llvm/test/Transforms/LoopVectorize/first-order-recurrence-invariant-backedge.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 6
; RUN: opt -passes=loop-vectorize -force-vector-width=2 \
; RUN:   -force-vector-interleave=1 -S %s | FileCheck %s

define void @invariant_backedge_phi(ptr noalias %dst, ptr noalias readonly %src, double %init, ptr noalias readonly %next.ptr, i64 %n) {
; CHECK-LABEL: define void @invariant_backedge_phi(
; CHECK-SAME: ptr noalias [[DST:%.*]], ptr noalias readonly [[SRC:%.*]], double [[INIT:%.*]], ptr noalias readonly [[NEXT_PTR:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    [[NEXT:%.*]] = load double, ptr [[NEXT_PTR]], align 8
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 2
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK:       [[VECTOR_PH]]:
; CHECK-NEXT:    [[TMP0:%.*]] = and i64 [[N]], 1
; CHECK-NEXT:    [[N_VEC:%.*]] = sub i64 [[N]], [[TMP0]]
; CHECK-NEXT:    [[BROADCAST_SPLATINSERT:%.*]] = insertelement <2 x double> poison, double [[NEXT]], i64 0
; CHECK-NEXT:    [[BROADCAST_SPLAT:%.*]] = shufflevector <2 x double> [[BROADCAST_SPLATINSERT]], <2 x double> poison, <2 x i32> zeroinitializer
; CHECK-NEXT:    [[VECTOR_RECUR_INIT:%.*]] = insertelement <2 x double> poison, double [[INIT]], i32 1
; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
; CHECK:       [[VECTOR_BODY]]:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VECTOR_RECUR:%.*]] = phi <2 x double> [ [[VECTOR_RECUR_INIT]], %[[VECTOR_PH]] ], [ [[BROADCAST_SPLAT]], %[[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = shufflevector <2 x double> [[VECTOR_RECUR]], <2 x double> [[BROADCAST_SPLAT]], <2 x i32> <i32 1, i32 2>
; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds double, ptr [[SRC]], i64 [[INDEX]]
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <2 x double>, ptr [[TMP2]], align 8
; CHECK-NEXT:    [[TMP3:%.*]] = fmul <2 x double> [[TMP1]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds double, ptr [[DST]], i64 [[INDEX]]
; CHECK-NEXT:    store <2 x double> [[TMP3]], ptr [[TMP4]], align 8
; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP5]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK:       [[MIDDLE_BLOCK]]:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
; CHECK:       [[SCALAR_PH]]:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[ENTRY]] ]
; CHECK-NEXT:    [[SCALAR_RECUR_INIT:%.*]] = phi double [ [[NEXT]], %[[MIDDLE_BLOCK]] ], [ [[INIT]], %[[ENTRY]] ]
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[FACTOR:%.*]] = phi double [ [[SCALAR_RECUR_INIT]], %[[SCALAR_PH]] ], [ [[NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    [[SRC_PTR:%.*]] = getelementptr inbounds double, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[X:%.*]] = load double, ptr [[SRC_PTR]], align 8
; CHECK-NEXT:    [[RESULT:%.*]] = fmul double [[FACTOR]], [[X]]
; CHECK-NEXT:    [[DST_PTR:%.*]] = getelementptr inbounds double, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    store double [[RESULT]], ptr [[DST_PTR]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], 1
; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  %next = load double, ptr %next.ptr, align 8
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %factor = phi double [ %init, %entry ], [ %next, %loop ]
  %src.ptr = getelementptr inbounds double, ptr %src, i64 %iv
  %x = load double, ptr %src.ptr, align 8
  %result = fmul double %factor, %x
  %dst.ptr = getelementptr inbounds double, ptr %dst, i64 %iv
  store double %result, ptr %dst.ptr, align 8
  %iv.next = add nuw i64 %iv, 1
  %done = icmp eq i64 %iv.next, %n
  br i1 %done, label %exit, label %loop

exit:
  ret void
}

define void @invariant_backedge_argument(ptr noalias %dst, ptr noalias readonly %src, double %init, double %next, i64 %n) {
; CHECK-LABEL: define void @invariant_backedge_argument(
; CHECK-SAME: ptr noalias [[DST:%.*]], ptr noalias readonly [[SRC:%.*]], double [[INIT:%.*]], double [[NEXT:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[FACTOR:%.*]] = phi double [ [[INIT]], %[[ENTRY]] ], [ [[NEXT]], %[[LOOP]] ]
; CHECK-NEXT:    [[SRC_PTR:%.*]] = getelementptr inbounds double, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[X:%.*]] = load double, ptr [[SRC_PTR]], align 8
; CHECK-NEXT:    [[RESULT:%.*]] = fmul double [[FACTOR]], [[X]]
; CHECK-NEXT:    [[DST_PTR:%.*]] = getelementptr inbounds double, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    store double [[RESULT]], ptr [[DST_PTR]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], 1
; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[DONE]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %factor = phi double [ %init, %entry ], [ %next, %loop ]
  %src.ptr = getelementptr inbounds double, ptr %src, i64 %iv
  %x = load double, ptr %src.ptr, align 8
  %result = fmul double %factor, %x
  %dst.ptr = getelementptr inbounds double, ptr %dst, i64 %iv
  store double %result, ptr %dst.ptr, align 8
  %iv.next = add nuw i64 %iv, 1
  %done = icmp eq i64 %iv.next, %n
  br i1 %done, label %exit, label %loop

exit:
  ret void
}

define void @invariant_backedge_constant(ptr noalias %dst, ptr noalias readonly %src, double %init, i64 %n) {
; CHECK-LABEL: define void @invariant_backedge_constant(
; CHECK-SAME: ptr noalias [[DST:%.*]], ptr noalias readonly [[SRC:%.*]], double [[INIT:%.*]], i64 [[N:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[LOOP:.*]]
; CHECK:       [[LOOP]]:
; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
; CHECK-NEXT:    [[FACTOR:%.*]] = phi double [ [[INIT]], %[[ENTRY]] ], [ 2.000000e+00, %[[LOOP]] ]
; CHECK-NEXT:    [[SRC_PTR:%.*]] = getelementptr inbounds double, ptr [[SRC]], i64 [[IV]]
; CHECK-NEXT:    [[X:%.*]] = load double, ptr [[SRC_PTR]], align 8
; CHECK-NEXT:    [[RESULT:%.*]] = fmul double [[FACTOR]], [[X]]
; CHECK-NEXT:    [[DST_PTR:%.*]] = getelementptr inbounds double, ptr [[DST]], i64 [[IV]]
; CHECK-NEXT:    store double [[RESULT]], ptr [[DST_PTR]], align 8
; CHECK-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], 1
; CHECK-NEXT:    [[DONE:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; CHECK-NEXT:    br i1 [[DONE]], label %[[EXIT:.*]], label %[[LOOP]]
; CHECK:       [[EXIT]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
  %factor = phi double [ %init, %entry ], [ 2.000000e+00, %loop ]
  %src.ptr = getelementptr inbounds double, ptr %src, i64 %iv
  %x = load double, ptr %src.ptr, align 8
  %result = fmul double %factor, %x
  %dst.ptr = getelementptr inbounds double, ptr %dst, i64 %iv
  store double %result, ptr %dst.ptr, align 8
  %iv.next = add nuw i64 %iv, 1
  %done = icmp eq i64 %iv.next, %n
  br i1 %done, label %exit, label %loop

exit:
  ret void
}