derek.holloway
7502bf64a4
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85 lines
2.9 KiB
LLVM
85 lines
2.9 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-win32 | FileCheck %s -check-prefix=WIN_X32
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; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN_X64
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; RUN: llc < %s -mtriple=x86_64-pc-win32 -code-model=large | FileCheck %s -check-prefix=WIN64_LARGE
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; RUN: llc < %s -mtriple=x86_64-uefi | FileCheck %s -check-prefix=WIN_X64
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; RUN: llc < %s -mtriple=x86_64-uefi -code-model=large | FileCheck %s -check-prefix=WIN64_LARGE
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; RUN: llc < %s -mtriple=i686-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X32
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; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=MINGW_X64
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; RUN: llc < %s -mtriple=i386-pc-linux | FileCheck %s -check-prefix=LINUX
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; RUN: llc < %s -mtriple=x86_64-pc-win32-macho | FileCheck %s -check-prefix=LINUX
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; Windows and mingw require a prologue helper routine if more than 4096 bytes area
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; allocated on the stack. Windows uses __chkstk and mingw uses __alloca. __alloca
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; and the 32-bit version of __chkstk will probe the stack and adjust the stack pointer.
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; The 64-bit version of __chkstk is only responsible for probing the stack. The 64-bit
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; prologue is responsible for adjusting the stack pointer.
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; Stack allocation >= 4096 bytes will require call to __chkstk in the Windows ABI.
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define i32 @main4k() nounwind {
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entry:
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; WIN_X32: calll __chkstk
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; WIN_X64: callq __chkstk
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; WIN64_LARGE: movabsq $__chkstk, %r11
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; WIN64_LARGE: callq *%r11
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; MINGW_X32: calll __alloca
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; MINGW_X64: callq ___chkstk_ms
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; LINUX-NOT: call __chkstk
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%array4096 = alloca [4096 x i8], align 16 ; <ptr> [#uses=0]
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ret i32 0
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}
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; Make sure we don't call __chkstk or __alloca when we have less than a 4096 stack
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; allocation.
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define i32 @main128() nounwind {
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entry:
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; WIN_X32: # %bb.0:
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; WIN_X32-NOT: calll __chkstk
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; WIN_X32: ret
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; WIN_X64: # %bb.0:
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; WIN_X64-NOT: callq __chkstk
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; WIN_X64: ret
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; MINGW_X64: # %bb.0:
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; MINGW_X64-NOT: callq ___chkstk_ms
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; MINGW_X64: ret
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; LINUX: # %bb.0:
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; LINUX-NOT: call __chkstk
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; LINUX: ret
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%array128 = alloca [128 x i8], align 16 ; <ptr> [#uses=0]
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ret i32 0
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}
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; Make sure we don't call __chkstk or __alloca on non-Windows even if the
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; caller has the Win64 calling convention.
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define win64cc i32 @main4k_win64() nounwind {
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entry:
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; WIN_X32: calll __chkstk
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; WIN_X64: callq __chkstk
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; WIN64_LARGE: movabsq $__chkstk, %r11
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; WIN64_LARGE: callq *%r11
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; MINGW_X32: calll __alloca
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; MINGW_X64: callq ___chkstk_ms
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; LINUX-NOT: call __chkstk
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%array4096 = alloca [4096 x i8], align 16 ; <ptr> [#uses=0]
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ret i32 0
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}
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; PR30687: Avoid crashing when inserting a __chkstk call at the end of an MBB.
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define void @dont_crash() {
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entry:
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; WIN_X32: calll __chkstk
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; WIN_X64: callq __chkstk
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; WIN64_LARGE: movabsq $__chkstk, %r11
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; WIN64_LARGE: callq *%r11
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; MINGW_X32: calll __alloca
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; MINGW_X64: callq ___chkstk_ms
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; LINUX-NOT: call __chkstk
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%buffer = alloca [4096 x i8]
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br label %ret
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ret:
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ret void
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}
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