[AArch64] Implement dynamic stack probing for windows

This makes sure that alloca() function calls properly probe the
stack as needed.

Differential Revision: https://reviews.llvm.org/D42356

llvm-svn: 325433

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp b/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
index 360b39125b7..933cd819706 100644
--- a/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64RegisterInfo.cpp
@@ -114,6 +114,10 @@ AArch64RegisterInfo::getThisReturnPreservedMask(const MachineFunction &MF,
   return CSR_AArch64_AAPCS_ThisReturn_RegMask;
 }
 
+const uint32_t *AArch64RegisterInfo::getWindowsStackProbePreservedMask() const {
+  return CSR_AArch64_StackProbe_Windows_RegMask;
+}
+
 BitVector
 AArch64RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   const AArch64FrameLowering *TFI = getFrameLowering(MF);