llvm/test/Transforms/LoopVectorize/vplan-widen-select-instruction.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "scalar.ph\:" --version 5
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -enable-vplan-native-path -S %s | FileCheck %s

; Test that VPlan native path is able to widen select instruction in the
; innermost loop under different conditions when outer loop is marked to be
; vectorized. These conditions include following:
; * Inner and outer loop invariant select condition
; * Select condition depending on outer loop iteration variable.
; * Select condidition depending on inner loop iteration variable.
; * Select conditition depending on both outer and inner loop iteration
;   variables.

define void @loop_invariant_select(ptr noalias nocapture %out, i1 %select, double %a, double %b) {
; CHECK-LABEL: define void @loop_invariant_select(
; CHECK-SAME: ptr noalias captures(none) [[OUT:%.*]], i1 [[SELECT:%.*]], double [[A:%.*]], double [[B:%.*]]) {
; 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_LATCH:.*]] ]
; CHECK-NEXT:    [[TMP3:%.*]] = getelementptr inbounds double, ptr [[OUT]], i64 [[INDEX]]
; CHECK-NEXT:    br label %[[FOR2_HEADER3:.*]]
; CHECK:       [[FOR2_HEADER3]]:
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_BODY]] ], [ [[TMP2:%.*]], %[[FOR2_HEADER3]] ]
; CHECK-NEXT:    [[TMP7:%.*]] = select i1 [[SELECT]], double [[A]], double [[B]]
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x double> poison, double [[TMP7]], i64 0
; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    store <4 x double> [[TMP1]], ptr [[TMP3]], align 8
; CHECK-NEXT:    [[TMP2]] = add nuw nsw <4 x i64> [[VEC_PHI]], splat (i64 1)
; CHECK-NEXT:    [[TMP4:%.*]] = icmp eq <4 x i64> [[TMP2]], splat (i64 10000)
; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <4 x i1> [[TMP4]], i64 0
; CHECK-NEXT:    br i1 [[TMP5]], label %[[VECTOR_LATCH]], label %[[FOR2_HEADER3]]
; CHECK:       [[VECTOR_LATCH]]:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[SCALAR_PH:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for1.header

for1.header:
  %indvar1 = phi i64 [ 0, %entry ], [ %indvar11, %for1.latch ]
  %ptr = getelementptr inbounds double, ptr %out, i64 %indvar1
  br label %for2.header

for2.header:
  %indvar2 = phi i64 [ 0, %for1.header ], [ %indvar21, %for2.header ]
  ; Select condition is loop invariant for both inner and outer loop.
  %select.b = select i1 %select, double %a, double %b
  store double %select.b, ptr %ptr, align 8
  %indvar21 = add nuw nsw i64 %indvar2, 1
  %for2.cond = icmp eq i64 %indvar21, 10000
  br i1 %for2.cond, label %for1.latch, label %for2.header

for1.latch:
  %indvar11 = add nuw nsw i64 %indvar1, 1
  %for1.cond = icmp eq i64 %indvar11, 1000
  br i1 %for1.cond, label %exit, label %for1.header, !llvm.loop !0

exit:
  ret void
}

define void @outer_loop_dependant_select(ptr noalias nocapture %out, double %a, double %b) {
; CHECK-LABEL: define void @outer_loop_dependant_select(
; CHECK-SAME: ptr noalias captures(none) [[OUT:%.*]], double [[A:%.*]], double [[B:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x double> poison, double [[A]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT2:%.*]] = insertelement <4 x double> poison, double [[B]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT3:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT2]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_LATCH:.*]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_LATCH]] ]
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds double, ptr [[OUT]], i64 [[INDEX]]
; CHECK-NEXT:    br label %[[FOR2_HEADER3:.*]]
; CHECK:       [[FOR2_HEADER3]]:
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_BODY]] ], [ [[TMP3:%.*]], %[[FOR2_HEADER3]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc <4 x i64> [[VEC_IND]] to <4 x i1>
; CHECK-NEXT:    [[TMP2:%.*]] = select <4 x i1> [[TMP1]], <4 x double> [[BROADCAST_SPLAT]], <4 x double> [[BROADCAST_SPLAT3]]
; CHECK-NEXT:    store <4 x double> [[TMP2]], ptr [[TMP4]], align 8
; CHECK-NEXT:    [[TMP3]] = add nuw nsw <4 x i64> [[VEC_PHI]], splat (i64 1)
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq <4 x i64> [[TMP3]], splat (i64 10000)
; CHECK-NEXT:    [[TMP6:%.*]] = extractelement <4 x i1> [[TMP5]], i64 0
; CHECK-NEXT:    br i1 [[TMP6]], label %[[VECTOR_LATCH]], label %[[FOR2_HEADER3]]
; CHECK:       [[VECTOR_LATCH]]:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add nuw nsw <4 x i64> [[VEC_IND]], splat (i64 4)
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TMP7]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[SCALAR_PH:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for1.header

