xref: /llvm-project/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis-early-exits.ll (revision e6a1657fa30c747f4412fc47f567660ebe861a9e)

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

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


declare void @use(ptr)
declare void @use.i1(i1)
declare void @llvm.assume(i1)
declare i1 @cond()

define void @test_monotonic_ptr_iv_inc_1_different_element_types_1_with_early_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_different_element_types_1_with_early_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, true
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i8, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i8, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_inc_2_different_element_types_1_with_early_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_2_different_element_types_1_with_early_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i8, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, [[T_2]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i8, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_inc_1_gep_step_size_i8_unknown_end_ptr_with_early_exit(ptr %start, ptr %end) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_gep_step_size_i8_unknown_end_ptr_with_early_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[START_ULT_END:%.*]] = icmp uge ptr [[START:%.*]], [[END:%.*]]
; CHECK-NEXT:    br i1 [[START_ULT_END]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[END]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, true
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i8, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %start.ult.end = icmp uge ptr %start, %end
  br i1 %start.ult.end, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %end
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %end
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i8, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_inc_1_gep_step_size_i32_unknown_end_ptr_with_early_exit(ptr %start, ptr %end) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_gep_step_size_i32_unknown_end_ptr_with_early_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[START_ULT_END:%.*]] = icmp uge ptr [[START:%.*]], [[END:%.*]]
; CHECK-NEXT:    br i1 [[START_ULT_END]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[END]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[END]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, [[T_2]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %start.ult.end = icmp uge ptr %start, %end
  br i1 %start.ult.end, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %end
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %end
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_inc_1_different_element_types_1_with_early_exit_and_different_upper(ptr %start, ptr %end, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_different_element_types_1_with_early_exit_and_different_upper(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[END:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    [[START_ULT_END:%.*]] = icmp ult ptr [[START:%.*]], [[UPPER]]
; CHECK-NEXT:    call void @llvm.assume(i1 [[START_ULT_END]])
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, [[T_2]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %end, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  %start.ult.end = icmp ult ptr %start, %upper
  call void @llvm.assume(i1 %start.ult.end)
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_step_sign_positive_through_assume_multi_exit(ptr %start, i16 %len, i16 %step) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_sign_positive_through_assume_multi_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STEP_POS:%.*]] = icmp sge i16 [[STEP:%.*]], 0
; CHECK-NEXT:    call void @llvm.assume(i1 [[STEP_POS]])
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[EXIT]]
; CHECK:       then:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 [[STEP]]
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %step.pos = icmp sge i16 %step, 0
  call void @llvm.assume(i1 %step.pos)
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %then, label %exit

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 %step
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_cond_doesnt_control_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_cond_doesnt_control_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %for.body

for.body:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %loop.latch

then:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_cond_doesnt_control_exit2(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_cond_doesnt_control_exit2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %for.body

for.body:
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %loop.latch

then:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_cond_doesnt_dominate_checks(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_cond_doesnt_dominate_checks(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %for.body

for.body:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %loop.latch

then:
  br label %loop.latch

loop.latch:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_step_2_multi_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_2_multi_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_1:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[THEN:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.1 = icmp eq ptr %ptr.iv, %upper
  br i1 %c.1, label %exit, label %for.body

for.body:
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %then

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_step_2_cond_doesnt_control_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_2_cond_doesnt_control_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 2
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %for.body

for.body:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %loop.latch

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 2
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_step_64_cond_doesnt_control_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_64_cond_doesnt_control_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i64, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i16, ptr [[PTR_IV]], i16 4
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i64, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %for.body

for.body:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %loop.latch

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i16, ptr %ptr.iv, i16 4
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_step_80_cond_doesnt_control_exit(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_step_80_cond_doesnt_control_exit(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i64, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[LOOP_LATCH]]
; CHECK:       then:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i16, ptr [[PTR_IV]], i16 5
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i64, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %for.body

for.body:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %loop.latch

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  br label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i16, ptr %ptr.iv, i16 5
  br label %loop.header

exit:
  ret void
}

define void @test_monotonic_ptr_iv_inc_1_check_outside_loop(ptr %start, i16 %len) {
; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_check_outside_loop(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp sge i16 [[LEN]], 0
; CHECK-NEXT:    call void @llvm.assume(i1 [[LEN_NEG]])
; CHECK-NEXT:    br label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C_0:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_0]], label [[EXIT:%.*]], label [[LOOP_LATCH]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds i32, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    [[C_1:%.*]] = icmp ne ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C_1]], label [[THEN:%.*]], label [[EXIT_2:%.*]]
; CHECK:       then:
; CHECK-NEXT:    [[C_2:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[C_3:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_2]], [[C_3]]
; CHECK-NEXT:    call void @use.i1(i1 [[AND]])
; CHECK-NEXT:    br label [[EXIT_2]]
; CHECK:       exit.2:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds i32, ptr %start, i16 %len
  %len.neg = icmp sge i16 %len, 0
  call void @llvm.assume(i1 %len.neg)
  br label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c.0 = call i1 @cond()
  br i1 %c.0, label %exit, label %loop.latch

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds i32, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  %c.1 = icmp ne ptr %ptr.iv, %upper
  br i1 %c.1, label %then, label %exit.2

then:
  %c.2 = icmp uge ptr %ptr.iv, %start
  %c.3 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %c.2, %c.3
  call void @use.i1(i1 %and)
  br label %exit.2

exit.2:
  ret void
}

define void @test_step_gep_doesnt_use_ptr_iv_phi(ptr %start, ptr %other, i16 %len) {
; CHECK-LABEL: @test_step_gep_doesnt_use_ptr_iv_phi(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds float, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds float, ptr [[OTHER:%.*]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds float, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds float, ptr %other, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_step_gep_not_inbounds(ptr %start, ptr %end, i16 %len) {
; CHECK-LABEL: @test_step_gep_not_inbounds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr inbounds float, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, true
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr float, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr inbounds float, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr float, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}

define void @test_upper_gep_not_inbounds(ptr %start, ptr %end, i16 %len) {
; CHECK-LABEL: @test_upper_gep_not_inbounds(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr float, ptr [[START:%.*]], i16 [[LEN:%.*]]
; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
; CHECK:       loop.ph:
; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
; CHECK:       loop.header:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP_NEXT:%.*]], label [[EXIT]]
; CHECK:       loop.next:
; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
; CHECK-NEXT:    [[AND:%.*]] = and i1 true, [[T_2]]
; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
; CHECK:       loop.latch:
; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr inbounds float, ptr [[PTR_IV]], i16 1
; CHECK-NEXT:    br label [[LOOP_HEADER]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %upper = getelementptr float, ptr %start, i16 %len
  %len.neg = icmp slt i16 %len, 0
  br i1 %len.neg, label %exit, label %loop.ph

loop.ph:
  br label %loop.header

loop.header:
  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
  %c = icmp eq ptr %ptr.iv, %upper
  br i1 %c, label %exit, label %for.body

for.body:
  %c.1 = call i1 @cond()
  br i1 %c.1, label %loop.next, label %exit

loop.next:
  %t.1 = icmp uge ptr %ptr.iv, %start
  %t.2 = icmp ult ptr %ptr.iv, %upper
  %and = and i1 %t.1, %t.2
  br i1 %and, label %loop.latch, label %exit

loop.latch:
  call void @use(ptr %ptr.iv)
  %ptr.iv.next = getelementptr inbounds float, ptr %ptr.iv, i16 1
  br label %loop.header

exit:
  ret void
}