test/Transforms/LoopVectorize/phi-cost.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; REQUIRES: asserts
; RUN: opt < %s -passes='function(loop-vectorize,instcombine)' -force-vector-width=2 -force-vector-interleave=1 -debug-only=loop-vectorize -disable-output -print-after=instcombine 2>&1 | FileCheck %s

target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"

; CHECK-LABEL: phi_two_incoming_values
; CHECK:       LV: Found an estimated cost of 1 for VF 2 For instruction: %i = phi i64 [ %i.next, %if.end ], [ 0, %entry ]
; CHECK:       LV: Found an estimated cost of 1 for VF 2 For instruction: %tmp5 = phi i32 [ %tmp1, %for.body ], [ %tmp4, %if.then ]
;
define void @phi_two_incoming_values(ptr noalias %a, ptr noalias %b, i64 %n) {
; CHECK-LABEL: define void @phi_two_incoming_values(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[N]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_VEC:%.*]] = and i64 [[TMP0]], -2
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP2]], align 4
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[INDEX]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt <2 x i32> [[WIDE_LOAD]], zeroinitializer
; CHECK-NEXT:    [[TMP5:%.*]] = zext <2 x i1> [[TMP4]] to <2 x i32>
; CHECK-NEXT:    [[PREDPHI:%.*]] = add <2 x i32> [[WIDE_LOAD]], [[TMP5]]
; CHECK-NEXT:    store <2 x i32> [[PREDPHI]], ptr [[TMP3]], align 4
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], %[[IF_END:.*]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I]]
; CHECK-NEXT:    [[TMP2:%.*]] = load i32, ptr [[TMP0]], align 4
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[I]]
; CHECK-NEXT:    [[TMP4:%.*]] = icmp sgt i32 [[TMP2]], 0
; CHECK-NEXT:    br i1 [[TMP4]], label %[[IF_THEN:.*]], label %[[IF_END]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    [[TMP5:%.*]] = add nuw i32 [[TMP2]], 1
; CHECK-NEXT:    br label %[[IF_END]]
; CHECK:       [[IF_END]]:
; CHECK-NEXT:    [[TMP6:%.*]] = phi i32 [ [[TMP2]], %[[FOR_BODY]] ], [ [[TMP5]], %[[IF_THEN]] ]
; CHECK-NEXT:    store i32 [[TMP6]], ptr [[TMP3]], align 4
; CHECK-NEXT:    [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i64 [[I]], [[N]]
; CHECK-NEXT:    br i1 [[COND]], label %[[FOR_END]], label %[[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %i = phi i64 [ %i.next, %if.end ], [ 0, %entry ]
  %tmp0 = getelementptr inbounds i32, ptr %a, i64 %i
  %tmp1 = load i32, ptr %tmp0, align 4
  %tmp2 = getelementptr inbounds i32, ptr %b, i64 %i
  %tmp3 = icmp sgt i32 %tmp1, 0
  br i1 %tmp3, label %if.then, label %if.end

if.then:
  %tmp4 = add i32 %tmp1, 1
  br label %if.end

if.end:
  %tmp5 = phi i32 [ %tmp1, %for.body ], [ %tmp4, %if.then ]
  store i32 %tmp5, ptr %tmp2, align 4
  %i.next = add i64 %i, 1
  %cond = icmp eq i64 %i, %n
  br i1 %cond, label %for.end, label %for.body

