| Dan Gohman | 02538ac | 2010-10-18 18:04:47 +0000 | [diff] [blame] | 1 | ; RUN: opt -S -basicaa -dse < %s | FileCheck %s |
| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 2 | |
| Nick Lewycky | 218a339 | 2009-11-28 21:27:49 +0000 | [diff] [blame] | 3 | target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" |
| 4 | |
| Matt Arsenault | f10061e | 2017-04-10 20:18:21 +0000 | [diff] [blame] | 5 | declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind |
| 6 | declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind |
| Daniel Neilson | 1e68724 | 2018-01-19 17:13:12 +0000 | [diff] [blame] | 7 | declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i1) nounwind |
| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 8 | |
| 9 | define void @test1() { |
| Stephen Lin | c1c7a13 | 2013-07-14 01:42:54 +0000 | [diff] [blame] | 10 | ; CHECK-LABEL: @test1( |
| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 11 | %A = alloca i8 |
| 12 | |
| 13 | store i8 0, i8* %A ;; Written to by memset |
| Matt Arsenault | f10061e | 2017-04-10 20:18:21 +0000 | [diff] [blame] | 14 | call void @llvm.lifetime.end.p0i8(i64 1, i8* %A) |
| Bjorn Steinbrink | 2e2f665 | 2015-08-20 08:58:47 +0000 | [diff] [blame] | 15 | ; CHECK: lifetime.end |
| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 16 | |
| Daniel Neilson | 1e68724 | 2018-01-19 17:13:12 +0000 | [diff] [blame] | 17 | call void @llvm.memset.p0i8.i8(i8* %A, i8 0, i8 -1, i1 false) |
| Nick Lewycky | 9027147 | 2009-11-10 06:46:40 +0000 | [diff] [blame] | 18 | ; CHECK-NOT: memset |
| 19 | |
| 20 | ret void |
| 21 | ; CHECK: ret void |
| 22 | } |
| Nick Lewycky | 218a339 | 2009-11-28 21:27:49 +0000 | [diff] [blame] | 23 | |
| 24 | define void @test2(i32* %P) { |
| Bjorn Steinbrink | 2e2f665 | 2015-08-20 08:58:47 +0000 | [diff] [blame] | 25 | ; CHECK: test2 |
| David Blaikie | 79e6c74 | 2015-02-27 19:29:02 +0000 | [diff] [blame] | 26 | %Q = getelementptr i32, i32* %P, i32 1 |
| Nick Lewycky | 218a339 | 2009-11-28 21:27:49 +0000 | [diff] [blame] | 27 | %R = bitcast i32* %Q to i8* |
| Matt Arsenault | f10061e | 2017-04-10 20:18:21 +0000 | [diff] [blame] | 28 | call void @llvm.lifetime.start.p0i8(i64 4, i8* %R) |
| Nick Lewycky | 218a339 | 2009-11-28 21:27:49 +0000 | [diff] [blame] | 29 | ; CHECK: lifetime.start |
| 30 | store i32 0, i32* %Q ;; This store is dead. |
| 31 | ; CHECK-NOT: store |
| Matt Arsenault | f10061e | 2017-04-10 20:18:21 +0000 | [diff] [blame] | 32 | call void @llvm.lifetime.end.p0i8(i64 4, i8* %R) |
| Nick Lewycky | 218a339 | 2009-11-28 21:27:49 +0000 | [diff] [blame] | 33 | ; CHECK: lifetime.end |
| 34 | ret void |
| 35 | } |
| 36 | |
| 37 | |