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. 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) nounwind 21declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind 22 23define fastcc void @l186(ptr %r1) nounwind { 24entry: 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 44 45true: 46 tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind 47 ret void 48 49false: 50 tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind 51 ret void 52} 53