; RUN: opt -S -codegenprepare %s -o - | FileCheck %s
;
; Ensure that we don't {crash,return a bad value} when given an alloca larger
; than what a pointer can represent.

target datalayout = "p:16:16"

; CHECK-LABEL: @alloca_overflow_is_unknown(
define i16 @alloca_overflow_is_unknown() {
  %i = alloca i8, i32 65537
  %j = call i16 @llvm.objectsize.i16.p0i8(i8* %i, i1 false, i1 false)
  ; CHECK: ret i16 -1
  ret i16 %j
}

declare i16 @llvm.objectsize.i16.p0i8(i8*, i1, i1)

Add a test for r307754
Add a test for r307754

As promised in D35003.

Uses -codegenprepare instead of -instcombine since we hit the same
buggy path anyway, and CGP lets us keep this test really simple
(instcombine likes turning the alloca T, N into alloca [N x T], which
hides the bug this is testing for).


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@307811 91177308-0d34-0410-b5e6-96231b3b80d8
