; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes="default<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.
; FMF is required on the IR instructions.

;void fp_iv_loop1(ptr __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(ptr 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 nneg 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]], 2147483616
; AUTO_VEC-NEXT:    [[DOTCAST:%.*]] = sitofp i64 [[N_VEC]] to float
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = fmul fast float [[DOTCAST]], 5.000000e-01
; AUTO_VEC-NEXT:    [[IND_END:%.*]] = fadd fast float [[TMP0]], 1.000000e+00
; AUTO_VEC-NEXT:    br label [[VECTOR_BODY:%.*]]
; AUTO_VEC:       vector.body:
; AUTO_VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[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]] ], [ [[VEC_IND_NEXT:%.*]], [[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:    [[TMP1:%.*]] = getelementptr inbounds float, ptr [[A:%.*]], i64 [[INDEX]]
; AUTO_VEC-NEXT:    store <8 x float> [[VEC_IND]], ptr [[TMP1]], align 4
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i64 8
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD]], ptr [[TMP2]], align 4
; AUTO_VEC-NEXT:    [[TMP3:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i64 16
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD2]], ptr [[TMP3]], align 4
; AUTO_VEC-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i64 24
; AUTO_VEC-NEXT:    store <8 x float> [[STEP_ADD3]], ptr [[TMP4]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT]] = add nuw 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:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; AUTO_VEC-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; 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, ptr [[A]], i64 [[INDVARS_IV]]
; AUTO_VEC-NEXT:    store float [[X_06]], ptr [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[CONV1]] = fadd fast float [[X_06]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; AUTO_VEC-NEXT:    [[TMP6:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[ZEXT]]
; AUTO_VEC-NEXT:    br i1 [[TMP6]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
; 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, ptr %A, i64 %indvars.iv
  store float %x.06, ptr %arrayidx, align 4
  %conv1 = fadd fast 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, but FP operation has no FMF.
; Vectorization should be rejected.
;void fp_iv_loop2(ptr __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(ptr noalias nocapture %A, i32 %N) {
; 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 nneg i32 [[N]] to i64
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[ZEXT]], 7
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = icmp ult i32 [[N]], 8
; AUTO_VEC-NEXT:    br i1 [[TMP0]], 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]], 2147483640
; 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 [ 0, [[FOR_BODY_PREHEADER_NEW]] ], [ [[NITER_NEXT_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; AUTO_VEC-NEXT:    store float [[X_06]], ptr [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[CONV1:%.*]] = fadd float [[X_06]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT:%.*]] = or disjoint i64 [[INDVARS_IV]], 1
; AUTO_VEC-NEXT:    [[ARRAYIDX_1:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT]]
; AUTO_VEC-NEXT:    store float [[CONV1]], ptr [[ARRAYIDX_1]], align 4
; AUTO_VEC-NEXT:    [[CONV1_1:%.*]] = fadd float [[CONV1]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_1:%.*]] = or disjoint i64 [[INDVARS_IV]], 2
; AUTO_VEC-NEXT:    [[ARRAYIDX_2:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_1]]
; AUTO_VEC-NEXT:    store float [[CONV1_1]], ptr [[ARRAYIDX_2]], align 4
; AUTO_VEC-NEXT:    [[CONV1_2:%.*]] = fadd float [[CONV1_1]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_2:%.*]] = or disjoint i64 [[INDVARS_IV]], 3
; AUTO_VEC-NEXT:    [[ARRAYIDX_3:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_2]]
; AUTO_VEC-NEXT:    store float [[CONV1_2]], ptr [[ARRAYIDX_3]], align 4
; AUTO_VEC-NEXT:    [[CONV1_3:%.*]] = fadd float [[CONV1_2]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_3:%.*]] = or disjoint i64 [[INDVARS_IV]], 4
; AUTO_VEC-NEXT:    [[ARRAYIDX_4:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_3]]
; AUTO_VEC-NEXT:    store float [[CONV1_3]], ptr [[ARRAYIDX_4]], align 4
; AUTO_VEC-NEXT:    [[CONV1_4:%.*]] = fadd float [[CONV1_3]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_4:%.*]] = or disjoint i64 [[INDVARS_IV]], 5
; AUTO_VEC-NEXT:    [[ARRAYIDX_5:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_4]]
; AUTO_VEC-NEXT:    store float [[CONV1_4]], ptr [[ARRAYIDX_5]], align 4
; AUTO_VEC-NEXT:    [[CONV1_5:%.*]] = fadd float [[CONV1_4]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_5:%.*]] = or disjoint i64 [[INDVARS_IV]], 6
; AUTO_VEC-NEXT:    [[ARRAYIDX_6:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_5]]
; AUTO_VEC-NEXT:    store float [[CONV1_5]], ptr [[ARRAYIDX_6]], align 4
; AUTO_VEC-NEXT:    [[CONV1_6:%.*]] = fadd float [[CONV1_5]], 5.000000e-01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT_6:%.*]] = or disjoint i64 [[INDVARS_IV]], 7
; AUTO_VEC-NEXT:    [[ARRAYIDX_7:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_NEXT_6]]
; AUTO_VEC-NEXT:    store float [[CONV1_6]], ptr [[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_NEXT_7]] = add i64 [[NITER]], 8
; AUTO_VEC-NEXT:    [[NITER_NCMP_7:%.*]] = icmp eq i64 [[NITER_NEXT_7]], [[UNROLL_ITER]]
; 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_NEXT:%.*]], [[FOR_BODY_EPIL]] ], [ 0, [[FOR_END_LOOPEXIT_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX_EPIL:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV_EPIL]]
; AUTO_VEC-NEXT:    store float [[X_06_EPIL]], ptr [[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_NEXT]] = add i64 [[EPIL_ITER]], 1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_NEXT]], [[XTRAITER]]
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[FOR_END]], label [[FOR_BODY_EPIL]], !llvm.loop [[LOOP4:![0-9]+]]
; 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, ptr %A, i64 %indvars.iv
  store float %x.06, ptr %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(ptr %a, i64 %n) {
; AUTO_VEC-LABEL: @external_use_with_fast_math(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[SMAX:%.*]] = tail call i64 @llvm.smax.i64(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:    [[DOTCAST:%.*]] = sitofp i64 [[N_VEC]] to double
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = fmul fast double [[DOTCAST]], 3.000000e+00
; AUTO_VEC-NEXT:    br label [[VECTOR_BODY:%.*]]
; AUTO_VEC:       vector.body:
; AUTO_VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[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]] ], [ [[VEC_IND_NEXT:%.*]], [[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:    [[TMP1:%.*]] = getelementptr double, ptr [[A:%.*]], i64 [[INDEX]]
; AUTO_VEC-NEXT:    store <4 x double> [[VEC_IND]], ptr [[TMP1]], align 8
