xref: /llvm-project/llvm/test/Transforms/ConstraintElimination/gep-arithmetic-add-signed-predicates.ll (revision 6b1396e31fb57795b3e2007a0345e0859f01fd99)

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s

declare void @llvm.assume(i1 noundef) #0

define i1 @n_unknown(ptr %dst, i32 %n, i32 %i) {
; CHECK-LABEL: @n_unknown(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SUB:%.*]] = add i32 [[N:%.*]], -1
; CHECK-NEXT:    [[IDXPROM:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[PTR_N_SUB_1:%.*]] = getelementptr i32, ptr [[DST:%.*]], i64 [[IDXPROM]]
; CHECK-NEXT:    [[CMP_PTR_DST:%.*]] = icmp sge ptr [[PTR_N_SUB_1]], [[DST]]
; CHECK-NEXT:    br i1 [[CMP_PTR_DST]], label [[PRE_BB_2:%.*]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i1 false
; CHECK:       pre.bb.2:
; CHECK-NEXT:    [[PRE_2:%.*]] = icmp sge i32 [[I:%.*]], 0
; CHECK-NEXT:    br i1 [[PRE_2]], label [[TGT_BB:%.*]], label [[EXIT]]
; CHECK:       tgt.bb:
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i32 [[I]], [[N]]
; CHECK-NEXT:    ret i1 [[CMP1]]
;
entry:
  %sub = add i32 %n, -1
  %idxprom = zext i32 %sub to i64
  %ptr.n.sub.1 = getelementptr i32, ptr %dst, i64 %idxprom
  %cmp.ptr.dst = icmp sge ptr %ptr.n.sub.1, %dst
  br i1 %cmp.ptr.dst, label %pre.bb.2, label %exit

exit:
  ret i1 false

pre.bb.2:
  %pre.2 = icmp sge i32 %i, 0
  br i1 %pre.2, label %tgt.bb, label %exit

tgt.bb:
  %cmp1 = icmp slt i32 %i, %n
  ret i1 %cmp1
}

define i1 @n_known_zero_due_to_nuw(ptr %dst, i32 %n, i32 %i) {
; CHECK-LABEL: @n_known_zero_due_to_nuw(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SUB:%.*]] = add i32 [[N:%.*]], -1
; CHECK-NEXT:    [[IDXPROM:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[PTR_N_SUB_1:%.*]] = getelementptr i32, ptr [[DST:%.*]], i64 [[IDXPROM]]
; CHECK-NEXT:    [[CMP_PTR_DST:%.*]] = icmp sge ptr [[PTR_N_SUB_1]], [[DST]]
; CHECK-NEXT:    br i1 [[CMP_PTR_DST]], label [[PRE_BB_2:%.*]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i1 false
; CHECK:       pre.bb.2:
; CHECK-NEXT:    [[PRE_2:%.*]] = icmp sge i32 [[I:%.*]], 0
; CHECK-NEXT:    br i1 [[PRE_2]], label [[TGT_BB:%.*]], label [[EXIT]]
; CHECK:       tgt.bb:
; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i32 [[I]], [[N]]
; CHECK-NEXT:    ret i1 [[CMP1]]
;
entry:
  %sub = add i32 %n, -1
  %idxprom = zext i32 %sub to i64
  %ptr.n.sub.1 = getelementptr i32, ptr %dst, i64 %idxprom
  %cmp.ptr.dst = icmp sge ptr %ptr.n.sub.1, %dst
  br i1 %cmp.ptr.dst, label %pre.bb.2, label %exit

exit:
  ret i1 false

pre.bb.2:
  %pre.2 = icmp sge i32 %i, 0
  br i1 %pre.2, label %tgt.bb, label %exit