for1.header:
  %indvar1 = phi i64 [ 0, %entry ], [ %indvar11, %for1.latch ]
  %ptr = getelementptr inbounds double, ptr %out, i64 %indvar1
  br label %for2.header

for2.header:
  %indvar2 = phi i64 [ 0, %for1.header ], [ %indvar21, %for2.header ]
  %select = trunc i64 %indvar1 to i1
  ; Select condition only depends on outer loop iteration variable.
  %select.b = select i1 %select, double %a, double %b
  store double %select.b, ptr %ptr, align 8
  %indvar21 = add nuw nsw i64 %indvar2, 1
  %for2.cond = icmp eq i64 %indvar21, 10000
  br i1 %for2.cond, label %for1.latch, label %for2.header

for1.latch:
  %indvar11 = add nuw nsw i64 %indvar1, 1
  %for1.cond = icmp eq i64 %indvar11, 1000
  br i1 %for1.cond, label %exit, label %for1.header, !llvm.loop !0

exit:
  ret void
}

define void @inner_loop_dependant_select(ptr noalias nocapture %out, double %a, double %b) {
; CHECK-LABEL: define void @inner_loop_dependant_select(
; CHECK-SAME: ptr noalias captures(none) [[OUT:%.*]], double [[A:%.*]], double [[B:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x double> poison, double [[A]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT2:%.*]] = insertelement <4 x double> poison, double [[B]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT3:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT2]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_LATCH:.*]] ]
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds double, ptr [[OUT]], i64 [[INDEX]]
; CHECK-NEXT:    br label %[[FOR2_HEADER3:.*]]
; CHECK:       [[FOR2_HEADER3]]:
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_BODY]] ], [ [[TMP3:%.*]], %[[FOR2_HEADER3]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc <4 x i64> [[VEC_PHI]] to <4 x i1>
; CHECK-NEXT:    [[TMP2:%.*]] = select <4 x i1> [[TMP1]], <4 x double> [[BROADCAST_SPLAT]], <4 x double> [[BROADCAST_SPLAT3]]
; CHECK-NEXT:    store <4 x double> [[TMP2]], ptr [[TMP4]], align 8
; CHECK-NEXT:    [[TMP3]] = add nuw nsw <4 x i64> [[VEC_PHI]], splat (i64 1)
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq <4 x i64> [[TMP3]], splat (i64 10000)
; CHECK-NEXT:    [[TMP6:%.*]] = extractelement <4 x i1> [[TMP5]], i64 0
; CHECK-NEXT:    br i1 [[TMP6]], label %[[VECTOR_LATCH]], label %[[FOR2_HEADER3]]
; CHECK:       [[VECTOR_LATCH]]:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TMP7]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[SCALAR_PH:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for1.header

for1.header:
  %indvar1 = phi i64 [ 0, %entry ], [ %indvar11, %for1.latch ]
  %ptr = getelementptr inbounds double, ptr %out, i64 %indvar1
  br label %for2.header

