| ; RUN: llc < %s -mtriple=i686-pc-win32 | FileCheck %s -check-prefix=WIN_X32 |
| ; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN_X64 |
| ; RUN: llc < %s -mtriple=x86_64-pc-win32 -code-model=large | FileCheck %s -check-prefix=WIN64_LARGE |
| ; RUN: llc < %s -mtriple=i686-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X32 |
| ; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X64 |
| ; RUN: llc < %s -mtriple=i386-pc-linux | FileCheck %s -check-prefix=LINUX |
| ; RUN: llc < %s -mtriple=x86_64-pc-win32-macho | FileCheck %s -check-prefix=LINUX |
| |
| ; Windows and mingw require a prologue helper routine if more than 4096 bytes area |
| ; allocated on the stack. Windows uses __chkstk and mingw uses __alloca. __alloca |
| ; and the 32-bit version of __chkstk will probe the stack and adjust the stack pointer. |
| ; The 64-bit version of __chkstk is only responsible for probing the stack. The 64-bit |
| ; prologue is responsible for adjusting the stack pointer. |
| |
| ; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI. |
| define i32 @main4k() nounwind { |
| entry: |
| ; WIN_X32: calll __chkstk |
| ; WIN_X64: callq __chkstk |
| ; WIN64_LARGE: movabsq $__chkstk, %r11 |
| ; WIN64_LARGE: callq *%r11 |
| ; MINGW_X32: calll __alloca |
| ; MINGW_X64: callq ___chkstk_ms |
| ; LINUX-NOT: call __chkstk |
| %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0] |
| ret i32 0 |
| } |
| |
| ; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack |
| ; allocation. |
| define i32 @main128() nounwind { |
| entry: |
| ; WIN_X32: # %bb.0: |
| ; WIN_X32-NOT: calll __chkstk |
| ; WIN_X32: ret |
| |
| ; WIN_X64: # %bb.0: |
| ; WIN_X64-NOT: callq __chkstk |
| ; WIN_X64: ret |
| |
| ; MINGW_X64: # %bb.0: |
| ; MINGW_X64-NOT: callq ___chkstk_ms |
| ; MINGW_X64: ret |
| |
| ; LINUX: # %bb.0: |
| ; LINUX-NOT: call __chkstk |
| ; LINUX: ret |
| %array128 = alloca [128 x i8], align 16 ; <[128 x i8]*> [#uses=0] |
| ret i32 0 |
| } |
| |
| ; Make sure we don't call __chkstk or __alloca on non-Windows even if the |
| ; caller has the Win64 calling convention. |
| define win64cc i32 @main4k_win64() nounwind { |
| entry: |
| ; WIN_X32: calll __chkstk |
| ; WIN_X64: callq __chkstk |
| ; WIN64_LARGE: movabsq $__chkstk, %r11 |
| ; WIN64_LARGE: callq *%r11 |
| ; MINGW_X32: calll __alloca |
| ; MINGW_X64: callq ___chkstk_ms |
| ; LINUX-NOT: call __chkstk |
| %array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0] |
| ret i32 0 |
| } |
| |
| ; PR30687: Avoid crashing when inserting a __chkstk call at the end of an MBB. |
| define void @dont_crash() { |
| entry: |
| ; WIN_X32: calll __chkstk |
| ; WIN_X64: callq __chkstk |
| ; WIN64_LARGE: movabsq $__chkstk, %r11 |
| ; WIN64_LARGE: callq *%r11 |
| ; MINGW_X32: calll __alloca |
| ; MINGW_X64: callq ___chkstk_ms |
| ; LINUX-NOT: call __chkstk |
| %buffer = alloca [4096 x i8] |
| br label %ret |
| |
| ret: |
| ret void |
| } |