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = getelementptr double, ptr [[TMP1]], i64 4
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD]], ptr [[TMP2]], align 8
; AUTO_VEC-NEXT:    [[TMP3:%.*]] = getelementptr double, ptr [[TMP1]], i64 8
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD2]], ptr [[TMP3]], align 8
; AUTO_VEC-NEXT:    [[TMP4:%.*]] = getelementptr double, ptr [[TMP1]], i64 12
; AUTO_VEC-NEXT:    store <4 x double> [[STEP_ADD3]], ptr [[TMP4]], align 8
; AUTO_VEC-NEXT:    [[INDEX_NEXT]] = add nuw 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:    [[TMP5:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; AUTO_VEC-NEXT:    br i1 [[TMP5]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
; AUTO_VEC:       middle.block:
; AUTO_VEC-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[SMAX]], [[N_VEC]]
; AUTO_VEC-NEXT:    [[CMO:%.*]] = add nsw i64 [[N_VEC]], -1
; AUTO_VEC-NEXT:    [[DOTCAST6:%.*]] = sitofp i64 [[CMO]] to double
; AUTO_VEC-NEXT:    [[TMP6:%.*]] = fmul fast double [[DOTCAST6]], 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]] ], [ [[TMP0]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[T0:%.*]] = getelementptr double, ptr [[A]], i64 [[I]]
; AUTO_VEC-NEXT:    store double [[J]], ptr [[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]], !llvm.loop [[LOOP7:![0-9]+]]
; AUTO_VEC:       for.end:
; AUTO_VEC-NEXT:    [[J_LCSSA:%.*]] = phi double [ [[TMP6]], [[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, ptr %a, i64 %i
  store double %j, ptr %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(ptr %a, i64 %n) {
; AUTO_VEC-LABEL: @external_use_without_fast_math(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[SMAX:%.*]] = tail call i64 @llvm.smax.i64(i64 [[N:%.*]], i64 1)
; AUTO_VEC-NEXT:    [[XTRAITER:%.*]] = and i64 [[SMAX]], 7
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = icmp ult i64 [[SMAX]], 8
; AUTO_VEC-NEXT:    br i1 [[TMP0]], 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 [ 0, [[ENTRY_NEW]] ], [ [[NITER_NEXT_7:%.*]], [[FOR_BODY]] ]
; AUTO_VEC-NEXT:    [[T0:%.*]] = getelementptr double, ptr [[A:%.*]], i64 [[I]]
; AUTO_VEC-NEXT:    store double [[J]], ptr [[T0]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT:%.*]] = or disjoint i64 [[I]], 1
; AUTO_VEC-NEXT:    [[J_NEXT:%.*]] = fadd double [[J]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_1:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT]]
; AUTO_VEC-NEXT:    store double [[J_NEXT]], ptr [[T0_1]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_1:%.*]] = or disjoint i64 [[I]], 2
; AUTO_VEC-NEXT:    [[J_NEXT_1:%.*]] = fadd double [[J_NEXT]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_2:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_1]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_1]], ptr [[T0_2]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_2:%.*]] = or disjoint i64 [[I]], 3
; AUTO_VEC-NEXT:    [[J_NEXT_2:%.*]] = fadd double [[J_NEXT_1]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_3:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_2]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_2]], ptr [[T0_3]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_3:%.*]] = or disjoint i64 [[I]], 4
; AUTO_VEC-NEXT:    [[J_NEXT_3:%.*]] = fadd double [[J_NEXT_2]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_4:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_3]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_3]], ptr [[T0_4]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_4:%.*]] = or disjoint i64 [[I]], 5