for2.header:
  %indvar2 = phi i64 [ 0, %for1.header ], [ %indvar21, %for2.header ]
  %select = trunc i64 %indvar2 to i1
  ; Select condition only depends on inner loop iteration variable.
  %select.b = select i1 %select, double %a, double %b
  store double %select.b, ptr %ptr, align 8
  %indvar21 = add nuw nsw i64 %indvar2, 1
  %for2.cond = icmp eq i64 %indvar21, 10000
  br i1 %for2.cond, label %for1.latch, label %for2.header

for1.latch:
  %indvar11 = add nuw nsw i64 %indvar1, 1
  %for1.cond = icmp eq i64 %indvar11, 1000
  br i1 %for1.cond, label %exit, label %for1.header, !llvm.loop !0

exit:
  ret void
}

define void @outer_and_inner_loop_dependant_select(ptr noalias nocapture %out, double %a, double %b) {
; CHECK-LABEL: define void @outer_and_inner_loop_dependant_select(
; CHECK-SAME: ptr noalias captures(none) [[OUT:%.*]], double [[A:%.*]], double [[B:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x double> poison, double [[A]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT2:%.*]] = insertelement <4 x double> poison, double [[B]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT3:%.*]] = shufflevector <4 x double> [[BROADCAST_SPLATINSERT2]], <4 x double> poison, <4 x i32> zeroinitializer
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_LATCH:.*]] ]
; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_LATCH]] ]
; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds double, ptr [[OUT]], i64 [[INDEX]]
; CHECK-NEXT:    br label %[[FOR2_HEADER3:.*]]
; CHECK:       [[FOR2_HEADER3]]:
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_BODY]] ], [ [[TMP4:%.*]], %[[FOR2_HEADER3]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add nuw nsw <4 x i64> [[VEC_IND]], [[VEC_PHI]]
; CHECK-NEXT:    [[TMP2:%.*]] = trunc <4 x i64> [[TMP1]] to <4 x i1>
; CHECK-NEXT:    [[TMP3:%.*]] = select <4 x i1> [[TMP2]], <4 x double> [[BROADCAST_SPLAT]], <4 x double> [[BROADCAST_SPLAT3]]
; CHECK-NEXT:    store <4 x double> [[TMP3]], ptr [[TMP5]], align 8
; CHECK-NEXT:    [[TMP4]] = add nuw nsw <4 x i64> [[VEC_PHI]], splat (i64 1)
; CHECK-NEXT:    [[TMP6:%.*]] = icmp eq <4 x i64> [[TMP4]], splat (i64 10000)
; CHECK-NEXT:    [[TMP7:%.*]] = extractelement <4 x i1> [[TMP6]], i64 0
; CHECK-NEXT:    br i1 [[TMP7]], label %[[VECTOR_LATCH]], label %[[FOR2_HEADER3]]
; CHECK:       [[VECTOR_LATCH]]:
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT:    [[VEC_IND_NEXT]] = add nuw nsw <4 x i64> [[VEC_IND]], splat (i64 4)
; CHECK-NEXT:    [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000
; CHECK-NEXT:    br i1 [[TMP8]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    br label %[[SCALAR_PH:.*]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %for1.header

for1.header:
  %indvar1 = phi i64 [ 0, %entry ], [ %indvar11, %for1.latch ]
  %ptr = getelementptr inbounds double, ptr %out, i64 %indvar1
  br label %for2.header

for2.header:
  %indvar2 = phi i64 [ 0, %for1.header ], [ %indvar21, %for2.header ]
  %sum = add nuw nsw i64 %indvar1, %indvar2
  %select = trunc i64 %sum to i1
  ; Select condition depends on both inner and outer loop iteration variables.
  %select.b = select i1 %select, double %a, double %b
  store double %select.b, ptr %ptr, align 8
  %indvar21 = add nuw nsw i64 %indvar2, 1
  %for2.cond = icmp eq i64 %indvar21, 10000
  br i1 %for2.cond, label %for1.latch, label %for2.header

for1.latch:
  %indvar11 = add nuw nsw i64 %indvar1, 1
  %for1.cond = icmp eq i64 %indvar11, 1000
  br i1 %for1.cond, label %exit, label %for1.header, !llvm.loop !0

exit:
  ret void
}
!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.vectorize.enable"}