llvm-project/llvm/test/Transforms/LoopVectorize/reverse-induction-gep-nowrap-flags.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -S %s | FileCheck %s

define i32 @preserve_inbounds(i64 %start, ptr %ptr) {
; CHECK-LABEL: define i32 @preserve_inbounds(
; CHECK-SAME: i64 [[START:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = sub i64 [[START]], [[INDEX]]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[PTR]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[TMP2]], i32 -3
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP3]], align 4
; CHECK-NEXT:    [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT:    [[TMP4]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT:    br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP6:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[TMP4]])
; CHECK-NEXT:    br label %[[END:.*]]
; CHECK:       [[END]]:
; CHECK-NEXT:    ret i32 [[TMP6]]
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %rev.ind = phi i64 [ %start, %entry ], [ %rev.ind.next, %loop ]
  %redux = phi i32 [ 0, %entry ], [ %redux.next, %loop ]
  %rev.ind.next = add i64 %rev.ind, -1
  %gep.ptr.ind = getelementptr inbounds i32, ptr %ptr, i64 %rev.ind.next
  %ld.ptr = load i32, ptr %gep.ptr.ind, align 4
  %redux.next = add i32 %ld.ptr, %redux
  %iv.next = add i32 %iv, 1
  %exit.cond = icmp ne i32 %iv.next, 1024
  br i1 %exit.cond, label %loop, label %end

end:
  ret i32 %redux.next
}

define i32 @preserve_nusw(i64 %start, ptr %ptr) {
; CHECK-LABEL: define i32 @preserve_nusw(
; CHECK-SAME: i64 [[START:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = sub i64 [[START]], [[INDEX]]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr nusw i32, ptr [[PTR]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr nusw i32, ptr [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr nusw i32, ptr [[TMP2]], i32 -3
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP3]], align 4
; CHECK-NEXT:    [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT:    [[TMP4]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT:    br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP6:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[TMP4]])
; CHECK-NEXT:    br label %[[END:.*]]
; CHECK:       [[END]]:
; CHECK-NEXT:    ret i32 [[TMP6]]
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %rev.ind = phi i64 [ %start, %entry ], [ %rev.ind.next, %loop ]
  %redux = phi i32 [ 0, %entry ], [ %redux.next, %loop ]
  %rev.ind.next = add i64 %rev.ind, -1
  %gep.ptr.ind = getelementptr nusw i32, ptr %ptr, i64 %rev.ind.next
  %ld.ptr = load i32, ptr %gep.ptr.ind, align 4
  %redux.next = add i32 %ld.ptr, %redux
  %iv.next = add i32 %iv, 1
  %exit.cond = icmp ne i32 %iv.next, 1024
  br i1 %exit.cond, label %loop, label %end

end:
  ret i32 %redux.next
}

define i32 @drop_nuw(i64 %start, ptr %ptr) {
; CHECK-LABEL: define i32 @drop_nuw(
; CHECK-SAME: i64 [[START:%.*]], ptr [[PTR:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP4:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[OFFSET_IDX:%.*]] = sub i64 [[START]], [[INDEX]]
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr nuw i32, ptr [[PTR]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr i32, ptr [[TMP1]], i32 0
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr i32, ptr [[TMP2]], i32 -3
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP3]], align 4
; CHECK-NEXT:    [[REVERSE:%.*]] = shufflevector <4 x i32> [[WIDE_LOAD]], <4 x i32> poison, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
; CHECK-NEXT:    [[TMP4]] = add <4 x i32> [[REVERSE]], [[VEC_PHI]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT:    br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP6:%.*]] = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> [[TMP4]])
; CHECK-NEXT:    br label %[[END:.*]]
; CHECK:       [[END]]:
; CHECK-NEXT:    ret i32 [[TMP6]]
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %rev.ind = phi i64 [ %start, %entry ], [ %rev.ind.next, %loop ]
  %redux = phi i32 [ 0, %entry ], [ %redux.next, %loop ]
  %rev.ind.next = add i64 %rev.ind, -1
  %gep.ptr.ind = getelementptr nuw i32, ptr %ptr, i64 %rev.ind.next
  %ld.ptr = load i32, ptr %gep.ptr.ind, align 4
  %redux.next = add i32 %ld.ptr, %redux
  %iv.next = add i32 %iv, 1
  %exit.cond = icmp ne i32 %iv.next, 1024
  br i1 %exit.cond, label %loop, label %end

end:
  ret i32 %redux.next
}