; AUTO_VEC-NEXT:    [[J_NEXT_4:%.*]] = fadd double [[J_NEXT_3]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_5:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_4]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_4]], ptr [[T0_5]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_5:%.*]] = or disjoint i64 [[I]], 6
; AUTO_VEC-NEXT:    [[J_NEXT_5:%.*]] = fadd double [[J_NEXT_4]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_6:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_5]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_5]], ptr [[T0_6]], align 8
; AUTO_VEC-NEXT:    [[I_NEXT_6:%.*]] = or disjoint i64 [[I]], 7
; AUTO_VEC-NEXT:    [[J_NEXT_6:%.*]] = fadd double [[J_NEXT_5]], 3.000000e+00
; AUTO_VEC-NEXT:    [[T0_7:%.*]] = getelementptr double, ptr [[A]], i64 [[I_NEXT_6]]
; AUTO_VEC-NEXT:    store double [[J_NEXT_6]], ptr [[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_NEXT_7]] = add i64 [[NITER]], 8
; AUTO_VEC-NEXT:    [[NITER_NCMP_7:%.*]] = icmp eq i64 [[NITER_NEXT_7]], [[UNROLL_ITER]]
; 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_NEXT:%.*]], [[FOR_BODY_EPIL]] ], [ 0, [[FOR_END_UNR_LCSSA]] ]
; AUTO_VEC-NEXT:    [[T0_EPIL:%.*]] = getelementptr double, ptr [[A]], i64 [[I_EPIL]]
; AUTO_VEC-NEXT:    store double [[J_EPIL]], ptr [[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_NEXT]] = add i64 [[EPIL_ITER]], 1
; AUTO_VEC-NEXT:    [[EPIL_ITER_CMP_NOT:%.*]] = icmp eq i64 [[EPIL_ITER_NEXT]], [[XTRAITER]]
; AUTO_VEC-NEXT:    br i1 [[EPIL_ITER_CMP_NOT]], label [[FOR_END]], label [[FOR_BODY_EPIL]], !llvm.loop [[LOOP8:![0-9]+]]
; 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, ptr %a, i64 %i
  store double %j, ptr %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
}

;;  void fadd_induction(ptr p, unsigned N) {
;;    float x = 1.0f;
;;    for (unsigned i=0; i!=N; ++i) {
;;      p[i] = p[i] + x;
;;      x += 42.0f;
;;    }
;;  }

define void @fadd_reassoc_FMF(ptr nocapture %p, i32 %N) {
; AUTO_VEC-LABEL: @fadd_reassoc_FMF(
; AUTO_VEC-NEXT:  entry:
; AUTO_VEC-NEXT:    [[CMP_NOT11:%.*]] = icmp eq i32 [[N:%.*]], 0
; AUTO_VEC-NEXT:    br i1 [[CMP_NOT11]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; AUTO_VEC:       for.body.preheader:
; AUTO_VEC-NEXT:    [[TMP0:%.*]] = 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 [[TMP0]], 4294967264
; AUTO_VEC-NEXT:    [[DOTCAST:%.*]] = sitofp i64 [[N_VEC]] to float
; AUTO_VEC-NEXT:    [[TMP1:%.*]] = fmul reassoc float [[DOTCAST]], 4.200000e+01
; AUTO_VEC-NEXT:    [[IND_END:%.*]] = fadd reassoc float [[TMP1]], 1.000000e+00
; AUTO_VEC-NEXT:    br label [[VECTOR_BODY:%.*]]
; AUTO_VEC:       vector.body:
; AUTO_VEC-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[VEC_IND:%.*]] = phi <8 x float> [ <float 1.000000e+00, float 4.300000e+01, float 8.500000e+01, float 1.270000e+02, float 1.690000e+02, float 2.110000e+02, float 2.530000e+02, float 2.950000e+02>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ]
; AUTO_VEC-NEXT:    [[STEP_ADD:%.*]] = fadd reassoc <8 x float> [[VEC_IND]], <float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD2:%.*]] = fadd reassoc <8 x float> [[STEP_ADD]], <float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02>
; AUTO_VEC-NEXT:    [[STEP_ADD3:%.*]] = fadd reassoc <8 x float> [[STEP_ADD2]], <float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02>
