llvm/test/Transforms/IndVarSimplify/widen-nonnegative-countdown.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes='indvars' -verify-loop-info -verify-dom-info -verify-scev | FileCheck %s

target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"

; This file covers proving non-negative IVs for IV widening on common
; count down loop structures.  Count down loops are tricky to prove
; non-negative for since we canonicalize a sub to add, and loose the
; sub nuw fact.

; use(a[i]) loops
; -------------------------------------------------------------------

define void @zext_postinc_constant_start(ptr %A) {
; CHECK-LABEL: @zext_postinc_constant_start(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = zext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc_constant_start(ptr %A) {
; CHECK-LABEL: @zext_preinc_constant_start(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = zext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @zext_postinc(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_postinc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[J_016_US:%.*]] = phi i32 [ [[INC_US:%.*]], [[FOR_BODY]] ], [ [[START]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INC_US]] = add nsw i32 [[J_016_US]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[INC_US]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = zext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_preinc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = zext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc_constant_start(ptr %A) {
; CHECK-LABEL: @sext_postinc_constant_start(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = sext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc_constant_start(ptr %A) {
; CHECK-LABEL: @sext_preinc_constant_start(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = sext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_postinc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP1]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = sext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_preinc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP1]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %idxprom.us = sext i32 %j.016.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

; use(a[i + 1]) loops
; -------------------------------------------------------------------

define void @zext_postinc_constant_start_offset_constant_one(ptr %A) {
; CHECK-LABEL: @zext_postinc_constant_start_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc_constant_start_offset_constant_one(ptr %A) {
; CHECK-LABEL: @zext_preinc_constant_start_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @zext_postinc_offset_constant_one(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_postinc_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[J_016_US:%.*]] = phi i32 [ [[INC_US:%.*]], [[FOR_BODY]] ], [ [[START]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nuw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[ADD_US:%.*]] = add i32 [[TMP1]], 1
; CHECK-NEXT:    [[IDXPROM_US:%.*]] = zext i32 [[ADD_US]] to i64
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IDXPROM_US]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INC_US]] = add nsw i32 [[J_016_US]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[INC_US]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc_offset_constant_one(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_preinc_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP1]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc_constant_start_offset_constant_one(ptr %A) {
; CHECK-LABEL: @sext_postinc_constant_start_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc_constant_start_offset_constant_one(ptr %A) {
; CHECK-LABEL: @sext_preinc_constant_start_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc_offset_constant_one(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_postinc_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[ADD_US:%.*]] = add i32 [[TMP1]], 1
; CHECK-NEXT:    [[IDXPROM_US:%.*]] = sext i32 [[ADD_US]] to i64
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IDXPROM_US]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = trunc nsw i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP2]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc_offset_constant_one(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_preinc_offset_constant_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[ADD_US:%.*]] = add nuw i32 [[TMP1]], 1
; CHECK-NEXT:    [[IDXPROM_US:%.*]] = sext i32 [[ADD_US]] to i64
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IDXPROM_US]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP2]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, 1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

; use(a[i - 1]) loops
; -------------------------------------------------------------------

define void @zext_postinc_constant_start_offset_constant_minus_one(ptr %A) {
; CHECK-LABEL: @zext_postinc_constant_start_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc_constant_start_offset_constant_minus_one(ptr %A) {
; CHECK-LABEL: @zext_preinc_constant_start_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @zext_postinc_offset_constant_minus_one(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_postinc_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[J_016_US:%.*]] = phi i32 [ [[INC_US:%.*]], [[FOR_BODY]] ], [ [[START]], [[FOR_BODY_PREHEADER]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP1]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INC_US]] = add nsw i32 [[J_016_US]], -1
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[INC_US]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @zext_preinc_offset_constant_minus_one(ptr %A, i32 %start) {
; CHECK-LABEL: @zext_preinc_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = zext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[TMP1]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = zext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc_constant_start_offset_constant_minus_one(ptr %A) {
; CHECK-LABEL: @sext_postinc_constant_start_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV_NEXT]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc_constant_start_offset_constant_minus_one(ptr %A) {
; CHECK-LABEL: @sext_preinc_constant_start_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ], [ 1024, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[INDVARS_IV_NEXT]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i64 [[INDVARS_IV]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %for.body

for.body:
  %j.016.us = phi i32 [ 1024, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

define void @sext_postinc_offset_constant_minus_one(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_postinc_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[ADD_US:%.*]] = add i32 [[TMP1]], -1
; CHECK-NEXT:    [[IDXPROM_US:%.*]] = sext i32 [[ADD_US]] to i64
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IDXPROM_US]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = trunc nsw i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP2]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %inc.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}


define void @sext_preinc_offset_constant_minus_one(ptr %A, i32 %start) {
; CHECK-LABEL: @sext_preinc_offset_constant_minus_one(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[NONPOS:%.*]] = icmp slt i32 [[START:%.*]], 2
; CHECK-NEXT:    br i1 [[NONPOS]], label [[EXIT:%.*]], label [[FOR_BODY_PREHEADER:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[TMP0]], [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[TMP1:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[ADD_US:%.*]] = add i32 [[TMP1]], -1
; CHECK-NEXT:    [[IDXPROM_US:%.*]] = sext i32 [[ADD_US]] to i64
; CHECK-NEXT:    [[ARRAYIDX_US:%.*]] = getelementptr inbounds i32, ptr [[A:%.*]], i64 [[IDXPROM_US]]
; CHECK-NEXT:    tail call void @use_ptr(ptr [[ARRAYIDX_US]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = trunc nsw i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    [[CMP2_US:%.*]] = icmp ugt i32 [[TMP2]], 6
; CHECK-NEXT:    br i1 [[CMP2_US]], label [[FOR_BODY]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK:       exit.loopexit:
; CHECK-NEXT:    br label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %nonpos = icmp slt i32 %start, 2
  br i1 %nonpos, label %exit, label %for.body

for.body:
  %j.016.us = phi i32 [ %start, %entry ], [ %inc.us, %for.body ]
  %add.us = add i32 %j.016.us, -1
  %idxprom.us = sext i32 %add.us to i64
  %arrayidx.us = getelementptr inbounds i32, ptr %A, i64 %idxprom.us
  tail call void @use_ptr(ptr %arrayidx.us)
  %inc.us = add nsw i32 %j.016.us, -1
  %cmp2.us = icmp ugt i32 %j.016.us, 6
  br i1 %cmp2.us, label %for.body, label %exit

exit:
  ret void
}

declare dso_local void @use_ptr(ptr %0)