; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s  -O3 -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -keep-loops=false -mcpu=core-avx2 -mtriple=x86_64-unknown-linux-gnu -S | FileCheck --check-prefix AUTO_VEC %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

; This test checks auto-vectorization with FP induction variable.
; The FP operation is not "fast" and requires "fast-math" function attribute.

;void fp_iv_loop1(float * __restrict__ A, int N) {
;  float x = 1.0;
;  for (int i=0; i < N; ++i) {
;    A[i] = x;
;    x += 0.5;
;  }
;}

define void @fp_iv_loop1(float* noalias nocapture %A, i32 %N) #0 {
; AUTO_VEC-LABEL: @fp_iv_loop1(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[CMP4:%.*]] = icmp sgt i32 [[N:%.*]], 0
; AUTO_VEC-NEXT:    br i1 [[CMP4]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; AUTO_VEC:       for.body.preheader:
; AUTO_VEC-NEXT:    [[ZEXT:%.*]] = zext i32 [[N]] to i64
; AUTO_VEC-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[N]], 32
; AUTO_VEC-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[FOR_BODY:%.*]], label [[VECTOR_PH:%.*]]
; AUTO_VEC:       vector.ph:
; AUTO_VEC-NEXT:    [[N_VEC:%.*]] = and i64 [[ZEXT]], 4294967264
; AUTO_VEC-NEXT:    [[CAST_CRD:%.*]] = sitofp i64 [[N_VEC]] to float
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = fmul fast float [[CAST_CRD]], 5.000000e-01
; AUTO_VEC-NEXT:    [[IND_END:%.*]] = fadd fast float [[TMP0]], 1.000000e+00
; AUTO_VEC-NEXT:    [[TMP1:%.*]] = add nsw i64 [[N_VEC]], -32
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = lshr exact i64 [[TMP1]], 5
; AUTO_VEC-NEXT:    [[TMP3:%.*]] = add nuw nsw i64 [[TMP2]], 1
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[TMP3]], 3
; AUTO_VEC-NEXT:    [[TMP4:%.*]] = icmp ult i64 [[TMP1]], 96
; AUTO_VEC-NEXT:    br i1 [[TMP4]], label [[MIDDLE_BLOCK_UNR_LCSSA:%.*]], label [[VECTOR_PH_NEW:%.*]]
; AUTO_VEC:       vector.ph.new:
; AUTO_VEC-NEXT:    [[UNROLL_ITER:%.*]] = and i64 [[TMP3]], 1152921504606846972
; AUTO_VEC-NEXT:    br label [[VECTOR_BODY:%.*]]
; AUTO_VEC:       vector.body:
; AUTO_VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH_NEW]] ], [ [[INDEX_NEXT_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[VEC_IND:%.*]] = phi <8 x float> [ <float 1.000000e+00, float 1.500000e+00, float 2.000000e+00, float 2.500000e+00, float 3.000000e+00, float 3.500000e+00, float 4.000000e+00, float 4.500000e+00>, [[VECTOR_PH_NEW]] ], [ [[VEC_IND_NEXT_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[NITER:%.*]] = phi i64 [ [[UNROLL_ITER]], [[VECTOR_PH_NEW]] ], [ [[NITER_NSUB_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[STEP_ADD:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00>
; AUTO_VEC-NEXT:    [[STEP_ADD2:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00>
; AUTO_VEC-NEXT:    [[STEP_ADD3:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01>
; AUTO_VEC-NEXT:    [[TMP5:%.*]] = getelementptr inbounds float, float* [[A:%.*]], i64 [[INDEX]]
; AUTO_VEC-NEXT:    [[TMP6:%.*]] = bitcast float* [[TMP5]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND]], <8 x float>* [[TMP6]], align 4
; AUTO_VEC-NEXT:    [[TMP7:%.*]] = getelementptr inbounds float, float* [[TMP5]], i64 8
; AUTO_VEC-NEXT:    [[TMP8:%.*]] = bitcast float* [[TMP7]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD]], <8 x float>* [[TMP8]], align 4
; AUTO_VEC-NEXT:    [[TMP9:%.*]] = getelementptr inbounds float, float* [[TMP5]], i64 16
; AUTO_VEC-NEXT:    [[TMP10:%.*]] = bitcast float* [[TMP9]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2]], <8 x float>* [[TMP10]], align 4
; AUTO_VEC-NEXT:    [[TMP11:%.*]] = getelementptr inbounds float, float* [[TMP5]], i64 24
; AUTO_VEC-NEXT:    [[TMP12:%.*]] = bitcast float* [[TMP11]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3]], <8 x float>* [[TMP12]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT:%.*]] = or i64 [[INDEX]], 32
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD_1:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 2.000000e+01, float 2.000000e+01, float 2.000000e+01, float 2.000000e+01, float 2.000000e+01, float 2.000000e+01, float 2.000000e+01, float 2.000000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2_1:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 2.400000e+01, float 2.400000e+01, float 2.400000e+01, float 2.400000e+01, float 2.400000e+01, float 2.400000e+01, float 2.400000e+01, float 2.400000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3_1:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 2.800000e+01, float 2.800000e+01, float 2.800000e+01, float 2.800000e+01, float 2.800000e+01, float 2.800000e+01, float 2.800000e+01, float 2.800000e+01>
; AUTO_VEC-NEXT:    [[TMP13:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDEX_NEXT]]
; AUTO_VEC-NEXT:    [[TMP14:%.*]] = bitcast float* [[TMP13]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND_NEXT]], <8 x float>* [[TMP14]], align 4
; AUTO_VEC-NEXT:    [[TMP15:%.*]] = getelementptr inbounds float, float* [[TMP13]], i64 8
