1; RUN: opt < %s "-passes=function(require<basic-aa>,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; https://github.com/google/sanitizers/issues/20#issuecomment-136381262 5 6 7; 32-bit little endian target. 8target 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" 9 10%struct_of_7_bytes_4_aligned = type { i32, i8, i8, i8} 11 12@f = external global %struct_of_7_bytes_4_aligned , align 4 13 14; Accessing bytes 4 and 6, not ok to widen to i32 if sanitize_address is set. 15 16define i32 @test_widening_bad(ptr %P) nounwind ssp noredzone sanitize_address { 17entry: 18 %tmp = load i8, ptr getelementptr inbounds (%struct_of_7_bytes_4_aligned, ptr @f, i64 0, i32 1), align 4 19 %conv = zext i8 %tmp to i32 20 %tmp1 = load i8, ptr getelementptr inbounds (%struct_of_7_bytes_4_aligned, ptr @f, i64 0, i32 3), align 1 21 %conv2 = zext i8 %tmp1 to i32 22 %add = add nsw i32 %conv, %conv2 23 ret i32 %add 24; CHECK: @test_widening_bad 25; CHECK: __asan_report_load1 26; CHECK: __asan_report_load1 27; CHECK-NOT: __asan_report 28; We can not use check for "ret" here because __asan_report_load1 calls live after ret. 29; CHECK: end_test_widening_bad 30} 31 32define void @end_test_widening_bad() { 33 entry: 34 ret void 35} 36 37;; Accessing bytes 4 and 5. No widen to i16. 38 39define i32 @test_widening_ok(ptr %P) nounwind ssp noredzone sanitize_address { 40entry: 41 %tmp = load i8, ptr getelementptr inbounds (%struct_of_7_bytes_4_aligned, ptr @f, i64 0, i32 1), align 4 42 %conv = zext i8 %tmp to i32 43 %tmp1 = load i8, ptr getelementptr inbounds (%struct_of_7_bytes_4_aligned, ptr @f, i64 0, i32 2), align 1 44 %conv2 = zext i8 %tmp1 to i32 45 %add = add nsw i32 %conv, %conv2 46 ret i32 %add 47; CHECK: @test_widening_ok 48; CHECK: __asan_report_load1 49; CHECK: __asan_report_load1 50; CHECK-NOT: __asan_report 51; CHECK: end_test_widening_ok 52} 53 54define void @end_test_widening_ok() { 55 entry: 56 ret void 57} 58