llvm/test/Transforms/LoopVectorize/make-scalarization-decisions.ll

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

define void @preserve_trunc_flags(ptr %p) {
; CHECK-LABEL: define void @preserve_trunc_flags(
; CHECK-SAME: ptr [[P:%.*]]) {
; 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:    [[TMP0:%.*]] = trunc nuw i64 [[INDEX]] to i32
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr [8 x i8], ptr [[P]], i32 [[TMP0]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP1]], align 8
; CHECK-NEXT:    [[TMP2:%.*]] = add <4 x i64> [[WIDE_LOAD]], splat (i64 42)
; CHECK-NEXT:    store <4 x i64> [[TMP2]], ptr [[TMP1]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP3:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP3]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[EXIT:.*]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %header

header:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %header ]
  ; We can preserve nuw flags in the vectorized code:
  %trunc = trunc nuw i64 %iv to i32
  %gep = getelementptr [8 x i8], ptr %p, i32 %trunc
  %load = load i64, ptr %gep, align 8
  %add = add i64 %load, 42
  store i64 %add, ptr %gep, align 8
  %iv.next = add i64 %iv, 1
  %ec = icmp eq i64 %iv.next, 100
  br i1 %ec, label %exit, label %header

exit:
  ret void
}