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Target/X86: [PR8777][PR8778] Tweak alloca/chkstk for Windows targets.

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FIXME: Some cleanups would be needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi
2011-03-24 07:07:00 +00:00
parent c37c539944
commit a2e0762fae
5 changed files with 183 additions and 64 deletions
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74
test/CodeGen/X86/win64_alloca_dynalloca.ll Normal file
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@@ -0,0 +1,74 @@
; RUN: llc < %s -mtriple=x86_64-mingw32 | FileCheck %s -check-prefix=M64
; RUN: llc < %s -mtriple=x86_64-win32 | FileCheck %s -check-prefix=W64
; RUN: llc < %s -mtriple=x86_64-win32-macho | FileCheck %s -check-prefix=EFI
; PR8777
; PR8778
define i64 @foo(i64 %n, i64 %x) nounwind {
entry:
%buf0 = alloca i8, i64 4096, align 1
; ___chkstk must adjust %rsp.
; M64: movq %rsp, %rbp
; M64: $4096, %rax
; M64: callq ___chkstk
; M64-NOT: %rsp
; __chkstk does not adjust %rsp.
; W64: movq %rsp, %rbp
; W64: $4096, %rax
; W64: callq __chkstk
; W64: subq $4096, %rsp
; Freestanding
; EFI: movq %rsp, %rbp
; EFI: $[[B0OFS:4096|4104]], %rsp
; EFI-NOT: call
%buf1 = alloca i8, i64 %n, align 1
; M64: leaq 15(%rcx), %rax
; M64: andq $-16, %rax
; M64: callq ___chkstk
; M64-NOT: %rsp
; M64: movq %rsp, %rax
; W64: leaq 15(%rcx), %rax
; W64: andq $-16, %rax
; W64: callq __chkstk
; W64: subq %rax, %rsp
; W64: movq %rsp, %rax
; EFI: leaq 15(%rcx), %rax
; EFI: andq $-16, %rax
; EFI: movq %rsp, [[R64:%r..]]
; EFI: subq %rax, [[R64]]
; EFI: movq [[R64]], %rsp
%r = call i64 @bar(i64 %n, i64 %x, i64 %n, i8* %buf0, i8* %buf1) nounwind
; M64: subq $48, %rsp
; M64: leaq -4096(%rbp), %r9
; M64: movq %rax, 32(%rsp)
; M64: callq bar
; W64: subq $48, %rsp
; W64: leaq -4096(%rbp), %r9
; W64: movq %rax, 32(%rsp)
; W64: callq bar
; EFI: subq $48, %rsp
; EFI: leaq -[[B0OFS]](%rbp), %r9
; EFI: movq [[R64]], 32(%rsp)
; EFI: callq _bar
ret i64 %r
; M64: movq %rbp, %rsp
; W64: movq %rbp, %rsp
}
declare i64 @bar(i64, i64, i64, i8* nocapture, i8* nocapture) nounwind

3
test/CodeGen/X86/win_chkstk.ll
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@@ -3,6 +3,7 @@
; 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
@@ -16,7 +17,7 @@ entry:
; WIN_X32: calll __chkstk
; WIN_X64: callq __chkstk
; MINGW_X32: calll __alloca
; MINGW_X64: callq __chkstk
; MINGW_X64: callq ___chkstk
; LINUX-NOT: call __chkstk
%array4096 = alloca [4096 x i8], align 16 ; <[4096 x i8]*> [#uses=0]
ret i32 0