; AUTO_VEC-NEXT:    [[TMP16:%.*]] = bitcast float* [[TMP15]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD_1]], <8 x float>* [[TMP16]], align 4
; AUTO_VEC-NEXT:    [[TMP17:%.*]] = getelementptr inbounds float, float* [[TMP13]], i64 16
; AUTO_VEC-NEXT:    [[TMP18:%.*]] = bitcast float* [[TMP17]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2_1]], <8 x float>* [[TMP18]], align 4
; AUTO_VEC-NEXT:    [[TMP19:%.*]] = getelementptr inbounds float, float* [[TMP13]], i64 24
; AUTO_VEC-NEXT:    [[TMP20:%.*]] = bitcast float* [[TMP19]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3_1]], <8 x float>* [[TMP20]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT_1:%.*]] = or i64 [[INDEX]], 64
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_1:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 3.200000e+01, float 3.200000e+01, float 3.200000e+01, float 3.200000e+01, float 3.200000e+01, float 3.200000e+01, float 3.200000e+01, float 3.200000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD_2:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 3.600000e+01, float 3.600000e+01, float 3.600000e+01, float 3.600000e+01, float 3.600000e+01, float 3.600000e+01, float 3.600000e+01, float 3.600000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2_2:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 4.000000e+01, float 4.000000e+01, float 4.000000e+01, float 4.000000e+01, float 4.000000e+01, float 4.000000e+01, float 4.000000e+01, float 4.000000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3_2:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 4.400000e+01, float 4.400000e+01, float 4.400000e+01, float 4.400000e+01, float 4.400000e+01, float 4.400000e+01, float 4.400000e+01, float 4.400000e+01>
; AUTO_VEC-NEXT:    [[TMP21:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDEX_NEXT_1]]
; AUTO_VEC-NEXT:    [[TMP22:%.*]] = bitcast float* [[TMP21]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND_NEXT_1]], <8 x float>* [[TMP22]], align 4
; AUTO_VEC-NEXT:    [[TMP23:%.*]] = getelementptr inbounds float, float* [[TMP21]], i64 8
; AUTO_VEC-NEXT:    [[TMP24:%.*]] = bitcast float* [[TMP23]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD_2]], <8 x float>* [[TMP24]], align 4
; AUTO_VEC-NEXT:    [[TMP25:%.*]] = getelementptr inbounds float, float* [[TMP21]], i64 16
; AUTO_VEC-NEXT:    [[TMP26:%.*]] = bitcast float* [[TMP25]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2_2]], <8 x float>* [[TMP26]], align 4
; AUTO_VEC-NEXT:    [[TMP27:%.*]] = getelementptr inbounds float, float* [[TMP21]], i64 24
; AUTO_VEC-NEXT:    [[TMP28:%.*]] = bitcast float* [[TMP27]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3_2]], <8 x float>* [[TMP28]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT_2:%.*]] = or i64 [[INDEX]], 96
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_2:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 4.800000e+01, float 4.800000e+01, float 4.800000e+01, float 4.800000e+01, float 4.800000e+01, float 4.800000e+01, float 4.800000e+01, float 4.800000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD_3:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 5.200000e+01, float 5.200000e+01, float 5.200000e+01, float 5.200000e+01, float 5.200000e+01, float 5.200000e+01, float 5.200000e+01, float 5.200000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2_3:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 5.600000e+01, float 5.600000e+01, float 5.600000e+01, float 5.600000e+01, float 5.600000e+01, float 5.600000e+01, float 5.600000e+01, float 5.600000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3_3:%.*]] = fadd fast <8 x float> [[VEC_IND]], <float 6.000000e+01, float 6.000000e+01, float 6.000000e+01, float 6.000000e+01, float 6.000000e+01, float 6.000000e+01, float 6.000000e+01, float 6.000000e+01>
; AUTO_VEC-NEXT:    [[TMP29:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDEX_NEXT_2]]
; AUTO_VEC-NEXT:    [[TMP30:%.*]] = bitcast float* [[TMP29]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND_NEXT_2]], <8 x float>* [[TMP30]], align 4
; AUTO_VEC-NEXT:    [[TMP31:%.*]] = getelementptr inbounds float, float* [[TMP29]], i64 8
; AUTO_VEC-NEXT:    [[TMP32:%.*]] = bitcast float* [[TMP31]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD_3]], <8 x float>* [[TMP32]], align 4
; AUTO_VEC-NEXT:    [[TMP33:%.*]] = getelementptr inbounds float, float* [[TMP29]], i64 16
; AUTO_VEC-NEXT:    [[TMP34:%.*]] = bitcast float* [[TMP33]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2_3]], <8 x float>* [[TMP34]], align 4
; AUTO_VEC-NEXT:    [[TMP35:%.*]] = getelementptr inbounds float, float* [[TMP29]], i64 24
; AUTO_VEC-NEXT:    [[TMP36:%.*]] = bitcast float* [[TMP35]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3_3]], <8 x float>* [[TMP36]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT_3]] = add i64 [[INDEX]], 128
