source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/ARM/varargs-spill-stack-align-nacl.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

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1; RUN: llc < %s -mtriple=arm-nacl-gnueabi | FileCheck %s
2
3declare void @llvm.va_start(i8*)
4declare 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
16define 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}
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