1; This test is attempting to detect that the compiler correctly generates stack
2; probe calls when the size of the local variables exceeds the specified stack
3; probe size.
4;
5; Testing the default value of 4096 bytes makes sense, because the default
6; stack probe size equals the page size (4096 bytes for all x86 targets), and
7; this is unlikely to change in the future.
8;
9; RUN: llc -mtriple=i686-windows-msvc < %s | FileCheck %s
10
11target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
12
13define i32 @test1() "stack-probe-size"="0" {
14  %buffer = alloca [4095 x i8]
15
16  ret i32 0
17
18; CHECK-LABEL: _test1:
19; CHECK-NOT: subl $4095, %esp
20; CHECK: movl $4095, %eax
21; CHECK: calll __chkstk
22}
23
24define i32 @test2() {
25  %buffer = alloca [4095 x i8]
26
27  ret i32 0
28
29; CHECK-LABEL: _test2:
30; CHECK-NOT: movl $4095, %eax
31; CHECK: subl $4095, %esp
32; CHECK-NOT: calll __chkstk
33}
34
35define i32 @test3() "stack-probe-size"="8192" {
36  %buffer = alloca [4095 x i8]
37
38  ret i32 0
39
40; CHECK-LABEL: _test3:
41; CHECK-NOT: movl $4095, %eax
42; CHECK: subl $4095, %esp
43; CHECK-NOT: calll __chkstk
44}
45
46define i32 @test4() "stack-probe-size"="0" {
47  %buffer = alloca [4096 x i8]
48
49  ret i32 0
50
51; CHECK-LABEL: _test4:
52; CHECK-NOT: subl $4096, %esp
53; CHECK: movl $4096, %eax
54; CHECK: calll __chkstk
55}
56
57define i32 @test5() {
58  %buffer = alloca [4096 x i8]
59
60  ret i32 0
61
62; CHECK-LABEL: _test5:
63; CHECK-NOT: subl $4096, %esp
64; CHECK: movl $4096, %eax
65; CHECK: calll __chkstk
66}
67
68define i32 @test6() "stack-probe-size"="8192" {
69  %buffer = alloca [4096 x i8]
70
71  ret i32 0
72
73; CGECK-LABEL: _test6:
74; CGECK-NOT: movl $4096, %eax
75; CGECK: subl $4096, %esp
76; CGECK-NOT: calll __chkstk
77}
78