1 ; RUN: llc -mtriple=i386-apple-darwin -tailcallopt < %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_p = type [9 x i32]* 19 20 declare fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) noreturn nounwind 21 declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind 22 23 define fastcc void @l186(%tupl_p %r1) noreturn nounwind { 24 entry: 25 %ptr1 = getelementptr %tupl_p %r1, i32 0, i32 0 26 %r2 = load i32* %ptr1 27 %ptr3 = getelementptr %tupl_p %r1, i32 0, i32 1 28 %r3 = load i32* %ptr3 29 %ptr5 = getelementptr %tupl_p %r1, i32 0, i32 2 30 %r4 = load i32* %ptr5 31 %ptr7 = getelementptr %tupl_p %r1, i32 0, i32 3 32 %r5 = load i32* %ptr7 33 %ptr9 = getelementptr %tupl_p %r1, i32 0, i32 4 34 %r6 = load i32* %ptr9 35 %ptr11 = getelementptr %tupl_p %r1, i32 0, i32 5 36 %r7 = load i32* %ptr11 37 %ptr13 = getelementptr %tupl_p %r1, i32 0, i32 6 38 %r8 = load i32* %ptr13 39 %ptr15 = getelementptr %tupl_p %r1, i32 0, i32 7 40 %r9 = load i32* %ptr15 41 %ptr17 = getelementptr %tupl_p %r1, i32 0, i32 8 42 %r10 = load i32* %ptr17 43 %cond = icmp eq i32 %r10, 3 44 br i1 %cond, label %true, label %false 45 46 true: 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 50 false: 51 tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) noreturn nounwind 52 ret void 53 } 54 55 56
