1 ; RUN: llc -mcpu=generic -mtriple=i386-apple-darwin -tailcallopt -enable-misched=false < %s | FileCheck %s
2 ; Check that lowered arguments 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(ptr %r1) nounwind {
25 %r2 = load i32, ptr %r1
26 %ptr3 = getelementptr %tupl, ptr %r1, i32 0, i32 1
27 %r3 = load i32, ptr %ptr3
28 %ptr5 = getelementptr %tupl, ptr %r1, i32 0, i32 2
29 %r4 = load i32, ptr %ptr5
30 %ptr7 = getelementptr %tupl, ptr %r1, i32 0, i32 3
31 %r5 = load i32, ptr %ptr7
32 %ptr9 = getelementptr %tupl, ptr %r1, i32 0, i32 4
33 %r6 = load i32, ptr %ptr9
34 %ptr11 = getelementptr %tupl, ptr %r1, i32 0, i32 5
35 %r7 = load i32, ptr %ptr11
36 %ptr13 = getelementptr %tupl, ptr %r1, i32 0, i32 6
37 %r8 = load i32, ptr %ptr13
38 %ptr15 = getelementptr %tupl, ptr %r1, i32 0, i32 7
39 %r9 = load i32, ptr %ptr15
40 %ptr17 = getelementptr %tupl, ptr %r1, i32 0, i32 8
41 %r10 = load i32, ptr %ptr17
42 %cond = icmp eq i32 %r10, 3
43 br i1 %cond, label %true, label %false
46 tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind
50 tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind