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[asan] properly instrument memory accesses that have small alignment (smaller than min(8,size)) by making two checks instead of one. This may slowdown some cases, e.g. long long on 32-bit or wide loads produced after loop unrolling. The benefit is higher sencitivity.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209508 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2014-05-23 11:52:07 +00:00
parent 4f22c980f4
commit f2938bf8da
4 changed files with 44 additions and 18 deletions
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16
test/Instrumentation/AddressSanitizer/basic.ll
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@@ -34,7 +34,7 @@ define i32 @test_load(i32* %a) sanitize_address {
entry:
%tmp1 = load i32* %a
%tmp1 = load i32* %a, align 4
ret i32 %tmp1
}
@@ -66,7 +66,7 @@ define void @test_store(i32* %a) sanitize_address {
;
entry:
store i32 42, i32* %a
store i32 42, i32* %a, align 4
ret void
}
@@ -115,6 +115,18 @@ define void @i40test(i40* %a, i40* %b) nounwind uwtable sanitize_address {
; CHECK: __asan_report_store_n{{.*}}, i64 5)
; CHECK: ret void
define void @i64test_align1(i64* %b) nounwind uwtable sanitize_address {
entry:
store i64 0, i64* %b, align 1
ret void
}
; CHECK-LABEL: i64test_align1
; CHECK: __asan_report_store_n{{.*}}, i64 8)
; CHECK: __asan_report_store_n{{.*}}, i64 8)
; CHECK: ret void
define void @i80test(i80* %a, i80* %b) nounwind uwtable sanitize_address {
entry:
%t = load i80* %a