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_3]] = fadd fast <8 x float> [[VEC_IND]], <float 6.400000e+01, float 6.400000e+01, float 6.400000e+01, float 6.400000e+01, float 6.400000e+01, float 6.400000e+01, float 6.400000e+01, float 6.400000e+01>
; AUTO_VEC-NEXT:    [[NITER_NSUB_3]] = add i64 [[NITER]], -4
; AUTO_VEC-NEXT:    [[NITER_NCMP_3:%.*]] = icmp eq i64 [[NITER_NSUB_3]], 0
; AUTO_VEC-NEXT:    br i1 [[NITER_NCMP_3]], label [[MIDDLE_BLOCK_UNR_LCSSA]], label [[VECTOR_BODY]], [[LOOP0:!llvm.loop !.*]]
; AUTO_VEC:       middle.block.unr-lcssa:
; AUTO_VEC-NEXT:    [[INDEX_UNR:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT_3]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[VEC_IND_UNR:%.*]] = phi <8 x float> [ <float 1.000000e+00, float 1.500000e+00, float 2.000000e+00, float 2.500000e+00, float 3.000000e+00, float 3.500000e+00, float 4.000000e+00, float 4.500000e+00>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT_3]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 0
; AUTO_VEC-NEXT:    br i1 [[LCMP_MOD_NOT]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY_EPIL:%.*]]
; AUTO_VEC:       vector.body.epil:
; AUTO_VEC-NEXT:    [[INDEX_EPIL:%.*]] = phi i64 [ [[INDEX_NEXT_EPIL:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[INDEX_UNR]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[VEC_IND_EPIL:%.*]] = phi <8 x float> [ [[VEC_IND_NEXT_EPIL:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[VEC_IND_UNR]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[EPIL_ITER:%.*]] = phi i64 [ [[EPIL_ITER_SUB:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[XTRAITER]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[STEP_ADD_EPIL:%.*]] = fadd fast <8 x float> [[VEC_IND_EPIL]], <float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00, float 4.000000e+00>
; AUTO_VEC-NEXT:    [[STEP_ADD2_EPIL:%.*]] = fadd fast <8 x float> [[VEC_IND_EPIL]], <float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00>
; AUTO_VEC-NEXT:    [[STEP_ADD3_EPIL:%.*]] = fadd fast <8 x float> [[VEC_IND_EPIL]], <float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01, float 1.200000e+01>
; AUTO_VEC-NEXT:    [[TMP37:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDEX_EPIL]]
; AUTO_VEC-NEXT:    [[TMP38:%.*]] = bitcast float* [[TMP37]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND_EPIL]], <8 x float>* [[TMP38]], align 4
; AUTO_VEC-NEXT:    [[TMP39:%.*]] = getelementptr inbounds float, float* [[TMP37]], i64 8
; AUTO_VEC-NEXT:    [[TMP40:%.*]] = bitcast float* [[TMP39]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD_EPIL]], <8 x float>* [[TMP40]], align 4
; AUTO_VEC-NEXT:    [[TMP41:%.*]] = getelementptr inbounds float, float* [[TMP37]], i64 16
; AUTO_VEC-NEXT:    [[TMP42:%.*]] = bitcast float* [[TMP41]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2_EPIL]], <8 x float>* [[TMP42]], align 4
; AUTO_VEC-NEXT:    [[TMP43:%.*]] = getelementptr inbounds float, float* [[TMP37]], i64 24
; AUTO_VEC-NEXT:    [[TMP44:%.*]] = bitcast float* [[TMP43]] to <8 x float>*
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3_EPIL]], <8 x float>* [[TMP44]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT_EPIL]] = add i64 [[INDEX_EPIL]], 32
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_EPIL]] = fadd fast <8 x float> [[VEC_IND_EPIL]], <float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01, float 1.600000e+01>
; AUTO_VEC-NEXT:    [[EPIL_ITER_SUB]] = add i64 [[EPIL_ITER]], -1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_SUB]], 0
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[MIDDLE_BLOCK]], label [[VECTOR_BODY_EPIL]], [[LOOP2:!llvm.loop !.*]]
; AUTO_VEC:       middle.block:
; AUTO_VEC-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N_VEC]], [[ZEXT]]
; AUTO_VEC-NEXT:    br i1 [[CMP_N]], label [[FOR_END]], label [[FOR_BODY]]
; AUTO_VEC:       for.body:
; AUTO_VEC-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[FOR_BODY_PREHEADER]] ], [ [[N_VEC]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[X_06:%.*]] = phi float [ [[CONV1:%.*]], [[FOR_BODY]] ], [ 1.000000e+00, [[FOR_BODY_PREHEADER]] ], [ [[IND_END]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV]]
; AUTO_VEC-NEXT:    store float [[X_06]], float* [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[CONV1]] = fadd float [[X_06]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; AUTO_VEC-NEXT:    [[TMP45:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[ZEXT]]
; AUTO_VEC-NEXT:    br i1 [[TMP45]], label [[FOR_END]], label [[FOR_BODY]], [[LOOP4:!llvm.loop !.*]]
; AUTO_VEC:       for.end:
; AUTO_VEC-NEXT:    ret void
;
entry:
  %cmp4 = icmp sgt i32 %N, 0
  br i1 %cmp4, label %for.body.preheader, label %for.end

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
  %x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
  store float %x.06, float* %arrayidx, align 4
  %conv1 = fadd float %x.06, 5.000000e-01
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

; The same as the previous, FP operation is not fast, different function attribute
; Vectorization should be rejected.