; AUTO_VEC-NEXT:    [[TMP2:%.*]] = getelementptr inbounds float, ptr [[P:%.*]], i64 [[INDEX]]
; AUTO_VEC-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x float>, ptr [[TMP2]], align 4
; AUTO_VEC-NEXT:    [[TMP3:%.*]] = getelementptr inbounds float, ptr [[TMP2]], i64 8
; AUTO_VEC-NEXT:    [[WIDE_LOAD5:%.*]] = load <8 x float>, ptr [[TMP3]], align 4
; AUTO_VEC-NEXT:    [[TMP4:%.*]] = getelementptr inbounds float, ptr [[TMP2]], i64 16
; AUTO_VEC-NEXT:    [[WIDE_LOAD6:%.*]] = load <8 x float>, ptr [[TMP4]], align 4
; AUTO_VEC-NEXT:    [[TMP5:%.*]] = getelementptr inbounds float, ptr [[TMP2]], i64 24
; AUTO_VEC-NEXT:    [[WIDE_LOAD7:%.*]] = load <8 x float>, ptr [[TMP5]], align 4
; AUTO_VEC-NEXT:    [[TMP6:%.*]] = fadd reassoc <8 x float> [[VEC_IND]], [[WIDE_LOAD]]
; AUTO_VEC-NEXT:    [[TMP7:%.*]] = fadd reassoc <8 x float> [[STEP_ADD]], [[WIDE_LOAD5]]
; AUTO_VEC-NEXT:    [[TMP8:%.*]] = fadd reassoc <8 x float> [[STEP_ADD2]], [[WIDE_LOAD6]]
; AUTO_VEC-NEXT:    [[TMP9:%.*]] = fadd reassoc <8 x float> [[STEP_ADD3]], [[WIDE_LOAD7]]
; AUTO_VEC-NEXT:    store <8 x float> [[TMP6]], ptr [[TMP2]], align 4
; AUTO_VEC-NEXT:    store <8 x float> [[TMP7]], ptr [[TMP3]], align 4
; AUTO_VEC-NEXT:    store <8 x float> [[TMP8]], ptr [[TMP4]], align 4
; AUTO_VEC-NEXT:    store <8 x float> [[TMP9]], ptr [[TMP5]], align 4
; AUTO_VEC-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 32
; AUTO_VEC-NEXT:    [[VEC_IND_NEXT]] = fadd reassoc <8 x float> [[STEP_ADD3]], <float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02, float 3.360000e+02>
; AUTO_VEC-NEXT:    [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; AUTO_VEC-NEXT:    br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP9:![0-9]+]]
; AUTO_VEC:       middle.block:
; AUTO_VEC-NEXT:    [[CMP_N:%.*]] = icmp eq i64 [[N_VEC]], [[TMP0]]
; AUTO_VEC-NEXT:    br i1 [[CMP_N]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]]
; AUTO_VEC:       for.cond.cleanup:
; AUTO_VEC-NEXT:    ret void
; 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_012:%.*]] = phi float [ [[ADD3:%.*]], [[FOR_BODY]] ], [ 1.000000e+00, [[FOR_BODY_PREHEADER]] ], [ [[IND_END]], [[MIDDLE_BLOCK]] ]
; AUTO_VEC-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[P]], i64 [[INDVARS_IV]]
; AUTO_VEC-NEXT:    [[TMP11:%.*]] = load float, ptr [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[ADD:%.*]] = fadd reassoc float [[X_012]], [[TMP11]]
; AUTO_VEC-NEXT:    store float [[ADD]], ptr [[ARRAYIDX]], align 4
; AUTO_VEC-NEXT:    [[ADD3]] = fadd reassoc float [[X_012]], 4.200000e+01
; AUTO_VEC-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; AUTO_VEC-NEXT:    [[CMP_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[TMP0]]
; AUTO_VEC-NEXT:    br i1 [[CMP_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
;
entry:
  %cmp.not11 = icmp eq i32 %N, 0
  br i1 %cmp.not11, label %for.cond.cleanup, label %for.body.preheader

for.body.preheader:
  %0 = zext i32 %N to i64
  br label %for.body

for.cond.cleanup:
  ret void

for.body:
  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
  %x.012 = phi float [ 1.000000e+00, %for.body.preheader ], [ %add3, %for.body ]
  %arrayidx = getelementptr inbounds float, ptr %p, i64 %indvars.iv
  %1 = load float, ptr %arrayidx, align 4
  %add = fadd reassoc float %x.012, %1
  store float %add, ptr %arrayidx, align 4
  %add3 = fadd reassoc float %x.012, 4.200000e+01
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %cmp.not = icmp eq i64 %indvars.iv.next, %0
  br i1 %cmp.not, label %for.cond.cleanup, label %for.body
}