tgt.bb:
  %cmp1 = icmp slt i32 %i, %n
  ret i1 %cmp1
}

define i4 @inc_ptr_N_could_be_negative(ptr %src, ptr %lower, ptr %upper, i8 %N, i8 %step) {
; CHECK-LABEL: @inc_ptr_N_could_be_negative(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i8 [[N:%.*]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT:    [[CMP_SRC_END:%.*]] = icmp sge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT:    [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT:    br i1 [[OR_PRECOND_0]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[STEP_POS:%.*]] = icmp sge i8 [[STEP:%.*]], 0
; CHECK-NEXT:    [[NEXT:%.*]] = add nuw nsw i8 [[STEP]], 2
; CHECK-NEXT:    [[STEP_SLT_N:%.*]] = icmp slt i8 [[NEXT]], [[N]]
; CHECK-NEXT:    [[AND_STEP:%.*]] = and i1 [[STEP_POS]], [[STEP_SLT_N]]
; CHECK-NEXT:    br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK:       ptr.check:
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i8 [[STEP]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry:
  %src.end = getelementptr inbounds i8, ptr %src, i8 %N
  %cmp.src.start = icmp slt ptr %src, %lower
  %cmp.src.end = icmp sge ptr %src.end, %upper
  %or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
  br i1 %or.precond.0, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %step.pos = icmp sge i8 %step, 0
  %next = add nuw nsw i8 %step, 2
  %step.slt.N = icmp slt i8 %next, %N
  %and.step = and i1 %step.pos, %step.slt.N
  br i1 %and.step, label %ptr.check, label %exit

ptr.check:
  %src.step = getelementptr inbounds i8, ptr %src, i8 %step
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}

define i4 @inc_ptr_src_sge_end(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @inc_ptr_src_sge_end(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N:%.*]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT:    [[CMP_SRC_END:%.*]] = icmp sge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT:    [[CMP_OVERFLOW:%.*]] = icmp sgt ptr [[SRC]], [[SRC_END]]
; CHECK-NEXT:    [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT:    [[OR_PRECOND_1:%.*]] = or i1 [[OR_PRECOND_0]], [[CMP_OVERFLOW]]
; CHECK-NEXT:    br i1 [[OR_PRECOND_1]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[STEP_POS:%.*]] = icmp sge i16 [[STEP:%.*]], 0
; CHECK-NEXT:    [[NEXT:%.*]] = add nuw nsw i16 [[STEP]], 2
; CHECK-NEXT:    [[STEP_SLT_N:%.*]] = icmp slt i16 [[NEXT]], [[N]]
; CHECK-NEXT:    [[AND_STEP:%.*]] = and i1 [[STEP_POS]], [[STEP_SLT_N]]
; CHECK-NEXT:    br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK:       ptr.check:
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[STEP]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry:
  %src.end = getelementptr inbounds i8, ptr %src, i16 %N
  %cmp.src.start = icmp slt ptr %src, %lower
  %cmp.src.end = icmp sge ptr %src.end, %upper
  %cmp.overflow = icmp sgt ptr %src, %src.end
  %or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
  %or.precond.1 = or i1 %or.precond.0, %cmp.overflow
  br i1 %or.precond.1, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %step.pos = icmp sge i16 %step, 0
  %next = add nuw nsw i16 %step, 2
  %step.slt.N = icmp slt i16 %next, %N
  %and.step = and i1 %step.pos, %step.slt.N
  br i1 %and.step, label %ptr.check, label %exit

ptr.check:
  %src.step = getelementptr inbounds i8, ptr %src, i16 %step
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}

define i4 @inc_ptr_src_sge_end_no_nsw_add(ptr %src, ptr %lower, ptr %upper, i16 %idx, i16 %N, i16 %step) {
; CHECK-LABEL: @inc_ptr_src_sge_end_no_nsw_add(
; CHECK-NEXT:  entry.1:
; CHECK-NEXT:    [[IDX_POS:%.*]] = icmp sge i16 [[IDX:%.*]], 0
; CHECK-NEXT:    br i1 [[IDX_POS]], label [[ENTRY:%.*]], label [[TRAP_BB:%.*]]
; CHECK:       entry:
; CHECK-NEXT:    [[SRC_IDX:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[IDX]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC_IDX]], [[LOWER:%.*]]
; CHECK-NEXT:    br i1 [[CMP_SRC_START]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[NEXT:%.*]] = add i16 [[IDX]], 2
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[NEXT]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER:%.*]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry.1:
  %idx.pos = icmp sge i16 %idx, 0
  br i1 %idx.pos, label %entry, label %trap.bb