;void fp_iv_loop2(float * __restrict__ A, int N) {
;  float x = 1.0;
;  for (int i=0; i < N; ++i) {
;    A[i] = x;
;    x += 0.5;
;  }
;}

define void @fp_iv_loop2(float* noalias nocapture %A, i32 %N) #1 {
; AUTO_VEC-LABEL: @fp_iv_loop2(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[CMP4:%.*]] = icmp sgt i32 [[N:%.*]], 0
; AUTO_VEC-NEXT:    br i1 [[CMP4]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; AUTO_VEC:       for.body.preheader:
; AUTO_VEC-NEXT:    [[ZEXT:%.*]] = zext i32 [[N]] to i64
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = add nsw i64 [[ZEXT]], -1
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[ZEXT]], 7
; AUTO_VEC-NEXT:    [[TMP1:%.*]] = icmp ult i64 [[TMP0]], 7
; AUTO_VEC-NEXT:    br i1 [[TMP1]], label [[FOR_END_LOOPEXIT_UNR_LCSSA:%.*]], label [[FOR_BODY_PREHEADER_NEW:%.*]]
; AUTO_VEC:       for.body.preheader.new:
; AUTO_VEC-NEXT:    [[UNROLL_ITER:%.*]] = and i64 [[ZEXT]], 4294967288
; AUTO_VEC-NEXT:    br label [[FOR_BODY:%.*]]
; AUTO_VEC:       for.body:
; AUTO_VEC-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_BODY_PREHEADER_NEW]] ], [ [[INDVARS_IV_NEXT_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[X_06:%.*]] = phi float [ 1.000000e+00, [[FOR_BODY_PREHEADER_NEW]] ], [ [[CONV1_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[NITER:%.*]] = phi i64 [ [[UNROLL_ITER]], [[FOR_BODY_PREHEADER_NEW]] ], [ [[NITER_NSUB_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, float* [[A:%.*]], i64 [[INDVARS_IV]]
; AUTO_VEC-NEXT:    store float [[X_06]], float* [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[CONV1:%.*]] = fadd float [[X_06]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT:%.*]] = or i64 [[INDVARS_IV]], 1
; AUTO_VEC-NEXT:    [[ARRAYIDX_1:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT]]
; AUTO_VEC-NEXT:    store float [[CONV1]], float* [[ARRAYIDX_1]], align 4
; AUTO_VEC-NEXT:    [[CONV1_1:%.*]] = fadd float [[CONV1]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_1:%.*]] = or i64 [[INDVARS_IV]], 2
; AUTO_VEC-NEXT:    [[ARRAYIDX_2:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_1]]
; AUTO_VEC-NEXT:    store float [[CONV1_1]], float* [[ARRAYIDX_2]], align 4
; AUTO_VEC-NEXT:    [[CONV1_2:%.*]] = fadd float [[CONV1_1]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_2:%.*]] = or i64 [[INDVARS_IV]], 3
; AUTO_VEC-NEXT:    [[ARRAYIDX_3:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_2]]
; AUTO_VEC-NEXT:    store float [[CONV1_2]], float* [[ARRAYIDX_3]], align 4
; AUTO_VEC-NEXT:    [[CONV1_3:%.*]] = fadd float [[CONV1_2]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_3:%.*]] = or i64 [[INDVARS_IV]], 4
; AUTO_VEC-NEXT:    [[ARRAYIDX_4:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_3]]
; AUTO_VEC-NEXT:    store float [[CONV1_3]], float* [[ARRAYIDX_4]], align 4
; AUTO_VEC-NEXT:    [[CONV1_4:%.*]] = fadd float [[CONV1_3]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_4:%.*]] = or i64 [[INDVARS_IV]], 5
; AUTO_VEC-NEXT:    [[ARRAYIDX_5:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_4]]
; AUTO_VEC-NEXT:    store float [[CONV1_4]], float* [[ARRAYIDX_5]], align 4
; AUTO_VEC-NEXT:    [[CONV1_5:%.*]] = fadd float [[CONV1_4]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_5:%.*]] = or i64 [[INDVARS_IV]], 6
; AUTO_VEC-NEXT:    [[ARRAYIDX_6:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_5]]
; AUTO_VEC-NEXT:    store float [[CONV1_5]], float* [[ARRAYIDX_6]], align 4
; AUTO_VEC-NEXT:    [[CONV1_6:%.*]] = fadd float [[CONV1_5]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_6:%.*]] = or i64 [[INDVARS_IV]], 7
; AUTO_VEC-NEXT:    [[ARRAYIDX_7:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_NEXT_6]]
; AUTO_VEC-NEXT:    store float [[CONV1_6]], float* [[ARRAYIDX_7]], align 4
; AUTO_VEC-NEXT:    [[CONV1_7]] = fadd float [[CONV1_6]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_7]] = add nuw nsw i64 [[INDVARS_IV]], 8
; AUTO_VEC-NEXT:    [[NITER_NSUB_7]] = add i64 [[NITER]], -8
; AUTO_VEC-NEXT:    [[NITER_NCMP_7:%.*]] = icmp eq i64 [[NITER_NSUB_7]], 0
; AUTO_VEC-NEXT:    br i1 [[NITER_NCMP_7]], label [[FOR_END_LOOPEXIT_UNR_LCSSA]], label [[FOR_BODY]]
; AUTO_VEC:       for.end.loopexit.unr-lcssa:
; AUTO_VEC-NEXT:    [[INDVARS_IV_UNR:%.*]] = phi i64 [ 0, [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT_7]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[X_06_UNR:%.*]] = phi float [ 1.000000e+00, [[FOR_BODY_PREHEADER]] ], [ [[CONV1_7]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 0
; AUTO_VEC-NEXT:    br i1 [[LCMP_MOD_NOT]], label [[FOR_END]], label [[FOR_BODY_EPIL:%.*]]
; AUTO_VEC:       for.body.epil:
; AUTO_VEC-NEXT:    [[INDVARS_IV_EPIL:%.*]] = phi i64 [ [[INDVARS_IV_NEXT_EPIL:%.*]], [[FOR_BODY_EPIL]] ], [ [[INDVARS_IV_UNR]], [[FOR_END_LOOPEXIT_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[X_06_EPIL:%.*]] = phi float [ [[CONV1_EPIL:%.*]], [[FOR_BODY_EPIL]] ], [ [[X_06_UNR]], [[FOR_END_LOOPEXIT_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[EPIL_ITER:%.*]] = phi i64 [ [[EPIL_ITER_SUB:%.*]], [[FOR_BODY_EPIL]] ], [ [[XTRAITER]], [[FOR_END_LOOPEXIT_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX_EPIL:%.*]] = getelementptr inbounds float, float* [[A]], i64 [[INDVARS_IV_EPIL]]
