diff options
Diffstat (limited to 'test/Instrumentation')
| -rw-r--r-- | test/Instrumentation/ThreadSanitizer/tsan-vs-gvn.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/test/Instrumentation/ThreadSanitizer/tsan-vs-gvn.ll b/test/Instrumentation/ThreadSanitizer/tsan-vs-gvn.ll new file mode 100644 index 0000000..2eee6a5 --- /dev/null +++ b/test/Instrumentation/ThreadSanitizer/tsan-vs-gvn.ll @@ -0,0 +1,26 @@ +; RUN: opt < %s -basicaa -gvn -tsan -S | FileCheck %s +; TSAN conflicts with load widening. Make sure the load widening is off with -tsan. + +; 32-bit little endian target. +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" + +%struct_of_8_bytes_4_aligned = type { i32, i8, i8, i8, i8} + +@f = global %struct_of_8_bytes_4_aligned zeroinitializer, align 4 + +; Accessing bytes 4 and 6, not ok to widen to i32 if thread_safety is set. + +define i32 @test_widening_bad(i8* %P) nounwind ssp noredzone thread_safety { +entry: + %tmp = load i8* getelementptr inbounds (%struct_of_8_bytes_4_aligned* @f, i64 0, i32 1), align 4 + %conv = zext i8 %tmp to i32 + %tmp1 = load i8* getelementptr inbounds (%struct_of_8_bytes_4_aligned* @f, i64 0, i32 3), align 1 + %conv2 = zext i8 %tmp1 to i32 + %add = add nsw i32 %conv, %conv2 + ret i32 %add +; CHECK: @test_widening_bad +; CHECK: call void @__tsan_read1 +; CHECK: call void @__tsan_read1 +; CHECK-NOT: call void @__tsan_read4 +; CHECK: ret i32 +} |