entry:
  %src.idx = getelementptr inbounds i8, ptr %src, i16 %idx
  %cmp.src.start = icmp slt ptr %src.idx, %lower
  br i1 %cmp.src.start, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %next = add i16 %idx, 2
  %src.step = getelementptr inbounds i8, ptr %src, i16 %next
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}

define i4 @inc_ptr_src_sge_end_no_nsw_add_sge_0(ptr %src, ptr %lower, ptr %upper, i16 %idx, i16 %N, i16 %step) {
; CHECK-LABEL: @inc_ptr_src_sge_end_no_nsw_add_sge_0(
; CHECK-NEXT:  entry.1:
; CHECK-NEXT:    [[IDX_POS:%.*]] = icmp sge i16 [[IDX:%.*]], 0
; CHECK-NEXT:    br i1 [[IDX_POS]], label [[ENTRY:%.*]], label [[TRAP_BB:%.*]]
; CHECK:       entry:
; CHECK-NEXT:    [[SRC_IDX:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[IDX]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC_IDX]], [[LOWER:%.*]]
; CHECK-NEXT:    br i1 [[CMP_SRC_START]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[NEXT:%.*]] = add i16 [[IDX]], 2
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[NEXT]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER:%.*]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry.1:
  %idx.pos = icmp sge i16 %idx, 0
  br i1 %idx.pos, label %entry, label %trap.bb

entry:
  %src.idx = getelementptr inbounds i8, ptr %src, i16 %idx
  %cmp.src.start = icmp slt ptr %src.idx, %lower
  br i1 %cmp.src.start, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %next = add i16 %idx, 2
  %src.step = getelementptr inbounds i8, ptr %src, i16 %next
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}
define i4 @ptr_N_step_zext_n_zext(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_step_zext_n_zext(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[N_ADD_1:%.*]] = add nuw nsw i16 [[N:%.*]], 1
; CHECK-NEXT:    [[N_ADD_1_EXT:%.*]] = zext i16 [[N_ADD_1]] to i32
; CHECK-NEXT:    [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i32 [[N_ADD_1_EXT]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT:    [[CMP_SRC_END:%.*]] = icmp sge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT:    [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT:    br i1 [[OR_PRECOND_0]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[STEP_ADD_1:%.*]] = add nuw nsw i16 [[STEP:%.*]], 1
; CHECK-NEXT:    [[STEP_ADD_1_EXT:%.*]] = zext i16 [[STEP_ADD_1]] to i32
; CHECK-NEXT:    [[STEP_SLT_N:%.*]] = icmp slt i32 [[STEP_ADD_1_EXT]], [[N_ADD_1_EXT]]
; CHECK-NEXT:    br i1 [[STEP_SLT_N]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK:       ptr.check:
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i32 [[STEP_ADD_1_EXT]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry:
  %N.add.1 = add nuw nsw i16 %N, 1
  %N.add.1.ext = zext i16 %N.add.1 to i32
  %src.end = getelementptr inbounds i8, ptr %src, i32 %N.add.1.ext
  %cmp.src.start = icmp slt ptr %src, %lower
  %cmp.src.end = icmp sge ptr %src.end, %upper
  %or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
  br i1 %or.precond.0, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %step.add.1 = add nuw nsw i16 %step, 1
  %step.add.1.ext = zext i16 %step.add.1 to i32
  %step.slt.N = icmp slt i32 %step.add.1.ext, %N.add.1.ext
  br i1 %step.slt.N, label %ptr.check, label %exit

ptr.check:
  %src.step = getelementptr inbounds i8, ptr %src, i32 %step.add.1.ext
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}

