test/Instrumentation/PoisonChecking/ub-checks.ll

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

; This file contains tests to exercise the UB triggering instructions with
; a potential source of UB.  The UB source is kept simple; we focus on the
; UB triggering instructions here.

define void @store(ptr %base, i32 %a) {
; CHECK-LABEL: @store(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[A]], 1
; CHECK-NEXT:    [[P:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i32 [[ADD]]
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    store i8 0, ptr [[P]], align 1
; CHECK-NEXT:    ret void
;
  %add = add nsw i32 %a, 1
  %p = getelementptr i8, ptr %base, i32 %add
  store i8 0, ptr %p
  ret void
}

define void @load(ptr %base, i32 %a) {
; CHECK-LABEL: @load(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[A]], 1
; CHECK-NEXT:    [[P:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i32 [[ADD]]
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[TMP4:%.*]] = load volatile i8, ptr [[P]], align 1
; CHECK-NEXT:    ret void
;
  %add = add nsw i32 %a, 1
  %p = getelementptr i8, ptr %base, i32 %add
  load volatile i8, ptr %p
  ret void
}

define void @atomicrmw(ptr %base, i32 %a) {
; CHECK-LABEL: @atomicrmw(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[A]], 1
; CHECK-NEXT:    [[P:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i32 [[ADD]]
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[TMP4:%.*]] = atomicrmw add ptr [[P]], i8 1 seq_cst, align 1
; CHECK-NEXT:    ret void
;
  %add = add nsw i32 %a, 1
  %p = getelementptr i8, ptr %base, i32 %add
  atomicrmw add ptr %p, i8 1 seq_cst
  ret void
}

define void @cmpxchg(ptr %base, i32 %a) {
; CHECK-LABEL: @cmpxchg(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[A]], 1
; CHECK-NEXT:    [[P:%.*]] = getelementptr i8, ptr [[BASE:%.*]], i32 [[ADD]]
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[TMP4:%.*]] = cmpxchg ptr [[P]], i8 1, i8 0 seq_cst seq_cst, align 1
; CHECK-NEXT:    ret void
;
  %add = add nsw i32 %a, 1
  %p = getelementptr i8, ptr %base, i32 %add
  cmpxchg ptr %p, i8 1, i8 0 seq_cst seq_cst
  ret void
}

define i32 @udiv(ptr %base, i32 %a) {
; CHECK-LABEL: @udiv(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[RES:%.*]] = udiv i32 2048, [[ADD]]
; CHECK-NEXT:    ret i32 [[RES]]
;
  %add = add nuw i32 %a, 1
  %res = udiv i32 2048, %add
  ret i32 %res
}

define i32 @sdiv(ptr %base, i32 %a) {
; CHECK-LABEL: @sdiv(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[RES:%.*]] = sdiv i32 2048, [[ADD]]
; CHECK-NEXT:    ret i32 [[RES]]
;
  %add = add nuw i32 %a, 1
  %res = sdiv i32 2048, %add
  ret i32 %res
}

define i32 @urem(ptr %base, i32 %a) {
; CHECK-LABEL: @urem(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[RES:%.*]] = urem i32 2048, [[ADD]]
; CHECK-NEXT:    ret i32 [[RES]]
;
  %add = add nuw i32 %a, 1
  %res = urem i32 2048, %add
  ret i32 %res
}

define i32 @srem(ptr %base, i32 %a) {
; CHECK-LABEL: @srem(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    [[RES:%.*]] = srem i32 2048, [[ADD]]
; CHECK-NEXT:    ret i32 [[RES]]
;
  %add = add nuw i32 %a, 1
  %res = srem i32 2048, %add
  ret i32 %res
}

define noundef i32 @select_cond_may_be_poison(i32 %a, i32 %b) {
; CHECK-LABEL: @select_cond_may_be_poison(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[T:%.*]] = trunc i32 [[ADD]] to i1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[T]], i32 [[ADD]], i32 [[B:%.*]]
; CHECK-NEXT:    [[TMP3:%.*]] = xor i1 [[TMP2]], true
; CHECK-NEXT:    call void @__poison_checker_assert(i1 [[TMP3]])
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %add = add nuw i32 %a, 1
  %t = trunc i32 %add to i1
  %sel = select i1 %t, i32 %add, i32 %b
  ret i32 %sel
}

define noundef i32 @select_cond_true_third_op_may_be_poison(i32 %a, i32 %b) {
; CHECK-LABEL: @select_cond_true_third_op_may_be_poison(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 true, i32 [[B:%.*]], i32 [[ADD]]
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %add = add nuw i32 %a, 1
  %sel = select i1 true, i32 %b, i32 %add
  ret i32 %sel
}

define noundef i32 @select_cond_false_second_op_may_be_poison(i1 %c, i32 %a, i32 %b) {
; CHECK-LABEL: @select_cond_false_second_op_may_be_poison(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 false, i32 [[ADD]], i32 [[B:%.*]]
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %add = add nuw i32 %a, 1
  %sel = select i1 false, i32 %add, i32 %b
  ret i32 %sel
}

define noundef i32 @select_unknown_true_third_op_may_be_poison(i1 %c, i32 %a, i32 %b) {
; CHECK-LABEL: @select_unknown_true_third_op_may_be_poison(
; CHECK-NEXT:    [[TMP1:%.*]] = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 [[A:%.*]], i32 1)
; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { i32, i1 } [[TMP1]], 1
; CHECK-NEXT:    [[ADD:%.*]] = add nuw i32 [[A]], 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[C:%.*]], i32 [[B:%.*]], i32 [[ADD]]
; CHECK-NEXT:    ret i32 [[SEL]]
;
  %add = add nuw i32 %a, 1
  %sel = select i1 %c, i32 %b, i32 %add
  ret i32 %sel
}