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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).

llvm-svn: 307811
This commit is contained in:
George Burgess IV 2017-07-12 16:30:37 +00:00
parent 98a6b3ea87
commit 6f92d2dd24
1 changed files with 16 additions and 0 deletions
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16
llvm/test/Transforms/CodeGenPrepare/crash-on-large-allocas.ll Normal file
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@ -0,0 +1,16 @@
; 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)