|  | ; RUN: opt < %s -dfsan -verify -dfsan-args-abi -S | FileCheck %s | 
|  | 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-S128" | 
|  | target triple = "x86_64-unknown-linux-gnu" | 
|  |  | 
|  | ; CHECK-LABEL: @"dfs$unreachable_bb1" | 
|  | define i8 @unreachable_bb1() { | 
|  | ; CHECK: ret { i8, i16 } { i8 1, i16 0 } | 
|  | ; CHECK-NOT: bb2: | 
|  | ; CHECK-NOT: bb3: | 
|  | ; CHECK-NOT: bb4: | 
|  | ret i8 1 | 
|  |  | 
|  | bb2: | 
|  | ret i8 2 | 
|  |  | 
|  | bb3: | 
|  | br label %bb4 | 
|  |  | 
|  | bb4: | 
|  | br label %bb3 | 
|  | } | 
|  |  | 
|  | declare void @abort() noreturn | 
|  |  | 
|  | ; CHECK-LABEL: @"dfs$unreachable_bb2" | 
|  | define i8 @unreachable_bb2() { | 
|  | call void @abort() noreturn | 
|  | ; CHECK-NOT: i8 12 | 
|  | ; CHECK: unreachable | 
|  | ret i8 12 | 
|  | } |