1; RUN: opt < %s -basicaa -tailcallelim -inline -instcombine -dse -S | FileCheck %s
2; PR7272
3
4; Calls that capture byval parameters cannot be marked as tail calls. Other
5; tails that don't capture byval parameters can still be tail calls.
6
7target 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-f80:32:32-n8:16:32"
8target triple = "i386-pc-linux-gnu"
9
10declare void @ext(i32*)
11
12define void @bar(i32* byval %x) {
13  call void @ext(i32* %x)
14  ret void
15}
16
17define void @foo(i32* %x) {
18; CHECK-LABEL: define void @foo(
19; CHECK: llvm.lifetime.start
20; CHECK: store i32 %2, i32* %x
21  call void @bar(i32* byval %x)
22  ret void
23}
24
25define internal void @qux(i32* byval %x) {
26  call void @ext(i32* %x)
27  tail call void @ext(i32* null)
28  ret void
29}
30
31define void @frob(i32* %x) {
32; CHECK-LABEL: define void @frob(
33; CHECK: %[[POS:.*]] = alloca i32
34; CHECK: %[[VAL:.*]] = load i32, i32* %x
35; CHECK: store i32 %[[VAL]], i32* %[[POS]]
36; CHECK: {{^ *}}call void @ext(i32* nonnull %[[POS]]
37; CHECK: tail call void @ext(i32* null)
38; CHECK: ret void
39  tail call void @qux(i32* byval %x)
40  ret void
41}
42