blob: 305c916dc02b9c66884432a5500fb2007b67451c [file] [log] [blame]
Dan Gohman02538ac2010-10-18 18:04:47 +00001; RUN: opt -S -basicaa -dse < %s | FileCheck %s
Nick Lewycky90271472009-11-10 06:46:40 +00002
Nick Lewycky218a3392009-11-28 21:27:49 +00003target 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
5declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
6declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
Chris Lattner80ed9dc2011-06-18 06:05:24 +00007declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i32, i1) nounwind
Nick Lewycky90271472009-11-10 06:46:40 +00008
9define void @test1() {
Stephen Linc1c7a132013-07-14 01:42:54 +000010; CHECK-LABEL: @test1(
Nick Lewycky90271472009-11-10 06:46:40 +000011 %A = alloca i8
12
13 store i8 0, i8* %A ;; Written to by memset
14 call void @llvm.lifetime.end(i64 1, i8* %A)
15; CHECK: lifetime.end
16
Chris Lattner80ed9dc2011-06-18 06:05:24 +000017 call void @llvm.memset.p0i8.i8(i8* %A, i8 0, i8 -1, i32 0, i1 false)
Nick Lewycky90271472009-11-10 06:46:40 +000018; CHECK-NOT: memset
19
20 ret void
21; CHECK: ret void
22}
Nick Lewycky218a3392009-11-28 21:27:49 +000023
24define void @test2(i32* %P) {
25; CHECK: test2
David Blaikie79e6c742015-02-27 19:29:02 +000026 %Q = getelementptr i32, i32* %P, i32 1
Nick Lewycky218a3392009-11-28 21:27:49 +000027 %R = bitcast i32* %Q to i8*
28 call void @llvm.lifetime.start(i64 4, i8* %R)
29; CHECK: lifetime.start
30 store i32 0, i32* %Q ;; This store is dead.
31; CHECK-NOT: store
32 call void @llvm.lifetime.end(i64 4, i8* %R)
33; CHECK: lifetime.end
34 ret void
35}
36
37