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llvm/llvm/test/Transforms/ConstraintElimination/monotonic-int-phis-multiples.ll 

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt -S -passes=constraint-elimination < %s | FileCheck %s

define void @multiple_pow2(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = shl i64 [[COUNT]], 2
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    br i1 true, label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = shl i64 %count, 2
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_pow2_larger_than_needed(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2_larger_than_needed(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = shl i64 [[COUNT]], 3
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    br i1 true, label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = shl i64 %count, 3
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_pow2_too_small(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2_too_small(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = shl i64 [[COUNT]], 1
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[CMP2_I_I:%.*]] = icmp ult i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP2_I_I]], label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = shl i64 %count, 1
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_pow2_start_offset(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2_start_offset(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = shl i64 [[COUNT]], 2
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp ugt i64 [[END]], 4
; CHECK-NEXT:    br i1 [[PRECOND]], label [[LOOP:%.*]], label [[EXIT:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 4, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    br i1 true, label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = shl i64 %count, 2
  %precond = icmp ugt i64 %end, 4
  br i1 %precond, label %loop, label %exit

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 4, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_pow2_wrong_start_offset(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2_wrong_start_offset(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = shl i64 [[COUNT]], 2
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp ugt i64 [[END]], 1
; CHECK-NEXT:    br i1 [[PRECOND]], label [[LOOP:%.*]], label [[EXIT:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[CMP2_I_I:%.*]] = icmp ult i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP2_I_I]], label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = shl i64 %count, 2
  %precond = icmp ugt i64 %end, 1
  br i1 %precond, label %loop, label %exit

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 1, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_pow2_start_offset_dynamic(i64 %count) {
; CHECK-LABEL: define void @multiple_pow2_start_offset_dynamic(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SHL:%.*]] = shl i64 [[COUNT]], 2
; CHECK-NEXT:    [[END:%.*]] = add i64 [[SHL]], 1
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp ne i64 [[END]], 0
; CHECK-NEXT:    br i1 [[PRECOND]], label [[LOOP:%.*]], label [[EXIT:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 1, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 4
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    br i1 true, label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %shl = shl i64 %count, 2
  %end = add i64 %shl, 1
  %precond = icmp ne i64 %end, 0
  br i1 %precond, label %loop, label %exit

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 1, %entry ]
  %iv.next = add i64 %iv, 4
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_non_pow2_nuw(i64 %count) {
; CHECK-LABEL: define void @multiple_non_pow2_nuw(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = mul nuw i64 [[COUNT]], 3
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 3
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    br i1 true, label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = mul nuw i64 %count, 3
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %entry ]
  %iv.next = add i64 %iv, 3
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}

define void @multiple_non_pow2_missing_nuw(i64 %count) {
; CHECK-LABEL: define void @multiple_non_pow2_missing_nuw(
; CHECK-SAME: i64 [[COUNT:%.*]]) {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[END:%.*]] = mul i64 [[COUNT]], 3
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 3
; CHECK-NEXT:    [[CMP_I_NOT:%.*]] = icmp eq i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP_I_NOT]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[CMP2_I_I:%.*]] = icmp ult i64 [[IV]], [[END]]
; CHECK-NEXT:    br i1 [[CMP2_I_I]], label [[LOOP]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %end = mul i64 %count, 3
  br label %loop

loop:
  %iv = phi i64 [ %iv.next, %loop.latch ], [ 0, %entry ]
  %iv.next = add i64 %iv, 3
  %cmp.i.not = icmp eq i64 %iv, %end
  br i1 %cmp.i.not, label %exit, label %loop.latch

loop.latch:
  %cmp2.i.i = icmp ult i64 %iv, %end
  br i1 %cmp2.i.i, label %loop, label %exit

exit:
  ret void
}