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gerrit-public.fairphone.software / toolchain / llvm-project / bd857253419438e43dac6d657867cfb09ce43532 / . / llvm / test / CodeGen / X86 / win_chkstk.ll
blob: 2933eeb5404b04111dece2232d92214da2aa46c5 [file] [log] [blame]
Anton Korobeynikova5a64552010-09-02 23:03:46 +0000[diff] [blame]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
5
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.
11
12; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI.
13define i32 @main4k() nounwind {
14entry:
Chris Lattnerbd857252010-09-22 05:49:14 +0000[diff] [blame^]15; WIN_X32: calll __chkstk
Anton Korobeynikova5a64552010-09-02 23:03:46 +0000[diff] [blame]16; WIN_X64: call __chkstk
Chris Lattnerbd857252010-09-22 05:49:14 +0000[diff] [blame^]17; MINGW_X32: calll __alloca
18; MINGW_X64: calll _alloca
Anton Korobeynikova5a64552010-09-02 23:03:46 +0000[diff] [blame]19; LINUX-NOT: call __chkstk
20 %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0]
21 ret i32 0
22}
23
24; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack
25; allocation.
26define i32 @main128() nounwind {
27entry:
28; WIN_X32: # BB#0:
Chris Lattnerbd857252010-09-22 05:49:14 +0000[diff] [blame^]29; WIN_X32-NOT: calll __chkstk
Anton Korobeynikova5a64552010-09-02 23:03:46 +0000[diff] [blame]30; WIN_X32: ret
31
32; WIN_X64: # BB#0:
33; WIN_X64-NOT: call __chkstk
34; WIN_X64: ret
35
36; MINGW_X64: # BB#0:
37; MINGW_X64-NOT: call _alloca
38; MINGW_X64: ret
39
40; LINUX: # BB#0:
41; LINUX-NOT: call __chkstk
42; LINUX: ret
43 %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0]
44 ret i32 0
45}