X86: use the correct alloca symbol for Windows Itanium

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

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index a904e51026869ab4785d9b5b109ca271f3c7c613..8979b9e22a8dae7d85eb19a65d26d6636ff61fe5 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -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)

diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index 8ce553d70926ed30058cf8dac768ef3fccc364c6..091b6c4fbbda4dca2e480fb1c516d22b6280696b 100644 (file)
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -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(); }

diff --git a/test/CodeGen/X86/windows-itanium-alloca.ll b/test/CodeGen/X86/windows-itanium-alloca.ll
new file mode 100644 (file)
index 0000000..0a06cde
--- /dev/null
+++ b/test/CodeGen/X86/windows-itanium-alloca.ll
@@ -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
+