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

declare i8* @realloc(i8* allocptr, i64) allockind("realloc") allocsize(1)
declare noalias i8* @malloc(i64) allockind("alloc,uninitialized")


define i8* @realloc_null_ptr() #0 {
; CHECK-LABEL: @realloc_null_ptr(
; CHECK-NEXT:    [[MALLOC:%.*]] = call dereferenceable_or_null(100) i8* @malloc(i64 100)
; CHECK-NEXT:    ret i8* [[MALLOC]]
;
  %call = call i8* @realloc(i8* null, i64 100) #2
  ret i8* %call
}

define i8* @realloc_unknown_ptr(i8* %ptr) #0 {
; CHECK-LABEL: @realloc_unknown_ptr(
; CHECK-NEXT:    [[CALL:%.*]] = call dereferenceable_or_null(100) i8* @realloc(i8* [[PTR:%.*]], i64 100)
; CHECK-NEXT:    ret i8* [[CALL]]
;
  %call = call i8* @realloc(i8* %ptr, i64 100) #2
  ret i8* %call
}