| Mark Seaborn | be266aa | 2014-02-16 18:59:48 +0000 | [diff] [blame] | 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, #16 |
| 25 | ; CHECK: push {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} |