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X86: use the correct alloca symbol for Windows Itanium

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Windows itanium targets the MSVCRT, and the stack probe symbol is provided by
MSVCRT.  This corrects the emission of stack probes on i686-windows-itanium.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222439 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool 2014-11-20 18:01:26 +00:00
parent 12385e603f
commit e6c1fc9a44
3 changed files with 24 additions and 2 deletions
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6
lib/Target/X86/X86ISelLowering.cpp
View File

@ -20609,8 +20609,10 @@ X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
.addReg(X86::RAX);
}
} else {
const char *StackProbeSymbol =
Subtarget->isTargetKnownWindowsMSVC() ? "_chkstk" : "_alloca";
const char *StackProbeSymbol = (Subtarget->isTargetKnownWindowsMSVC() ||
Subtarget->isTargetWindowsItanium())
? "_chkstk"
: "_alloca";
BuildMI(*BB, MI, DL, TII->get(X86::CALLpcrel32))
.addExternalSymbol(StackProbeSymbol)

4
lib/Target/X86/X86Subtarget.h
View File

@ -426,6 +426,10 @@ public:
return TargetTriple.isWindowsGNUEnvironment();
}
bool isTargetWindowsItanium() const {
return TargetTriple.isWindowsItaniumEnvironment();
}
bool isTargetCygMing() const { return TargetTriple.isOSCygMing(); }
bool isOSWindows() const { return TargetTriple.isOSWindows(); }

16
test/CodeGen/X86/windows-itanium-alloca.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llc -mtriple i686-windows-itanium -filetype asm -o - %s | FileCheck %s
target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
target triple = "i686--windows-itanium"
declare void @external(i8*)
define dllexport void @alloca(i32 %sz) {
entry:
%vla = alloca i8, i32 %sz, align 1
call void @external(i8* %vla)
ret void
}
; CHECK: __chkstk