1 ; RUN: llc < %s -mtriple=arm-nacl-gnueabi | FileCheck %s 2 3 declare void @llvm.va_start(i8*) 4 declare void @external_func(i8*) 5 6 @va_list = external global i8* 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 16 define void @varargs_func(i32 %arg1, ...) { 17 call void @llvm.va_start(i8* bitcast (i8** @va_list to i8*)) 18 call void @external_func(i8* bitcast (i8** @va_list to i8*)) 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
