You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
153 lines
4.2 KiB
153 lines
4.2 KiB
4 months ago
|
; RUN: llc -mtriple=thumbv7m-none-eabi -o - %s | FileCheck %s
|
||
|
|
|
||
|
|
declare void @foo()
|
||
|
|
|
||
|
|
; Leaf function, no frame so no need for a frame pointer.
|
||
|
|
define void @leaf() {
|
||
|
|
; CHECK-LABEL: leaf:
|
||
|
|
; CHECK-NOT: push
|
||
|
|
; CHECK-NOT: sp
|
||
|
|
; CHECK-NOT: pop
|
||
|
|
; CHECK: bx lr
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Leaf function, frame pointer is requested but we don't need any stack frame,
|
||
|
|
; so don't create a frame pointer.
|
||
|
|
define void @leaf_nofpelim() "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: leaf_nofpelim:
|
||
|
|
; CHECK-NOT: push
|
||
|
|
; CHECK-NOT: sp
|
||
|
|
; CHECK-NOT: pop
|
||
|
|
; CHECK: bx lr
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Leaf function, frame pointer is requested and we need a stack frame, so we
|
||
|
|
; need to use a frame pointer.
|
||
|
|
define void @leaf_lowreg_nofpelim() "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: leaf_lowreg_nofpelim:
|
||
|
|
; CHECK: push {r4, r6, r7, lr}
|
||
|
|
; CHECK: add r7, sp, #8
|
||
|
|
; CHECK: pop {r4, r6, r7, pc}
|
||
|
|
call void asm sideeffect "", "~{r4}" ()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Leaf function, frame pointer is requested and we need a stack frame, so we
|
||
|
|
; need to use a frame pointer. A high register is pushed to the stack, so we
|
||
|
|
; must use two push/pop instructions to ensure that fp and sp are adjacent on
|
||
|
|
; the stack.
|
||
|
|
define void @leaf_highreg_nofpelim() "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: leaf_highreg_nofpelim:
|
||
|
|
; CHECK: push {r6, r7, lr}
|
||
|
|
; CHECK: add r7, sp, #4
|
||
|
|
; CHECK: str r8, [sp, #-4]!
|
||
|
|
; CHECK: ldr r8, [sp], #4
|
||
|
|
; CHECK: pop {r6, r7, pc}
|
||
|
|
call void asm sideeffect "", "~{r8}" ()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Leaf function, frame pointer requested for non-leaf functions only, so no
|
||
|
|
; need for a stack frame.
|
||
|
|
define void @leaf_nononleaffpelim() "frame-pointer"="non-leaf" {
|
||
|
|
; CHECK-LABEL: leaf_nononleaffpelim:
|
||
|
|
; CHECK-NOT: push
|
||
|
|
; CHECK-NOT: sp
|
||
|
|
; CHECK-NOT: pop
|
||
|
|
; CHECK: bx lr
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a call, but still no need for a frame pointer.
|
||
|
|
define void @call() {
|
||
|
|
; CHECK-LABEL: call:
|
||
|
|
; CHECK: push {[[DUMMYREG:r[0-9]+]], lr}
|
||
|
|
; CHECK-NOT: sp
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: pop {[[DUMMYREG]], pc}
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a call, and frame pointer requested.
|
||
|
|
define void @call_nofpelim() "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: call_nofpelim:
|
||
|
|
; CHECK: push {r7, lr}
|
||
|
|
; CHECK: mov r7, sp
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: pop {r7, pc}
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a call, and frame pointer requested for non-leaf function.
|
||
|
|
define void @call_nononleaffpelim() "frame-pointer"="non-leaf" {
|
||
|
|
; CHECK-LABEL: call_nononleaffpelim:
|
||
|
|
; CHECK: push {r7, lr}
|
||
|
|
; CHECK: mov r7, sp
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: pop {r7, pc}
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a high register clobbered, no need for a frame pointer.
|
||
|
|
define void @highreg() {
|
||
|
|
; CHECK-LABEL: highreg:
|
||
|
|
; CHECK: push.w {r8, lr}
|
||
|
|
; CHECK-NOT: sp
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: pop.w {r8, pc}
|
||
|
|
call void asm sideeffect "", "~{r8}" ()
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a high register clobbered, frame pointer requested. We need to split the
|
||
|
|
; push into two, to ensure that r7 and sp are adjacent on the stack.
|
||
|
|
define void @highreg_nofpelim() "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: highreg_nofpelim:
|
||
|
|
; CHECK: push {[[DUMMYREG:r[0-9]+]], r7, lr}
|
||
|
|
; CHECK: add r7, sp, #4
|
||
|
|
; CHECK: str r8, [sp, #-4]!
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: ldr r8, [sp], #4
|
||
|
|
; CHECK: pop {[[DUMMYREG]], r7, pc}
|
||
|
|
call void asm sideeffect "", "~{r8}" ()
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a high register clobbered, frame required due to variable-sized alloca.
|
||
|
|
; We need a frame pointer to correctly restore the stack, but don't need to
|
||
|
|
; split the push/pop here, because the frame pointer not required by the ABI.
|
||
|
|
define void @highreg_alloca(i32 %a) {
|
||
|
|
; CHECK-LABEL: highreg_alloca:
|
||
|
|
; CHECK: push.w {[[SOMEREGS:.*]], r7, r8, lr}
|
||
|
|
; CHECK: add r7, sp, #{{[0-9]+}}
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: pop.w {[[SOMEREGS]], r7, r8, pc}
|
||
|
|
%alloca = alloca i32, i32 %a, align 4
|
||
|
|
call void @foo()
|
||
|
|
call void asm sideeffect "", "~{r8}" ()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; Has a high register clobbered, frame required due to both variable-sized
|
||
|
|
; alloca and ABI. We do need to split the push/pop here.
|
||
|
|
define void @highreg_alloca_nofpelim(i32 %a) "frame-pointer"="all" {
|
||
|
|
; CHECK-LABEL: highreg_alloca_nofpelim:
|
||
|
|
; CHECK: push {[[SOMEREGS:.*]], r7, lr}
|
||
|
|
; CHECK: add r7, sp, #{{[0-9]+}}
|
||
|
|
; CHECK: str r8, [sp, #-4]!
|
||
|
|
; CHECK: bl foo
|
||
|
|
; CHECK: ldr r8, [sp], #4
|
||
|
|
; CHECK: pop {[[SOMEREGS]], r7, pc}
|
||
|
|
%alloca = alloca i32, i32 %a, align 4
|
||
|
|
call void @foo()
|
||
|
|
call void asm sideeffect "", "~{r8}" ()
|
||
|
|
ret void
|
||
|
|
}
|