llvm/test/Transforms/LoopVectorize/select-umin-first-index.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s

; Test cases for selecting the index with the minimum value.

define i64 @test_vectorize_select_umin_idx(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_idx(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_vectorize_select_umin_idx_cond_flipped(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_idx_cond_flipped(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[L]], [[MIN_VAL]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ult i64 %l, %min.val
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_vectorize_select_umin_idx_select_ops_flipped(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_idx_select_ops_flipped(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i64 [[L]], [[MIN_VAL]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[MIN_IDX]], i64 [[IV]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ult i64 %l, %min.val
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %min.idx, i64 %iv
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_vectorize_select_umin_via_select_idx(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_via_select_idx(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = select i1 [[CMP]], i64 [[L]], i64 [[MIN_VAL]]
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = select i1 %cmp, i64 %l, i64 %min.val
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_vectorize_select_umin_idx_all_exit_inst(ptr %src, ptr %umin, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_idx_all_exit_inst(
; CHECK-SAME: ptr [[SRC:%.*]], ptr [[UMIN:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    [[RES_UMIN:%.*]] = phi i64 [ [[MIN_VAL_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    store i64 [[RES_UMIN]], ptr [[UMIN]], align 4
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  %res.umin = phi i64 [ %min.val.next, %loop ]
  store i64 %res.umin, ptr %umin
  ret i64 %res
}

define i64 @test_vectorize_select_umin_idx_min_ops_switched(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_vectorize_select_umin_idx_min_ops_switched(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[L]], i64 [[MIN_VAL]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %l, i64 %min.val)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_not_vectorize_select_no_min_reduction(ptr %src, i64 %n) {
; CHECK-LABEL: define i64 @test_not_vectorize_select_no_min_reduction(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[RED_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[RED_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[RED_VAL]], [[L]]
; CHECK-NEXT:    [[RED_VAL_NEXT]] = add i64 [[RED_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %red.val = phi i64 [ 0, %entry ], [ %red.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %red.val, %l
  %red.val.next = add i64 %red.val, %l
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_cmp_and_umin_use_different_values(ptr %src, i64 %x, i64 %n) {
; CHECK-LABEL: define i64 @test_cmp_and_umin_use_different_values(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[X:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[X]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %x
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i32 @test_vectorize_select_umin_idx_with_trunc(ptr %src, i64 %n) {
; CHECK-LABEL: define i32 @test_vectorize_select_umin_idx_with_trunc(
; CHECK-SAME: ptr [[SRC:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i32 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[TRUNC:%.*]] = trunc i64 [[IV]] to i32
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i32 [[TRUNC]], i32 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i32 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i32 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i32 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %trunc = trunc i64 %iv to i32
  %min.idx.next = select i1 %cmp, i32 %trunc, i32 %min.idx
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %exit, label %loop

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

define ptr @test_with_ptr_index(ptr %start, ptr %end) {
; CHECK-LABEL: define ptr @test_with_ptr_index(
; CHECK-SAME: ptr [[START:%.*]], ptr [[END:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi ptr [ [[START]], %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi ptr [ null, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[IV]], align 4
; CHECK-NEXT:    [[CMP7_US:%.*]] = icmp ult i64 [[L]], [[MIN_VAL]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP7_US]], ptr [[IV]], ptr [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = getelementptr i32, ptr [[IV]], i64 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq ptr [[IV_NEXT]], [[END]]
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi ptr [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret ptr [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi ptr [ %start, %entry ], [ %iv.next, %loop ]
  %min.idx = phi ptr [ null, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %l = load i64, ptr %iv
  %cmp7.us = icmp ult i64 %l, %min.val
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp7.us, ptr %iv, ptr %min.idx
  %iv.next = getelementptr i32, ptr %iv, i64 1
  %exitcond.not = icmp eq ptr %iv.next, %end
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi ptr [ %min.idx.next, %loop ]
  ret ptr %res
}

define i64 @test_no_vectorize_select_iv_decrement(ptr %src) {
; CHECK-LABEL: define i64 @test_no_vectorize_select_iv_decrement(
; CHECK-SAME: ptr [[SRC:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 1000, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], -1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 0
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 1000, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = add nuw nsw i64 %iv, -1
  %exitcond.not = icmp eq i64 %iv.next, 0
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_no_vectorize_select_iv_sub(ptr %src) {
; CHECK-LABEL: define i64 @test_no_vectorize_select_iv_sub(
; CHECK-SAME: ptr [[SRC:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 1000, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = sub i64 [[IV]], 1
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 0
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 1000, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = sub i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, 0
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

define i64 @test_no_vectorize_select_iv_mul(ptr %src) {
; CHECK-LABEL: define i64 @test_no_vectorize_select_iv_mul(
; CHECK-SAME: ptr [[SRC:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 1, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_IDX:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_IDX_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[MIN_VAL:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[MIN_VAL_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i64, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[L:%.*]] = load i64, ptr [[GEP]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp ugt i64 [[MIN_VAL]], [[L]]
; CHECK-NEXT:    [[MIN_VAL_NEXT]] = tail call i64 @llvm.umin.i64(i64 [[MIN_VAL]], i64 [[L]])
; CHECK-NEXT:    [[MIN_IDX_NEXT]] = select i1 [[CMP]], i64 [[IV]], i64 [[MIN_IDX]]
; CHECK-NEXT:    [[IV_NEXT]] = mul i64 [[IV]], 2
; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 128
; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i64 [ [[MIN_IDX_NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    ret i64 [[RES]]
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 1, %entry ], [ %iv.next, %loop ]
  %min.idx = phi i64 [ 0, %entry ], [ %min.idx.next, %loop ]
  %min.val = phi i64 [ 0, %entry ], [ %min.val.next, %loop ]
  %gep = getelementptr i64, ptr %src, i64 %iv
  %l = load i64, ptr %gep
  %cmp = icmp ugt i64 %min.val, %l
  %min.val.next = tail call i64 @llvm.umin.i64(i64 %min.val, i64 %l)
  %min.idx.next = select i1 %cmp, i64 %iv, i64 %min.idx
  %iv.next = mul i64 %iv, 2
  %exitcond.not = icmp eq i64 %iv.next, 128
  br i1 %exitcond.not, label %exit, label %loop

exit:
  %res = phi i64 [ %min.idx.next, %loop ]
  ret i64 %res
}

declare i64 @llvm.umin.i64(i64, i64)
declare i16 @llvm.umin.i16(i16, i16)