1 ; RUN: opt < %s -basicaa -gvn -asan -S | FileCheck %s
2 ; ASAN conflicts with load widening iff the widened load accesses data out of bounds
3 ; (while the original unwidened loads do not).
4 ; http://code.google.com/p/address-sanitizer/issues/detail?id=20#c1
7 ; 32-bit little endian target.
8 target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
10 %struct_of_7_bytes_4_aligned = type { i32, i8, i8, i8}
12 @f = global %struct_of_7_bytes_4_aligned zeroinitializer, align 4
14 ; Accessing bytes 4 and 6, not ok to widen to i32 if address_safety is set.
16 define i32 @test_widening_bad(i8* %P) nounwind ssp noredzone address_safety {
18 %tmp = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
19 %conv = zext i8 %tmp to i32
20 %tmp1 = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 3), align 1
21 %conv2 = zext i8 %tmp1 to i32
22 %add = add nsw i32 %conv, %conv2
24 ; CHECK: @test_widening_bad
25 ; CHECK: __asan_report_load1
26 ; CHECK: __asan_report_load1
30 ;; Accessing byets 4 and 5. Ok to widen to i16.
32 define i32 @test_widening_ok(i8* %P) nounwind ssp noredzone address_safety {
34 %tmp = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 1), align 4
35 %conv = zext i8 %tmp to i32
36 %tmp1 = load i8* getelementptr inbounds (%struct_of_7_bytes_4_aligned* @f, i64 0, i32 2), align 1
37 %conv2 = zext i8 %tmp1 to i32
38 %add = add nsw i32 %conv, %conv2
40 ; CHECK: @test_widening_ok
41 ; CHECK: __asan_report_load1