for.end:
  ret void
}

; CHECK-LABEL: phi_three_incoming_values
; CHECK:       LV: Found an estimated cost of 1 for VF 2 For instruction: %i = phi i64 [ %i.next, %if.end ], [ 0, %entry ]
; CHECK:       LV: Found an estimated cost of 2 for VF 2 For instruction: %tmp8 = phi i32 [ 9, %for.body ], [ 3, %if.then ], [ %tmp7, %if.else ]
;
define void @phi_three_incoming_values(ptr noalias %a, ptr noalias %b, i64 %n) {
; CHECK-LABEL: define void @phi_three_incoming_values(
; CHECK-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[N]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[N_VEC:%.*]] = and i64 [[TMP0]], -2
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP3]], align 4
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD2:%.*]] = load <2 x i32>, ptr [[TMP4]], align 4
; CHECK-NEXT:    [[TMP5:%.*]] = icmp sgt <2 x i32> [[WIDE_LOAD]], [[WIDE_LOAD2]]
; CHECK-NEXT:    [[TMP6:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD]], splat (i32 20)
; CHECK-NEXT:    [[TMP7:%.*]] = icmp slt <2 x i32> [[WIDE_LOAD2]], splat (i32 4)
; CHECK-NEXT:    [[TMP8:%.*]] = select <2 x i1> [[TMP7]], <2 x i32> splat (i32 4), <2 x i32> splat (i32 5)
; CHECK-NEXT:    [[PREDPHI:%.*]] = select <2 x i1> [[TMP6]], <2 x i32> [[TMP8]], <2 x i32> splat (i32 3)
; CHECK-NEXT:    [[PREDPHI3:%.*]] = select <2 x i1> [[TMP5]], <2 x i32> [[PREDPHI]], <2 x i32> splat (i32 9)
; CHECK-NEXT:    store <2 x i32> [[PREDPHI3]], ptr [[TMP3]], align 4
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP9]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[FOR_END:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[FOR_BODY:.*]]
; CHECK:       [[FOR_BODY]]:
; CHECK-NEXT:    [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], %[[IF_END:.*]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[I]]
; CHECK-NEXT:    [[TMP3:%.*]] = load i32, ptr [[TMP0]], align 4
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i32, ptr [[B]], i64 [[I]]
; CHECK-NEXT:    [[TMP5:%.*]] = load i32, ptr [[TMP4]], align 4
; CHECK-NEXT:    [[TMP6:%.*]] = icmp sgt i32 [[TMP3]], [[TMP5]]
; CHECK-NEXT:    br i1 [[TMP6]], label %[[IF_THEN:.*]], label %[[IF_END]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    [[TMP7:%.*]] = icmp sgt i32 [[TMP3]], 19
; CHECK-NEXT:    br i1 [[TMP7]], label %[[IF_END]], label %[[IF_ELSE:.*]]
; CHECK:       [[IF_ELSE]]:
; CHECK-NEXT:    [[TMP8:%.*]] = icmp slt i32 [[TMP5]], 4
; CHECK-NEXT:    [[TMP9:%.*]] = select i1 [[TMP8]], i32 4, i32 5
; CHECK-NEXT:    br label %[[IF_END]]
; CHECK:       [[IF_END]]:
; CHECK-NEXT:    [[TMP10:%.*]] = phi i32 [ 9, %[[FOR_BODY]] ], [ 3, %[[IF_THEN]] ], [ [[TMP9]], %[[IF_ELSE]] ]
; CHECK-NEXT:    store i32 [[TMP10]], ptr [[TMP0]], align 4
; CHECK-NEXT:    [[I_NEXT]] = add i64 [[I]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp eq i64 [[I]], [[N]]
; CHECK-NEXT:    br i1 [[COND]], label %[[FOR_END]], label %[[FOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK:       [[FOR_END]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %i = phi i64 [ %i.next, %if.end ], [ 0, %entry ]
  %tmp0 = getelementptr inbounds i32, ptr %a, i64 %i
  %tmp1 = load i32, ptr %tmp0, align 4
  %tmp2 = getelementptr inbounds i32, ptr %b, i64 %i
  %tmp3 = load i32, ptr %tmp2, align 4
  %tmp4 = icmp sgt i32 %tmp1, %tmp3
  br i1 %tmp4, label %if.then, label %if.end

if.then:
  %tmp5 = icmp sgt i32 %tmp1, 19
  br i1 %tmp5, label %if.end, label %if.else

if.else:
  %tmp6 = icmp slt i32 %tmp3, 4
  %tmp7 = select i1 %tmp6, i32 4, i32 5
  br label %if.end

if.end:
  %tmp8 = phi i32 [ 9, %for.body ], [ 3, %if.then ], [ %tmp7, %if.else ]
  store i32 %tmp8, ptr %tmp0, align 4
  %i.next = add i64 %i, 1
  %cond = icmp eq i64 %i, %n
  br i1 %cond, label %for.end, label %for.body

for.end:
  ret void
}

; Test case for https://github.com/llvm/llvm-project/issues/113794.
define i32 @red_phi_0(i32 %start, ptr %src) {
; CHECK-LABEL: define i32 @red_phi_0(
; CHECK-SAME: i32 [[START:%.*]], ptr [[SRC:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[TMP0:%.*]] = insertelement <2 x i32> <i32 poison, i32 0>, i32 [[START]], i64 0
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP1:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
; CHECK-NEXT:    br i1 [[TMP1]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[TMP2:%.*]] = call i32 @llvm.vector.reduce.add.v2i32(<2 x i32> [[TMP0]])
; CHECK-NEXT:    br i1 true, label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    br i1 poison, label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP7:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    [[RES:%.*]] = phi i32 [ poison, %[[LOOP]] ], [ [[TMP2]], %[[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    ret i32 [[RES]]
;
entry:
  br label %loop

loop:
  %red = phi i32 [ %start, %entry ], [ %red.next, %loop ]
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %red.next = add i32 0, %red
  %iv.next = add i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, 100
  br i1 %exitcond.not, label %exit, label %loop

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