; AUTO_VEC-NEXT:    store float [[X_06_EPIL]], float* [[ARRAYIDX_EPIL]], align 4
; AUTO_VEC-NEXT:    [[CONV1_EPIL]] = fadd float [[X_06_EPIL]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_EPIL]] = add nuw nsw i64 [[INDVARS_IV_EPIL]], 1
; AUTO_VEC-NEXT:    [[EPIL_ITER_SUB]] = add i64 [[EPIL_ITER]], -1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_SUB]], 0
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[FOR_END]], label [[FOR_BODY_EPIL]], [[LOOP6:!llvm.loop !.*]]
; AUTO_VEC:       for.end:
; AUTO_VEC-NEXT:    ret void
;
entry:
  %cmp4 = icmp sgt i32 %N, 0
  br i1 %cmp4, label %for.body.preheader, label %for.end

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
  %x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
  store float %x.06, float* %arrayidx, align 4
  %conv1 = fadd float %x.06, 5.000000e-01
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

define double @external_use_with_fast_math(double* %a, i64 %n) {
; AUTO_VEC-LABEL: @external_use_with_fast_math(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = icmp sgt i64 [[N:%.*]], 1
; AUTO_VEC-NEXT:    [[SMAX:%.*]] = select i1 [[TMP0]], i64 [[N]], i64 1
; AUTO_VEC-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[SMAX]], 16
; AUTO_VEC-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[FOR_BODY:%.*]], label [[VECTOR_PH:%.*]]
; AUTO_VEC:       vector.ph:
; AUTO_VEC-NEXT:    [[N_VEC:%.*]] = and i64 [[SMAX]], 9223372036854775792
; AUTO_VEC-NEXT:    [[CAST_CRD:%.*]] = sitofp i64 [[N_VEC]] to double
; AUTO_VEC-NEXT:    [[TMP1:%.*]] = fmul fast double [[CAST_CRD]], 3.000000e+00
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = add nsw i64 [[N_VEC]], -16
; AUTO_VEC-NEXT:    [[TMP3:%.*]] = lshr exact i64 [[TMP2]], 4
; AUTO_VEC-NEXT:    [[TMP4:%.*]] = add nuw nsw i64 [[TMP3]], 1
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[TMP4]], 3
; AUTO_VEC-NEXT:    [[TMP5:%.*]] = icmp ult i64 [[TMP2]], 48
; AUTO_VEC-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK_UNR_LCSSA:%.*]], label [[VECTOR_PH_NEW:%.*]]
; AUTO_VEC:       vector.ph.new:
; AUTO_VEC-NEXT:    [[UNROLL_ITER:%.*]] = and i64 [[TMP4]], 2305843009213693948
; AUTO_VEC-NEXT:    br label [[VECTOR_BODY:%.*]]
; AUTO_VEC:       vector.body:
; AUTO_VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH_NEW]] ], [ [[INDEX_NEXT_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[VEC_IND:%.*]] = phi <4 x double> [ <double 0.000000e+00, double 3.000000e+00, double 6.000000e+00, double 9.000000e+00>, [[VECTOR_PH_NEW]] ], [ [[VEC_IND_NEXT_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[NITER:%.*]] = phi i64 [ [[UNROLL_ITER]], [[VECTOR_PH_NEW]] ], [ [[NITER_NSUB_3:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[STEP_ADD:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.200000e+01, double 1.200000e+01, double 1.200000e+01, double 1.200000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 2.400000e+01, double 2.400000e+01, double 2.400000e+01, double 2.400000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 3.600000e+01, double 3.600000e+01, double 3.600000e+01, double 3.600000e+01>
; AUTO_VEC-NEXT:    [[TMP6:%.*]] = getelementptr double, double* [[A:%.*]], i64 [[INDEX]]
; AUTO_VEC-NEXT:    [[TMP7:%.*]] = bitcast double* [[TMP6]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND]], <4 x double>* [[TMP7]], align 8
; AUTO_VEC-NEXT:    [[TMP8:%.*]] = getelementptr double, double* [[TMP6]], i64 4
; AUTO_VEC-NEXT:    [[TMP9:%.*]] = bitcast double* [[TMP8]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD]], <4 x double>* [[TMP9]], align 8
; AUTO_VEC-NEXT:    [[TMP10:%.*]] = getelementptr double, double* [[TMP6]], i64 8
; AUTO_VEC-NEXT:    [[TMP11:%.*]] = bitcast double* [[TMP10]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2]], <4 x double>* [[TMP11]], align 8
; AUTO_VEC-NEXT:    [[TMP12:%.*]] = getelementptr double, double* [[TMP6]], i64 12
; AUTO_VEC-NEXT:    [[TMP13:%.*]] = bitcast double* [[TMP12]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3]], <4 x double>* [[TMP13]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT:%.*]] = or i64 [[INDEX]], 16
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 4.800000e+01, double 4.800000e+01, double 4.800000e+01, double 4.800000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD_1:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 6.000000e+01, double 6.000000e+01, double 6.000000e+01, double 6.000000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2_1:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 7.200000e+01, double 7.200000e+01, double 7.200000e+01, double 7.200000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3_1:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 8.400000e+01, double 8.400000e+01, double 8.400000e+01, double 8.400000e+01>
; AUTO_VEC-NEXT:    [[TMP14:%.*]] = getelementptr double, double* [[A]], i64 [[INDEX_NEXT]]
; AUTO_VEC-NEXT:    [[TMP15:%.*]] = bitcast double* [[TMP14]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND_NEXT]], <4 x double>* [[TMP15]], align 8
; AUTO_VEC-NEXT:    [[TMP16:%.*]] = getelementptr double, double* [[TMP14]], i64 4
; AUTO_VEC-NEXT:    [[TMP17:%.*]] = bitcast double* [[TMP16]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD_1]], <4 x double>* [[TMP17]], align 8
