1 ; RUN: llc < %s -mtriple=i686-pc-win32 | FileCheck %s -check-prefix=WIN_X32
2 ; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN_X64
3 ; RUN: llc < %s -mtriple=x86_64-pc-win32 -code-model=large | FileCheck %s -check-prefix=WIN64_LARGE
4 ; RUN: llc < %s -mtriple=i686-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X32
5 ; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X64
6 ; RUN: llc < %s -mtriple=i386-pc-linux | FileCheck %s -check-prefix=LINUX
7 ; RUN: llc < %s -mtriple=x86_64-pc-win32-macho | FileCheck %s -check-prefix=LINUX
9 ; Windows and mingw require a prologue helper routine if more than 4096 bytes area
10 ; allocated on the stack. Windows uses __chkstk and mingw uses __alloca. __alloca
11 ; and the 32-bit version of __chkstk will probe the stack and adjust the stack pointer.
12 ; The 64-bit version of __chkstk is only responsible for probing the stack. The 64-bit
13 ; prologue is responsible for adjusting the stack pointer.
15 ; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI.
16 define i32 @main4k() nounwind {
18 ; WIN_X32: calll __chkstk
19 ; WIN_X64: callq __chkstk
20 ; WIN64_LARGE: movabsq $__chkstk, %r11
21 ; WIN64_LARGE: callq *%r11
22 ; MINGW_X32: calll __alloca
23 ; MINGW_X64: callq ___chkstk_ms
24 ; LINUX-NOT: call __chkstk
25 %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0]
29 ; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack
31 define i32 @main128() nounwind {
34 ; WIN_X32-NOT: calll __chkstk
38 ; WIN_X64-NOT: callq __chkstk
42 ; MINGW_X64-NOT: callq ___chkstk_ms
46 ; LINUX-NOT: call __chkstk
48 %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0]
52 ; Make sure we don't call __chkstk or __alloca on non-Windows even if the
53 ; caller has the Win64 calling convention.
54 define win64cc i32 @main4k_win64() nounwind {
56 ; WIN_X32: calll __chkstk
57 ; WIN_X64: callq __chkstk
58 ; WIN64_LARGE: movabsq $__chkstk, %r11
59 ; WIN64_LARGE: callq *%r11
60 ; MINGW_X32: calll __alloca
61 ; MINGW_X64: callq ___chkstk_ms
62 ; LINUX-NOT: call __chkstk
63 %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0]
67 ; PR30687: Avoid crashing when inserting a __chkstk call at the end of an MBB.
68 define void @dont_crash() {
70 ; WIN_X32: calll __chkstk
71 ; WIN_X64: callq __chkstk
72 ; WIN64_LARGE: movabsq $__chkstk, %r11
73 ; WIN64_LARGE: callq *%r11
74 ; MINGW_X32: calll __alloca
75 ; MINGW_X64: callq ___chkstk_ms
76 ; LINUX-NOT: call __chkstk
77 %buffer = alloca [4096 x i8]