1; RUN: llc -mcpu=generic -mtriple=i386-apple-darwin -tailcallopt -enable-misched=false < %s | FileCheck %s
2; Check that lowered argumens do not overwrite the return address before it is moved.
3; Bug 6225
4;
5; If a call is a fastcc tail call and tail call optimization is enabled, the
6; caller frame is replaced by the callee frame. This can require that arguments are
7; placed on the former return address stack slot. Special care needs to be taken
8; taken that the return address is moved / or stored in a register before
9; lowering of arguments potentially overwrites the value.
10;
11; Move return address (76(%esp)) to a temporary register (%ebp)
12; CHECK: movl 76(%esp), [[REGISTER:%[a-z]+]]
13; Overwrite return addresss
14; CHECK: movl [[EBX:%[a-z]+]], 76(%esp)
15; Move return address from temporary register (%ebp) to new stack location (60(%esp))
16; CHECK: movl [[REGISTER]], 60(%esp)
17
18%tupl = type [9 x i32]
19
20declare fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) noreturn nounwind
21declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind
22
23define fastcc void @l186(%tupl* %r1) noreturn nounwind {
24entry:
25  %ptr1 = getelementptr %tupl, %tupl* %r1, i32 0, i32 0
26  %r2 = load i32, i32* %ptr1
27  %ptr3 = getelementptr %tupl, %tupl* %r1, i32 0, i32 1
28  %r3 = load i32, i32* %ptr3
29  %ptr5 = getelementptr %tupl, %tupl* %r1, i32 0, i32 2
30  %r4 = load i32, i32* %ptr5
31  %ptr7 = getelementptr %tupl, %tupl* %r1, i32 0, i32 3
32  %r5 = load i32, i32* %ptr7
33  %ptr9 = getelementptr %tupl, %tupl* %r1, i32 0, i32 4
34  %r6 = load i32, i32* %ptr9
35  %ptr11 = getelementptr %tupl, %tupl* %r1, i32 0, i32 5
36  %r7 = load i32, i32* %ptr11
37  %ptr13 = getelementptr %tupl, %tupl* %r1, i32 0, i32 6
38  %r8 = load i32, i32* %ptr13
39  %ptr15 = getelementptr %tupl, %tupl* %r1, i32 0, i32 7
40  %r9 = load i32, i32* %ptr15
41  %ptr17 = getelementptr %tupl, %tupl* %r1, i32 0, i32 8
42  %r10 = load i32, i32* %ptr17
43  %cond = icmp eq i32 %r10, 3
44  br i1 %cond, label %true, label %false
45
46true:
47  tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) noreturn nounwind
48  ret void
49
50false:
51  tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind
52  ret void
53}
54