define i4 @ptr_N_step_zext_n_zext_out_of_bounds(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_step_zext_n_zext_out_of_bounds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[N_ADD_2:%.*]] = add nuw nsw i16 [[N:%.*]], 2
; CHECK-NEXT:    [[N_ADD_2_EXT:%.*]] = zext i16 [[N_ADD_2]] to i32
; CHECK-NEXT:    [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i32 [[N_ADD_2_EXT]]
; CHECK-NEXT:    [[CMP_SRC_START:%.*]] = icmp slt ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT:    [[CMP_SRC_END:%.*]] = icmp sge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT:    [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT:    br i1 [[OR_PRECOND_0]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK:       trap.bb:
; CHECK-NEXT:    ret i4 2
; CHECK:       step.check:
; CHECK-NEXT:    [[STEP_ADD_2:%.*]] = add nuw nsw i16 [[STEP:%.*]], 2
; CHECK-NEXT:    [[STEP_ADD_2_EXT:%.*]] = zext i16 [[STEP_ADD_2]] to i32
; CHECK-NEXT:    [[STEP_EXT:%.*]] = zext i16 [[STEP]] to i32
; CHECK-NEXT:    [[STEP_SLT_N:%.*]] = icmp slt i32 [[STEP_EXT]], [[N_ADD_2_EXT]]
; CHECK-NEXT:    br i1 [[STEP_SLT_N]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK:       ptr.check:
; CHECK-NEXT:    [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i32 [[STEP_ADD_2_EXT]]
; CHECK-NEXT:    [[CMP_STEP_START:%.*]] = icmp slt ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT:    [[CMP_STEP_END:%.*]] = icmp sge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT:    [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT:    br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret i4 3
;
entry:
  %N.add.2 = add nuw nsw i16 %N, 2
  %N.add.2.ext = zext i16 %N.add.2 to i32
  %src.end = getelementptr inbounds i8, ptr %src, i32 %N.add.2.ext
  %cmp.src.start = icmp slt ptr %src, %lower
  %cmp.src.end = icmp sge ptr %src.end, %upper
  %or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
  br i1 %or.precond.0, label %trap.bb, label %step.check

trap.bb:
  ret i4 2

step.check:
  %step.add.2 = add nuw nsw i16 %step, 2
  %step.add.2.ext = zext i16 %step.add.2 to i32
  %step.ext = zext i16 %step to i32
  %step.slt.N = icmp slt i32 %step.ext, %N.add.2.ext
  br i1 %step.slt.N, label %ptr.check, label %exit

ptr.check:
  %src.step = getelementptr inbounds i8, ptr %src, i32 %step.add.2.ext
  %cmp.step.start = icmp slt ptr %src.step, %lower
  %cmp.step.end = icmp sge ptr %src.step, %upper
  %or.check = or i1 %cmp.step.start, %cmp.step.end
  br i1 %or.check, label %trap.bb, label %exit

exit:
  ret i4 3
}

define i1 @gep_count_add_1_sge_known_slt_1(i32 %count, ptr %p) {
; CHECK-LABEL: @gep_count_add_1_sge_known_slt_1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SGE:%.*]] = icmp sge i32 [[COUNT:%.*]], 1
; CHECK-NEXT:    call void @llvm.assume(i1 [[SGE]])
; CHECK-NEXT:    [[COUNT_EXT:%.*]] = zext i32 [[COUNT]] to i64
; CHECK-NEXT:    [[GEP_COUNT:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 [[COUNT_EXT]]
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[COUNT]], -1
; CHECK-NEXT:    [[SUB_EXT:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[GEP_SUB:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[SUB_EXT]]
; CHECK-NEXT:    [[C:%.*]] = icmp slt ptr [[GEP_SUB]], [[GEP_COUNT]]
; CHECK-NEXT:    ret i1 [[C]]
;
entry:
  %sge = icmp sge i32 %count, 1
  call void @llvm.assume(i1 %sge)
  %count.ext = zext i32 %count to i64
  %gep.count = getelementptr inbounds i32, ptr %p, i64 %count.ext
  %sub = add nsw i32 %count, -1
  %sub.ext = zext i32 %sub to i64
  %gep.sub = getelementptr inbounds i32, ptr %p, i64 %sub.ext
  %c = icmp slt ptr %gep.sub, %gep.count
  ;%2 = icmp sge ptr %0, %p
  ret i1 %c
}

