1; RUN: llc < %s -mtriple=arm-nacl-gnueabi | FileCheck %s 2 3declare void @llvm.va_start(ptr) 4declare void @external_func(ptr) 5 6@va_list = external global ptr 7 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. 11; 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 14; alignment. 15 16define void @varargs_func(i32 %arg1, ...) { 17 call void @llvm.va_start(ptr @va_list) 18 call void @external_func(ptr @va_list) 19 ret void 20} 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 29; arguments into it. 30; CHECK-NEXT: add r0, sp, #20 31; CHECK-NEXT: stm r0, {r1, r2, r3} 32