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 8 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. 14 15 ; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI. 16 define i32 @main4k() nounwind { 17 entry: 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] 26 ret i32 0 27 } 28 29 ; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack 30 ; allocation. 31 define i32 @main128() nounwind { 32 entry: 33 ; WIN_X32: # BB#0: 34 ; WIN_X32-NOT: calll __chkstk 35 ; WIN_X32: ret 36 37 ; WIN_X64: # BB#0: 38 ; WIN_X64-NOT: callq __chkstk 39 ; WIN_X64: ret 40 41 ; MINGW_X64: # BB#0: 42 ; MINGW_X64-NOT: callq ___chkstk_ms 43 ; MINGW_X64: ret 44 45 ; LINUX: # BB#0: 46 ; LINUX-NOT: call __chkstk 47 ; LINUX: ret 48 %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0] 49 ret i32 0 50 } 51 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 x86_64_win64cc i32 @main4k_win64() nounwind { 55 entry: 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] 64 ret i32 0 65 } 66
