llvm/test/Transforms/LoopVectorize/RISCV/tail-folding-ordered-reduction.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=loop-vectorize \
; RUN: -force-ordered-reductions=true -hints-allow-reordering=false \
; RUN: -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue \
; RUN: -mtriple=riscv64 -mattr=+v,+f -S < %s| FileCheck %s --check-prefix=IF-EVL

; RUN: opt -passes=loop-vectorize \
; RUN: -force-ordered-reductions=true -hints-allow-reordering=false \
; RUN: -prefer-predicate-over-epilogue=scalar-epilogue \
; RUN: -mtriple=riscv64 -mattr=+v,+f -S < %s| FileCheck %s --check-prefix=NO-VP

define float @fadd(ptr noalias nocapture readonly %a, i64 %n) {
; IF-EVL-LABEL: @fadd(
; IF-EVL-NEXT:  entry:
; IF-EVL-NEXT:    br label [[VECTOR_PH:%.*]]
; IF-EVL:       vector.ph:
; IF-EVL-NEXT:    br label [[VECTOR_BODY:%.*]]
; IF-EVL:       vector.body:
; IF-EVL-NEXT:    [[EVL_BASED_IV:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT:    [[VEC_PHI:%.*]] = phi float [ 0.000000e+00, [[VECTOR_PH]] ], [ [[TMP14:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT:    [[TMP9:%.*]] = phi i64 [ [[N:%.*]], [[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], [[VECTOR_BODY]] ]
; IF-EVL-NEXT:    [[TMP10:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[TMP9]], i32 4, i1 true)
; IF-EVL-NEXT:    [[TMP12:%.*]] = getelementptr inbounds float, ptr [[A:%.*]], i64 [[EVL_BASED_IV]]
; IF-EVL-NEXT:    [[VP_OP_LOAD:%.*]] = call <vscale x 4 x float> @llvm.vp.load.nxv4f32.p0(ptr align 4 [[TMP12]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP10]])
; IF-EVL-NEXT:    [[TMP14]] = call float @llvm.vp.reduce.fadd.nxv4f32(float [[VEC_PHI]], <vscale x 4 x float> [[VP_OP_LOAD]], <vscale x 4 x i1> splat (i1 true), i32 [[TMP10]])
; IF-EVL-NEXT:    [[TMP15:%.*]] = zext i32 [[TMP10]] to i64
; IF-EVL-NEXT:    [[INDEX_EVL_NEXT]] = add i64 [[TMP15]], [[EVL_BASED_IV]]
; IF-EVL-NEXT:    [[AVL_NEXT]] = sub nuw i64 [[TMP9]], [[TMP15]]
; IF-EVL-NEXT:    [[TMP11:%.*]] = icmp eq i64 [[AVL_NEXT]], 0
; IF-EVL-NEXT:    br i1 [[TMP11]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; IF-EVL:       middle.block:
; IF-EVL-NEXT:    br label [[FOR_BODY:%.*]]
; IF-EVL:       for.end:
; IF-EVL-NEXT:    ret float [[TMP14]]
;
; NO-VP-LABEL: @fadd(
; NO-VP-NEXT:  entry:
; NO-VP-NEXT:    [[TMP0:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT:    [[TMP1:%.*]] = shl nuw i64 [[TMP0]], 2
; NO-VP-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N1:%.*]], [[TMP1]]
; NO-VP-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[ENTRY:%.*]]
; NO-VP:       vector.ph:
; NO-VP-NEXT:    [[TMP2:%.*]] = call i64 @llvm.vscale.i64()
; NO-VP-NEXT:    [[TMP3:%.*]] = mul nuw i64 [[TMP2]], 4
; NO-VP-NEXT:    [[N_MOD_VF:%.*]] = urem i64 [[N1]], [[TMP3]]
; NO-VP-NEXT:    [[N:%.*]] = sub i64 [[N1]], [[N_MOD_VF]]
; NO-VP-NEXT:    br label [[FOR_BODY:%.*]]
; NO-VP:       vector.body:
; NO-VP-NEXT:    [[IV:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[FOR_BODY]] ]
; NO-VP-NEXT:    [[SUM_07:%.*]] = phi float [ 0.000000e+00, [[ENTRY]] ], [ [[ADD:%.*]], [[FOR_BODY]] ]
; NO-VP-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[A:%.*]], i64 [[IV]]
; NO-VP-NEXT:    [[WIDE_LOAD:%.*]] = load <vscale x 4 x float>, ptr [[ARRAYIDX]], align 4
; NO-VP-NEXT:    [[ADD]] = call float @llvm.vector.reduce.fadd.nxv4f32(float [[SUM_07]], <vscale x 4 x float> [[WIDE_LOAD]])
; NO-VP-NEXT:    [[IV_NEXT]] = add nuw i64 [[IV]], [[TMP3]]
; NO-VP-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], [[N]]
; NO-VP-NEXT:    br i1 [[EXITCOND_NOT]], label [[MIDDLE_BLOCK:%.*]], label [[FOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; NO-VP:       middle.block:
; NO-VP-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N1]], [[N]]
; NO-VP-NEXT:    br i1 [[CMP_N]], label [[FOR_END:%.*]], label [[SCALAR_PH]]
; NO-VP:       scalar.ph:
; NO-VP-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY1:%.*]] ]
; NO-VP-NEXT:    [[BC_MERGE_RDX:%.*]] = phi float [ [[ADD]], [[MIDDLE_BLOCK]] ], [ 0.000000e+00, [[ENTRY1]] ]
; NO-VP-NEXT:    br label [[FOR_BODY1:%.*]]
; NO-VP:       for.body:
; NO-VP-NEXT:    [[IV1:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT1:%.*]], [[FOR_BODY1]] ]
; NO-VP-NEXT:    [[SUM_7:%.*]] = phi float [ [[BC_MERGE_RDX]], [[SCALAR_PH]] ], [ [[ADD1:%.*]], [[FOR_BODY1]] ]
; NO-VP-NEXT:    [[ARRAYIDX1:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[IV1]]
; NO-VP-NEXT:    [[TMP9:%.*]] = load float, ptr [[ARRAYIDX1]], align 4
; NO-VP-NEXT:    [[ADD1]] = fadd float [[TMP9]], [[SUM_7]]
; NO-VP-NEXT:    [[IV_NEXT1]] = add nuw nsw i64 [[IV1]], 1
; NO-VP-NEXT:    [[EXITCOND_NOT1:%.*]] = icmp eq i64 [[IV_NEXT1]], [[N1]]
; NO-VP-NEXT:    br i1 [[EXITCOND_NOT1]], label [[FOR_END]], label [[FOR_BODY1]], !llvm.loop [[LOOP3:![0-9]+]]
; NO-VP:       for.end:
; NO-VP-NEXT:    [[ADD_LCSSA:%.*]] = phi float [ [[ADD1]], [[FOR_BODY1]] ], [ [[ADD]], [[MIDDLE_BLOCK]] ]
; NO-VP-NEXT:    ret float [[ADD_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
  %sum.07 = phi float [ 0.000000e+00, %entry ], [ %add, %for.body ]
  %arrayidx = getelementptr inbounds float, ptr %a, i64 %iv
  %0 = load float, ptr %arrayidx, align 4
  %add = fadd float %0, %sum.07
  %iv.next = add nuw nsw i64 %iv, 1
  %exitcond.not = icmp eq i64 %iv.next, %n
  br i1 %exitcond.not, label %for.end, label %for.body, !llvm.loop !0

for.end:
  ret float %add
}

!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.vectorize.enable", i1 true}