| ; RUN: llc < %s -mtriple=arm-nacl-gnueabi | FileCheck %s | |
| declare void @llvm.va_start(i8*) | |
| declare void @external_func(i8*) | |
| @va_list = external global i8* | |
| ; On ARM, varargs arguments are passed in r0-r3 with the rest on the | |
| ; stack. A varargs function must therefore spill rN-r3 just below the | |
| ; function's initial stack pointer. | |
| ; | |
| ; This test checks for a bug in which a gap was left between the spill | |
| ; area and varargs arguments on the stack when using 16 byte stack | |
| ; alignment. | |
| define void @varargs_func(i32 %arg1, ...) { | |
| call void @llvm.va_start(i8* bitcast (i8** @va_list to i8*)) | |
| call void @external_func(i8* bitcast (i8** @va_list to i8*)) | |
| ret void | |
| } | |
| ; CHECK-LABEL: varargs_func: | |
| ; Reserve space for the varargs save area. This currently reserves | |
| ; more than enough (16 bytes rather than the 12 bytes needed). | |
| ; CHECK: sub sp, sp, #12 | |
| ; CHECK: push {r11, lr} | |
| ; Align the stack pointer to a multiple of 16. | |
| ; CHECK: sub sp, sp, #12 | |
| ; Calculate the address of the varargs save area and save varargs | |
| ; arguments into it. | |
| ; CHECK-NEXT: add r0, sp, #20 | |
| ; CHECK-NEXT: stm r0, {r1, r2, r3} |