1; RUN: llc < %s -mtriple=thumb-apple-ios | FileCheck %s --check-prefix=CHECK --check-prefix=IOS
2; RUN: llc < %s -mtriple=thumb-none-eabi | FileCheck %s --check-prefix=CHECK --check-prefix=EABI
3; RUN: llc < %s -o %t -filetype=obj -mtriple=thumbv6-apple-ios
4; RUN: llvm-objdump -triple=thumbv6-apple-ios -d %t | FileCheck %s --check-prefix=CHECK --check-prefix=IOS
5; RUN: llc < %s -o %t -filetype=obj -mtriple=thumbv6-none-eabi
6; RUN: llvm-objdump -triple=thumbv6-none-eabi -d %t | FileCheck %s --check-prefix=CHECK --check-prefix=EABI
7
8; Largest stack for which a single tADDspi/tSUBspi is enough
9define void @test1() {
10; CHECK-LABEL: test1:
11; CHECK: sub sp, #508
12; CHECK: add sp, #508
13    %tmp = alloca [ 508 x i8 ] , align 4
14    ret void
15}
16
17; Largest stack for which three tADDspi/tSUBspis are enough
18define void @test100() {
19; CHECK-LABEL: test100:
20; CHECK: sub sp, #508
21; CHECK: sub sp, #508
22; CHECK: sub sp, #508
23; EABI: add sp, #508
24; EABI: add sp, #508
25; EABI: add sp, #508
26; IOS: subs r4, r7, #4
27; IOS: mov sp, r4
28    %tmp = alloca [ 1524 x i8 ] , align 4
29    ret void
30}
31
32; Smallest stack for which we use a constant pool
33define void @test2() {
34; CHECK-LABEL: test2:
35; CHECK: ldr r0,
36; CHECK: add sp, r0
37; EABI: ldr r0,
38; EABI: add sp, r0
39; IOS: subs r4, r7, #4
40; IOS: mov sp, r4
41    %tmp = alloca [ 1528 x i8 ] , align 4
42    ret void
43}
44
45define i32 @test3() {
46; CHECK-LABEL: test3:
47; CHECK: ldr r1,
48; CHECK: add sp, r1
49; CHECK: ldr r1,
50; CHECK: add r1, sp
51; EABI: ldr r1,
52; EABI: add sp, r1
53; IOS: subs r4, r7, #4
54; IOS: mov sp, r4
55    %retval = alloca i32, align 4
56    %tmp = alloca i32, align 4
57    %a = alloca [805306369 x i8], align 16
58    store i32 0, i32* %tmp
59    %tmp1 = load i32* %tmp
60    ret i32 %tmp1
61}
62
63; Here, the adds get optimized out because they are dead, but the calculation
64; of the address of stack_a is dead but not optimized out. When the address
65; calculation gets expanded to two instructions, we need to avoid reading a
66; dead register.
67; No CHECK lines (just test for crashes), as we hope this will be optimised
68; better in future.
69define i32 @test4() {
70entry:
71  %stack_a = alloca i8, align 1
72  %stack_b = alloca [256 x i32*], align 4
73  %int = ptrtoint i8* %stack_a to i32
74  %add = add i32 %int, 1
75  br label %block2
76
77block2:
78  %add2 = add i32 %add, 1
79  ret i32 0
80}
81