define i1 @gep_count_add_1_sge_known_sge_1(i32 %count, ptr %p) {
; CHECK-LABEL: @gep_count_add_1_sge_known_sge_1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SGE:%.*]] = icmp sge i32 [[COUNT:%.*]], 1
; CHECK-NEXT:    call void @llvm.assume(i1 [[SGE]])
; CHECK-NEXT:    [[COUNT_EXT:%.*]] = zext i32 [[COUNT]] to i64
; CHECK-NEXT:    [[GEP_COUNT:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 [[COUNT_EXT]]
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[COUNT]], -1
; CHECK-NEXT:    [[SUB_EXT:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[GEP_SUB:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[SUB_EXT]]
; CHECK-NEXT:    [[C:%.*]] = icmp sge ptr [[GEP_SUB]], [[P]]
; CHECK-NEXT:    ret i1 [[C]]
;
entry:
  %sge = icmp sge i32 %count, 1
  call void @llvm.assume(i1 %sge)
  %count.ext = zext i32 %count to i64
  %gep.count = getelementptr inbounds i32, ptr %p, i64 %count.ext
  %sub = add nsw i32 %count, -1
  %sub.ext = zext i32 %sub to i64
  %gep.sub = getelementptr inbounds i32, ptr %p, i64 %sub.ext
  %c = icmp sge ptr %gep.sub, %p
  ret i1 %c
}

define i1 @gep_count_add_2_sge_not_known_slt_1(i32 %count, ptr %p) {
; CHECK-LABEL: @gep_count_add_2_sge_not_known_slt_1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SGE:%.*]] = icmp sge i32 [[COUNT:%.*]], 1
; CHECK-NEXT:    call void @llvm.assume(i1 [[SGE]])
; CHECK-NEXT:    [[COUNT_EXT:%.*]] = zext i32 [[COUNT]] to i64
; CHECK-NEXT:    [[GEP_COUNT:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 [[COUNT_EXT]]
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[COUNT]], -2
; CHECK-NEXT:    [[SUB_EXT:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[GEP_SUB:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[SUB_EXT]]
; CHECK-NEXT:    [[C:%.*]] = icmp slt ptr [[GEP_SUB]], [[GEP_COUNT]]
; CHECK-NEXT:    ret i1 [[C]]
;
entry:
  %sge = icmp sge i32 %count, 1
  call void @llvm.assume(i1 %sge)
  %count.ext = zext i32 %count to i64
  %gep.count = getelementptr inbounds i32, ptr %p, i64 %count.ext
  %sub = add nsw i32 %count, -2
  %sub.ext = zext i32 %sub to i64
  %gep.sub = getelementptr inbounds i32, ptr %p, i64 %sub.ext
  %c = icmp slt ptr %gep.sub, %gep.count
  ret i1 %c
}

define i1 @gep_count_add_2_sge_not_known_sge_1(i32 %count, ptr %p) {
; CHECK-LABEL: @gep_count_add_2_sge_not_known_sge_1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[SGE:%.*]] = icmp sge i32 [[COUNT:%.*]], 1
; CHECK-NEXT:    call void @llvm.assume(i1 [[SGE]])
; CHECK-NEXT:    [[COUNT_EXT:%.*]] = zext i32 [[COUNT]] to i64
; CHECK-NEXT:    [[GEP_COUNT:%.*]] = getelementptr inbounds i32, ptr [[P:%.*]], i64 [[COUNT_EXT]]
; CHECK-NEXT:    [[SUB:%.*]] = add nsw i32 [[COUNT]], -2
; CHECK-NEXT:    [[SUB_EXT:%.*]] = zext i32 [[SUB]] to i64
; CHECK-NEXT:    [[GEP_SUB:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[SUB_EXT]]
; CHECK-NEXT:    [[C:%.*]] = icmp sge ptr [[GEP_SUB]], [[P]]
; CHECK-NEXT:    ret i1 [[C]]
;
entry:
  %sge = icmp sge i32 %count, 1
  call void @llvm.assume(i1 %sge)
  %count.ext = zext i32 %count to i64
  %gep.count = getelementptr inbounds i32, ptr %p, i64 %count.ext
  %sub = add nsw i32 %count, -2
  %sub.ext = zext i32 %sub to i64
  %gep.sub = getelementptr inbounds i32, ptr %p, i64 %sub.ext
  %c = icmp sge ptr %gep.sub, %p
  ret i1 %c
}