[asan] one more test for asan instrumentation: (*a)++ should be instrumented only...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147509 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Instrumentation/AddressSanitizer/instrument_load_then_store.ll b/test/Instrumentation/AddressSanitizer/instrument_load_then_store.ll
new file mode 100644 (file)
index 0000000..633cf4f
--- /dev/null
+++ b/test/Instrumentation/AddressSanitizer/instrument_load_then_store.ll
@@ -0,0 +1,25 @@
+; Test that AddressSanitizer instruments "(*a)++" only once.
+; RUN: opt < %s -asan -S -asan-opt=1 | FileCheck %s -check-prefix=OPT1
+; RUN: opt < %s -asan -S -asan-opt=0 | FileCheck %s -check-prefix=OPT0
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
+target triple = "x86_64-unknown-linux-gnu"
+define void @IncrementMe(i32* %a) {
+entry:
+  %tmp1 = load i32* %a, align 4
+  %tmp2 = add i32 %tmp1,  1
+  store i32 %tmp2, i32* %a, align 4
+  ret void
+}
+
+; With optimizations enabled we should see only one call to __asan_report_*
+; OPT1: IncrementMe
+; OPT1: __asan_report_
+; OPT1-NOT: __asan_report_
+; OPT1: asan.module_ctor
+
+; Without optimizations we should see two calls to __asan_report_*
+; OPT0: IncrementMe
+; OPT0: __asan_report_
+; OPT0: __asan_report_
+; OPT0: asan.module_ctor