| Evgeniy Stepanov | 4fbc0d08 | 2012-12-21 11:18:49 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -msan -S | FileCheck %s |
| 2 | 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" |
| 3 | target triple = "x86_64-unknown-linux-gnu" |
| 4 | |
| 5 | |
| 6 | ; Test that MemorySanitizer correctly handles unreachable blocks. |
| 7 | |
| 8 | define i32 @Func(i32* %p) nounwind uwtable { |
| 9 | entry: |
| 10 | br label %exit |
| 11 | |
| 12 | unreachable: |
| David Blaikie | a79ac14 | 2015-02-27 21:17:42 +0000 | [diff] [blame] | 13 | %x = load i32, i32* %p |
| Evgeniy Stepanov | 4fbc0d08 | 2012-12-21 11:18:49 +0000 | [diff] [blame] | 14 | br label %exit |
| 15 | |
| 16 | exit: |
| 17 | %z = phi i32 [ 42, %entry ], [ %x, %unreachable ] |
| 18 | ret i32 %z |
| 19 | } |
| 20 | |
| Evgeniy Stepanov | b0b2d4d | 2015-08-25 20:59:26 +0000 | [diff] [blame] | 21 | ; CHECK-LABEL: @Func |
| Evgeniy Stepanov | 4fbc0d08 | 2012-12-21 11:18:49 +0000 | [diff] [blame] | 22 | ; CHECK: store i32 0, {{.*}} @__msan_retval_tls |
| 23 | ; CHECK: ret i32 42 |
| Evgeniy Stepanov | 2a066af | 2013-03-22 08:43:04 +0000 | [diff] [blame] | 24 | |
| 25 | |
| 26 | define i32 @UnreachableLoop() nounwind uwtable { |
| 27 | entry: |
| 28 | ret i32 0 |
| 29 | |
| 30 | zzz: |
| 31 | br label %xxx |
| 32 | |
| 33 | xxx: |
| 34 | br label %zzz |
| 35 | } |
| 36 | |
| Evgeniy Stepanov | b0b2d4d | 2015-08-25 20:59:26 +0000 | [diff] [blame] | 37 | ; CHECK-LABEL: @UnreachableLoop |
| Evgeniy Stepanov | 2a066af | 2013-03-22 08:43:04 +0000 | [diff] [blame] | 38 | ; CHECK: store i32 0, {{.*}} @__msan_retval_tls |
| 39 | ; CHECK: ret i32 0 |