xref: /llvm-project/llvm/test/Transforms/GVN/lifetime-simple.ll (revision 23abf931386002fb9d2c11d026846475c224c641) 
1; RUN: opt < %s -passes=gvn -S | FileCheck %s
2
3target 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"
4target triple = "i386-apple-darwin7"
5
6define i8 @test(ptr %P) nounwind {
7; CHECK: lifetime.start
8; CHECK-NOT: load
9; CHECK: lifetime.end
10entry:
11  call void @llvm.lifetime.start.p0(i64 32, ptr %P)
12  %0 = load i8, ptr %P
13  store i8 1, ptr %P
14  call void @llvm.lifetime.end.p0(i64 32, ptr %P)
15  %1 = load i8, ptr %P
16  ret i8 %1
17}
18
19declare void @llvm.lifetime.start.p0(i64 %S, ptr nocapture %P) readonly
20declare void @llvm.lifetime.end.p0(i64 %S, ptr nocapture %P)
21