1 ; RUN: llc < %s -mtriple=arm-nacl-gnueabi | FileCheck %s
3 declare void @llvm.va_start(ptr)
4 declare void @external_func(ptr)
6 @va_list = external global ptr
8 ; On ARM, varargs arguments are passed in r0-r3 with the rest on the
9 ; stack. A varargs function must therefore spill rN-r3 just below the
10 ; function's initial stack pointer.
12 ; This test checks for a bug in which a gap was left between the spill
13 ; area and varargs arguments on the stack when using 16 byte stack
16 define void @varargs_func(i32 %arg1, ...) {
17 call void @llvm.va_start(ptr @va_list)
18 call void @external_func(ptr @va_list)
21 ; CHECK-LABEL: varargs_func:
22 ; Reserve space for the varargs save area. This currently reserves
23 ; more than enough (16 bytes rather than the 12 bytes needed).
24 ; CHECK: sub sp, sp, #12
25 ; CHECK: push {r11, lr}
26 ; Align the stack pointer to a multiple of 16.
27 ; CHECK: sub sp, sp, #12
28 ; Calculate the address of the varargs save area and save varargs
30 ; CHECK-NEXT: add r0, sp, #20
31 ; CHECK-NEXT: stm r0, {r1, r2, r3}