; AUTO_VEC-NEXT:    [[TMP18:%.*]] = getelementptr double, double* [[TMP14]], i64 8
; AUTO_VEC-NEXT:    [[TMP19:%.*]] = bitcast double* [[TMP18]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2_1]], <4 x double>* [[TMP19]], align 8
; AUTO_VEC-NEXT:    [[TMP20:%.*]] = getelementptr double, double* [[TMP14]], i64 12
; AUTO_VEC-NEXT:    [[TMP21:%.*]] = bitcast double* [[TMP20]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3_1]], <4 x double>* [[TMP21]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT_1:%.*]] = or i64 [[INDEX]], 32
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_1:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 9.600000e+01, double 9.600000e+01, double 9.600000e+01, double 9.600000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD_2:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.080000e+02, double 1.080000e+02, double 1.080000e+02, double 1.080000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD2_2:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.200000e+02, double 1.200000e+02, double 1.200000e+02, double 1.200000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD3_2:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.320000e+02, double 1.320000e+02, double 1.320000e+02, double 1.320000e+02>
; AUTO_VEC-NEXT:    [[TMP22:%.*]] = getelementptr double, double* [[A]], i64 [[INDEX_NEXT_1]]
; AUTO_VEC-NEXT:    [[TMP23:%.*]] = bitcast double* [[TMP22]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND_NEXT_1]], <4 x double>* [[TMP23]], align 8
; AUTO_VEC-NEXT:    [[TMP24:%.*]] = getelementptr double, double* [[TMP22]], i64 4
; AUTO_VEC-NEXT:    [[TMP25:%.*]] = bitcast double* [[TMP24]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD_2]], <4 x double>* [[TMP25]], align 8
; AUTO_VEC-NEXT:    [[TMP26:%.*]] = getelementptr double, double* [[TMP22]], i64 8
; AUTO_VEC-NEXT:    [[TMP27:%.*]] = bitcast double* [[TMP26]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2_2]], <4 x double>* [[TMP27]], align 8
; AUTO_VEC-NEXT:    [[TMP28:%.*]] = getelementptr double, double* [[TMP22]], i64 12
; AUTO_VEC-NEXT:    [[TMP29:%.*]] = bitcast double* [[TMP28]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3_2]], <4 x double>* [[TMP29]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT_2:%.*]] = or i64 [[INDEX]], 48
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_2:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.440000e+02, double 1.440000e+02, double 1.440000e+02, double 1.440000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD_3:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.560000e+02, double 1.560000e+02, double 1.560000e+02, double 1.560000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD2_3:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.680000e+02, double 1.680000e+02, double 1.680000e+02, double 1.680000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD3_3:%.*]] = fadd fast <4 x double> [[VEC_IND]], <double 1.800000e+02, double 1.800000e+02, double 1.800000e+02, double 1.800000e+02>
; AUTO_VEC-NEXT:    [[TMP30:%.*]] = getelementptr double, double* [[A]], i64 [[INDEX_NEXT_2]]
; AUTO_VEC-NEXT:    [[TMP31:%.*]] = bitcast double* [[TMP30]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND_NEXT_2]], <4 x double>* [[TMP31]], align 8
; AUTO_VEC-NEXT:    [[TMP32:%.*]] = getelementptr double, double* [[TMP30]], i64 4
; AUTO_VEC-NEXT:    [[TMP33:%.*]] = bitcast double* [[TMP32]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD_3]], <4 x double>* [[TMP33]], align 8
; AUTO_VEC-NEXT:    [[TMP34:%.*]] = getelementptr double, double* [[TMP30]], i64 8
; AUTO_VEC-NEXT:    [[TMP35:%.*]] = bitcast double* [[TMP34]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2_3]], <4 x double>* [[TMP35]], align 8
; AUTO_VEC-NEXT:    [[TMP36:%.*]] = getelementptr double, double* [[TMP30]], i64 12
; AUTO_VEC-NEXT:    [[TMP37:%.*]] = bitcast double* [[TMP36]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3_3]], <4 x double>* [[TMP37]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT_3]] = add i64 [[INDEX]], 64
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_3]] = fadd fast <4 x double> [[VEC_IND]], <double 1.920000e+02, double 1.920000e+02, double 1.920000e+02, double 1.920000e+02>
; AUTO_VEC-NEXT:    [[NITER_NSUB_3]] = add i64 [[NITER]], -4
; AUTO_VEC-NEXT:    [[NITER_NCMP_3:%.*]] = icmp eq i64 [[NITER_NSUB_3]], 0
; AUTO_VEC-NEXT:    br i1 [[NITER_NCMP_3]], label [[MIDDLE_BLOCK_UNR_LCSSA]], label [[VECTOR_BODY]], [[LOOP7:!llvm.loop !.*]]
; AUTO_VEC:       middle.block.unr-lcssa:
; AUTO_VEC-NEXT:    [[INDEX_UNR:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT_3]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[VEC_IND_UNR:%.*]] = phi <4 x double> [ <double 0.000000e+00, double 3.000000e+00, double 6.000000e+00, double 9.000000e+00>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT_3]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 0
; AUTO_VEC-NEXT:    br i1 [[LCMP_MOD_NOT]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY_EPIL:%.*]]
; AUTO_VEC:       vector.body.epil:
