEADER:%.*]]
; CHECK:       header:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LATCH:%.*]] ], [ [[TMP1]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IDX:%.*]] = phi i64 [ [[IDX_NEXT:%.*]], [[LATCH]] ], [ [[IDX_START]], [[ENTRY]] ]
; CHECK-NEXT:    [[COND:%.*]] = icmp sgt i64 [[N]], [[IDX]]
; CHECK-NEXT:    br i1 [[COND]], label [[END:%.*]], label [[INNER_PREHEADER:%.*]]
; CHECK:       inner.preheader:
; CHECK-NEXT:    br label [[INNER:%.*]]
; CHECK:       inner:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], [[INNER]] ], [ 0, [[INNER_PREHEADER]] ]
; CHECK-NEXT:    [[I_NEXT]] = add nuw i64 [[I]], 1
; CHECK-NEXT:    store i64 0, ptr [[PTR:%.*]], align 8
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[I_NEXT]], [[INDVARS_IV]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[INNER]], label [[INNER_EXIT:%.*]]
; CHECK:       inner_exit:
; CHECK-NEXT:    [[INDVAR:%.*]] = phi i64 [ [[I_NEXT]], [[INNER]] ]
; CHECK-NEXT:    [[INDVAR_USE:%.*]] = add i64 [[INDVAR]], 1
; CHECK-NEXT:    br label [[LATCH]]
; CHECK:       latch:
; CHECK-NEXT:    [[IDX_NEXT]] = add nsw i64 [[IDX]], -1
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br label [[HEADER]]
; CHECK:       end:
; CHECK-NEXT:    ret void
;
entry:                                            ; preds = %entry
  %n = sdiv exact i64 %x, 40
  br label %header

header:                                           ; preds = %latch, %entry
  %idx = phi i64 [ %idx.next, %latch ], [ %idx.start, %entry ]
  %cond = icmp sgt i64 %n, %idx
  br i1 %cond, label %end, label %inner

inner:                                            ; preds = %inner, %header
  %i = phi i64 [ %i.next, %inner ], [ 0, %header ]
  %j = phi i64 [ %j.next, %inner ], [ %n, %header ]
  %i.next = add nsw i64 %i, 1
  %j.next = add nsw i64 %j, 1
  store i64 0, ptr %ptr
  %cond1 = icmp slt i64 %j, %idx
  br i1 %cond1, label %inner, label %inner_exit

inner_exit:                                       ; preds = %inner
  %indvar = phi i64 [ %i.next, %inner ]
  %indvar_use = add i64 %indvar, 1
  br label %latch

latch:                                            ; preds = %inner_exit
  %idx.next = add nsw i64 %idx, -1
  br label %header

end:                                              ; preds = %header
  ret void
}


declare void @foo()

define i64 @narow_canonical_iv_wide_multiplied_iv(i32 %x, i64 %y, ptr %0) {
; CHECK-LABEL: @narow_canonical_iv_wide_multiplied_iv(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SMAX:%.*]] = tail call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 1)
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT:    [[EC:%.*]] = icmp ne i32 [[IV_NEXT]], [[SMAX]]
; CHECK-NEXT:    br i1 [[EC]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[TMP1:%.*]] = zext nneg i32 [[SMAX]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = mul i64 [[Y:%.*]], [[TMP1]]
; CHECK-NEXT:    [[TMP3:%.*]] = shl i64 [[TMP2]], 1
; CHECK-NEXT:    [[TMP6:%.*]] = add nuw nsw i64 [[TMP3]], 1
; CHECK-NEXT:    ret i64 [[TMP6]]
;
entry:
  %smax = tail call i32 @llvm.smax.i32(i32 %x, i32 1)
  %mul.y = shl i64 %y, 1
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %iv.mul = phi i64 [ 1, %entry ], [ %iv.mul.next, %loop ]
  %iv.mul.next = add i64 %iv.mul, %mul.y
  call void @foo()
  %iv.next = add i32 %iv, 1
  %ec = icmp ult i32 %iv.next, %smax
  br i1 %ec, label %loop, label %exit

exit:
  ret i64 %iv.mul.next
}

declare i32 @llvm.smax.i32(i32, i32)