llvm/test/Transforms/LoopVectorize/AArch64/select-first-index-narrow.ll

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

target triple = "arm64-apple-macosx"

; Selects canonical IV truncated to i32.
define i32 @argmin_s32_i32idx_natural_vf(ptr %a) {
; CHECK-LABEL: define i32 @argmin_s32_i32idx_natural_vf(
; CHECK-SAME: ptr [[A:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 1, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i32, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[L]], [[MIN_VAL]]
; CHECK-NEXT:    [[T:%.*]] = trunc i64 [[IV]] to i32
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i32 [[T]], i32 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add i64 [[IV]], 1
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i32 @llvm.smin.i32(i32 [[L]], i32 [[MIN_VAL]])
; CHECK-NEXT:    [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], 0
; CHECK-NEXT:    br i1 [[EC]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[R:%.*]] = phi i32 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[R]]
;
entry:
  br label %loop

loop:
  %min.val = phi i32 [ 0, %entry ], [ %min.val.next, %loop ]
  %iv = phi i64 [ 1, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i32 [ 0, %entry ], [ %min.idx.next, %loop ]
  %gep = getelementptr inbounds i32, ptr %a, i64 %iv
  %l = load i32, ptr %gep
  %cmp = icmp slt i32 %l, %min.val
  %t = trunc i64 %iv to i32
  %min.idx.next = select i1 %cmp, i32 %t, i32 %min.idx
  %iv.next = add i64 %iv, 1
  %min.val.next = tail call i32 @llvm.smin.i32(i32 %l, i32 %min.val)
  %ec = icmp eq i64 %iv.next, 0
  br i1 %ec, label %exit, label %loop

exit:
  %r = phi i32 [ %min.idx.next, %loop ]
  ret i32 %r
}