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=i686-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X32 4 ; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X64 5 ; RUN: llc < %s -mtriple=i386-pc-linux | FileCheck %s -check-prefix=LINUX 6 ; RUN: llc < %s -mtriple=x86_64-pc-win32-macho | FileCheck %s -check-prefix=LINUX 7 8 ; Windows and mingw require a prologue helper routine if more than 4096 bytes area 9 ; allocated on the stack. Windows uses __chkstk and mingw uses __alloca. __alloca 10 ; and the 32-bit version of __chkstk will probe the stack and adjust the stack pointer. 11 ; The 64-bit version of __chkstk is only responsible for probing the stack. The 64-bit 12 ; prologue is responsible for adjusting the stack pointer. 13 14 ; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI. 15 define i32 @main4k() nounwind { 16 entry: 17 ; WIN_X32: calll __chkstk 18 ; WIN_X64: callq __chkstk 19 ; MINGW_X32: calll __alloca 20 ; MINGW_X64: callq ___chkstk 21 ; LINUX-NOT: call __chkstk 22 %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0] 23 ret i32 0 24 } 25 26 ; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack 27 ; allocation. 28 define i32 @main128() nounwind { 29 entry: 30 ; WIN_X32: # BB#0: 31 ; WIN_X32-NOT: calll __chkstk 32 ; WIN_X32: ret 33 34 ; WIN_X64: # BB#0: 35 ; WIN_X64-NOT: callq __chkstk 36 ; WIN_X64: ret 37 38 ; MINGW_X64: # BB#0: 39 ; MINGW_X64-NOT: callq _alloca 40 ; MINGW_X64: ret 41 42 ; LINUX: # BB#0: 43 ; LINUX-NOT: call __chkstk 44 ; LINUX: ret 45 %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0] 46 ret i32 0 47 } 48