; AUTO_VEC-NEXT:    [[INDEX_EPIL:%.*]] = phi i64 [ [[INDEX_NEXT_EPIL:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[INDEX_UNR]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[VEC_IND_EPIL:%.*]] = phi <4 x double> [ [[VEC_IND_NEXT_EPIL:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[VEC_IND_UNR]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[EPIL_ITER:%.*]] = phi i64 [ [[EPIL_ITER_SUB:%.*]], [[VECTOR_BODY_EPIL]] ], [ [[XTRAITER]], [[MIDDLE_BLOCK_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[STEP_ADD_EPIL:%.*]] = fadd fast <4 x double> [[VEC_IND_EPIL]], <double 1.200000e+01, double 1.200000e+01, double 1.200000e+01, double 1.200000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD2_EPIL:%.*]] = fadd fast <4 x double> [[VEC_IND_EPIL]], <double 2.400000e+01, double 2.400000e+01, double 2.400000e+01, double 2.400000e+01>
; AUTO_VEC-NEXT:    [[STEP_ADD3_EPIL:%.*]] = fadd fast <4 x double> [[VEC_IND_EPIL]], <double 3.600000e+01, double 3.600000e+01, double 3.600000e+01, double 3.600000e+01>
; AUTO_VEC-NEXT:    [[TMP38:%.*]] = getelementptr double, double* [[A]], i64 [[INDEX_EPIL]]
; AUTO_VEC-NEXT:    [[TMP39:%.*]] = bitcast double* [[TMP38]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND_EPIL]], <4 x double>* [[TMP39]], align 8
; AUTO_VEC-NEXT:    [[TMP40:%.*]] = getelementptr double, double* [[TMP38]], i64 4
; AUTO_VEC-NEXT:    [[TMP41:%.*]] = bitcast double* [[TMP40]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD_EPIL]], <4 x double>* [[TMP41]], align 8
; AUTO_VEC-NEXT:    [[TMP42:%.*]] = getelementptr double, double* [[TMP38]], i64 8
; AUTO_VEC-NEXT:    [[TMP43:%.*]] = bitcast double* [[TMP42]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2_EPIL]], <4 x double>* [[TMP43]], align 8
; AUTO_VEC-NEXT:    [[TMP44:%.*]] = getelementptr double, double* [[TMP38]], i64 12
; AUTO_VEC-NEXT:    [[TMP45:%.*]] = bitcast double* [[TMP44]] to <4 x double>*
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3_EPIL]], <4 x double>* [[TMP45]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT_EPIL]] = add i64 [[INDEX_EPIL]], 16
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT_EPIL]] = fadd fast <4 x double> [[VEC_IND_EPIL]], <double 4.800000e+01, double 4.800000e+01, double 4.800000e+01, double 4.800000e+01>
; AUTO_VEC-NEXT:    [[EPIL_ITER_SUB]] = add i64 [[EPIL_ITER]], -1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_SUB]], 0
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[MIDDLE_BLOCK]], label [[VECTOR_BODY_EPIL]], [[LOOP8:!llvm.loop !.*]]
; AUTO_VEC:       middle.block:
; AUTO_VEC-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[SMAX]], [[N_VEC]]
; AUTO_VEC-NEXT:    [[TMP46:%.*]] = add nsw i64 [[N_VEC]], -1
; AUTO_VEC-NEXT:    [[CAST_CMO:%.*]] = sitofp i64 [[TMP46]] to double
; AUTO_VEC-NEXT:    [[TMP47:%.*]] = fmul fast double [[CAST_CMO]], 3.000000e+00
; AUTO_VEC-NEXT:    br i1 [[CMP_N]], label [[FOR_END:%.*]], label [[FOR_BODY]]
; AUTO_VEC:       for.body:
; AUTO_VEC-NEXT:    [[I:%.*]] = phi i64 [ [[I_NEXT:%.*]], [[FOR_BODY]] ], [ 0, [[ENTRY:%.*]] ], [ [[N_VEC]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[J:%.*]] = phi double [ [[J_NEXT:%.*]], [[FOR_BODY]] ], [ 0.000000e+00, [[ENTRY]] ], [ [[TMP1]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[T0:%.*]] = getelementptr double, double* [[A]], i64 [[I]]
; AUTO_VEC-NEXT:    store double [[J]], double* [[T0]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT]] = add nuw nsw i64 [[I]], 1
; AUTO_VEC-NEXT:    [[J_NEXT]] = fadd fast double [[J]], 3.000000e+00
; AUTO_VEC-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[I_NEXT]], [[SMAX]]
; AUTO_VEC-NEXT:    br i1 [[EXITCOND_NOT]], label [[FOR_END]], label [[FOR_BODY]], [[LOOP9:!llvm.loop !.*]]
; AUTO_VEC:       for.end:
; AUTO_VEC-NEXT:    [[J_LCSSA:%.*]] = phi double [ [[TMP47]], [[MIDDLE_BLOCK]] ], [ [[J]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    ret double [[J_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %i = phi i64 [ 0, %entry ], [%i.next, %for.body]
  %j = phi double [ 0.0, %entry ], [ %j.next, %for.body ]
  %t0 = getelementptr double, double* %a, i64 %i
  store double %j, double* %t0
  %i.next = add i64 %i, 1
  %j.next = fadd fast double %j, 3.0
  %cond = icmp slt i64 %i.next, %n
  br i1 %cond, label %for.body, label %for.end

for.end:
  %t1 = phi double [ %j, %for.body ]
  ret double %t1
}

define double @external_use_without_fast_math(double* %a, i64 %n) {
; AUTO_VEC-LABEL: @external_use_without_fast_math(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = icmp sgt i64 [[N:%.*]], 1
; AUTO_VEC-NEXT:    [[SMAX:%.*]] = select i1 [[TMP0]], i64 [[N]], i64 1
; AUTO_VEC-NEXT:    [[TMP1:%.*]] = add nsw i64 [[SMAX]], -1
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[SMAX]], 7
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = icmp ult i64 [[TMP1]], 7
; AUTO_VEC-NEXT:    br i1 [[TMP2]], label [[FOR_END_UNR_LCSSA:%.*]], label [[ENTRY_NEW:%.*]]
; AUTO_VEC:       entry.new:
; AUTO_VEC-NEXT:    [[UNROLL_ITER:%.*]] = and i64 [[SMAX]], 9223372036854775800
; AUTO_VEC-NEXT:    br label [[FOR_BODY:%.*]]
; AUTO_VEC:       for.body:
; AUTO_VEC-NEXT:    [[I:%.*]] = phi i64 [ 0, [[ENTRY_NEW]] ], [ [[I_NEXT_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[J:%.*]] = phi double [ 0.000000e+00, [[ENTRY_NEW]] ], [ [[J_NEXT_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[NITER:%.*]] = phi i64 [ [[UNROLL_ITER]], [[ENTRY_NEW]] ], [ [[NITER_NSUB_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[T0:%.*]] = getelementptr double, double* [[A:%.*]], i64 [[I]]
