1 ; RUN: llc < %s -mtriple=i686-pc-win32 | FileCheck %s -check-prefix=WIN_X32
2 ; RUN: llc < %s -mtriple=i686-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X32
3 ; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X64
4 ; RUN: llc < %s -mtriple=i386-pc-linux | FileCheck %s -check-prefix=LINUX
6 ; Windows and mingw require a prologue helper routine if more than 4096 bytes area
7 ; allocated on the stack. Windows uses __chkstk and mingw uses __alloca. __alloca
8 ; and the 32-bit version of __chkstk will probe the stack and adjust the stack pointer.
9 ; The 64-bit version of __chkstk is only responsible for probing the stack. The 64-bit
10 ; prologue is responsible for adjusting the stack pointer.
12 ; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI.
13 define i32 @main4k() nounwind {
15 ; WIN_X32: calll __chkstk
16 ; WIN_X64: call __chkstk
17 ; MINGW_X32: calll __alloca
18 ; MINGW_X64: callq _alloca
19 ; LINUX-NOT: call __chkstk
20 %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0]
24 ; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack
26 define i32 @main128() nounwind {
29 ; WIN_X32-NOT: calll __chkstk
33 ; WIN_X64-NOT: call __chkstk
37 ; MINGW_X64-NOT: callq _alloca
41 ; LINUX-NOT: call __chkstk
43 %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0]