File: null-ptr-is-valid-attribute.ll

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llvm-toolchain-19 1%3A19.1.7-3~deb12u1
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -passes=instsimplify < %s | FileCheck %s

; A 0 valued byval pointer may be valid
define i1 @byval_may_be_zero(ptr byval(i32) %ptr) null_pointer_is_valid {
; CHECK-LABEL: @byval_may_be_zero(
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[PTR:%.*]], null
; CHECK-NEXT:    ret i1 [[CMP]]
;
  %cmp = icmp eq ptr %ptr, null
  ret i1 %cmp
}

define i1 @nonnull_may_be_zero(ptr nonnull %ptr) null_pointer_is_valid {
; CHECK-LABEL: @nonnull_may_be_zero(
; CHECK-NEXT:    ret i1 false
;
  %cmp = icmp eq ptr %ptr, null
  ret i1 %cmp
}