; AUTO_VEC-NEXT:    store double [[J]], double* [[T0]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT:%.*]] = or i64 [[I]], 1
; AUTO_VEC-NEXT:    [[J_NEXT:%.*]] = fadd double [[J]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_1:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT]]
; AUTO_VEC-NEXT:    store double [[J_NEXT]], double* [[T0_1]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_1:%.*]] = or i64 [[I]], 2
; AUTO_VEC-NEXT:    [[J_NEXT_1:%.*]] = fadd double [[J_NEXT]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_2:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_1]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_1]], double* [[T0_2]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_2:%.*]] = or i64 [[I]], 3
; AUTO_VEC-NEXT:    [[J_NEXT_2:%.*]] = fadd double [[J_NEXT_1]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_3:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_2]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_2]], double* [[T0_3]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_3:%.*]] = or i64 [[I]], 4
; AUTO_VEC-NEXT:    [[J_NEXT_3:%.*]] = fadd double [[J_NEXT_2]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_4:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_3]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_3]], double* [[T0_4]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_4:%.*]] = or i64 [[I]], 5
; AUTO_VEC-NEXT:    [[J_NEXT_4:%.*]] = fadd double [[J_NEXT_3]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_5:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_4]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_4]], double* [[T0_5]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_5:%.*]] = or i64 [[I]], 6
; AUTO_VEC-NEXT:    [[J_NEXT_5:%.*]] = fadd double [[J_NEXT_4]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_6:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_5]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_5]], double* [[T0_6]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_6:%.*]] = or i64 [[I]], 7
; AUTO_VEC-NEXT:    [[J_NEXT_6:%.*]] = fadd double [[J_NEXT_5]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_7:%.*]] = getelementptr double, double* [[A]], i64 [[I_NEXT_6]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_6]], double* [[T0_7]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_7]] = add nuw nsw i64 [[I]], 8
; AUTO_VEC-NEXT:    [[J_NEXT_7]] = fadd double [[J_NEXT_6]], 3.000000e+00
; AUTO_VEC-NEXT:    [[NITER_NSUB_7]] = add i64 [[NITER]], -8
; AUTO_VEC-NEXT:    [[NITER_NCMP_7:%.*]] = icmp eq i64 [[NITER_NSUB_7]], 0
; AUTO_VEC-NEXT:    br i1 [[NITER_NCMP_7]], label [[FOR_END_UNR_LCSSA]], label [[FOR_BODY]]
; AUTO_VEC:       for.end.unr-lcssa:
; AUTO_VEC-NEXT:    [[J_LCSSA_PH:%.*]] = phi double [ undef, [[ENTRY:%.*]] ], [ [[J_NEXT_6]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[I_UNR:%.*]] = phi i64 [ 0, [[ENTRY]] ], [ [[I_NEXT_7]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[J_UNR:%.*]] = phi double [ 0.000000e+00, [[ENTRY]] ], [ [[J_NEXT_7]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[LCMP_MOD_NOT:%.*]] = icmp eq i64 [[XTRAITER]], 0
; AUTO_VEC-NEXT:    br i1 [[LCMP_MOD_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY_EPIL:%.*]]
; AUTO_VEC:       for.body.epil:
; AUTO_VEC-NEXT:    [[I_EPIL:%.*]] = phi i64 [ [[I_NEXT_EPIL:%.*]], [[FOR_BODY_EPIL]] ], [ [[I_UNR]], [[FOR_END_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[J_EPIL:%.*]] = phi double [ [[J_NEXT_EPIL:%.*]], [[FOR_BODY_EPIL]] ], [ [[J_UNR]], [[FOR_END_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[EPIL_ITER:%.*]] = phi i64 [ [[EPIL_ITER_SUB:%.*]], [[FOR_BODY_EPIL]] ], [ [[XTRAITER]], [[FOR_END_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[T0_EPIL:%.*]] = getelementptr double, double* [[A]], i64 [[I_EPIL]]
; AUTO_VEC-NEXT:    store double [[J_EPIL]], double* [[T0_EPIL]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_EPIL]] = add nuw nsw i64 [[I_EPIL]], 1
; AUTO_VEC-NEXT:    [[J_NEXT_EPIL]] = fadd double [[J_EPIL]], 3.000000e+00
; AUTO_VEC-NEXT:    [[EPIL_ITER_SUB]] = add i64 [[EPIL_ITER]], -1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_SUB]], 0
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[FOR_END]], label [[FOR_BODY_EPIL]], [[LOOP10:!llvm.loop !.*]]
; AUTO_VEC:       for.end:
; AUTO_VEC-NEXT:    [[J_LCSSA:%.*]] = phi double [ [[J_LCSSA_PH]], [[FOR_END_UNR_LCSSA]] ], [ [[J_EPIL]], [[FOR_BODY_EPIL]] ]
; AUTO_VEC-NEXT:    ret double [[J_LCSSA]]
;
entry:
  br label %for.body

for.body:
  %i = phi i64 [ 0, %entry ], [%i.next, %for.body]
  %j = phi double [ 0.0, %entry ], [ %j.next, %for.body ]
  %t0 = getelementptr double, double* %a, i64 %i
  store double %j, double* %t0
  %i.next = add i64 %i, 1
  %j.next = fadd double %j, 3.0
  %cond = icmp slt i64 %i.next, %n
  br i1 %cond, label %for.body, label %for.end

for.end:
  %t1 = phi double [ %j, %for.body ]
  ret double %t1
}

attributes #0 = { "no-nans-fp-math"="true" }
attributes #1 = { "no-nans-fp-math"="false" }