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.
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.
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)
18 %tupl = type [9 x i32]
20 declare fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind
21 declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind
23 define fastcc void @l186(%tupl* %r1) nounwind {
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
47 tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind
51 tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind