[GlobalISel] Add IRTranslator support for llvm.stacksave and llvm.stackrestore

Also update arm64-irtranslator.ll.

Differential Revision: https://reviews.llvm.org/D60140

llvm-svn: 357538

1 files changed, 28 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 8528636a67d..f60f7845655 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1046,6 +1046,34 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
                                   PtrTy.getSizeInBits() / 8, 8));
     return true;
   }
+  case Intrinsic::stacksave: {
+    // Save the stack pointer to the location provided by the intrinsic.
+    unsigned Reg = getOrCreateVReg(CI);
+    unsigned StackPtr = MF->getSubtarget()
+                            .getTargetLowering()
+                            ->getStackPointerRegisterToSaveRestore();
+
+    // If the target doesn't specify a stack pointer, then fall back.
+    if (!StackPtr)
+      return false;
+
+    MIRBuilder.buildCopy(Reg, StackPtr);
+    return true;
+  }
+  case Intrinsic::stackrestore: {
+    // Restore the stack pointer from the location provided by the intrinsic.
+    unsigned Reg = getOrCreateVReg(*CI.getArgOperand(0));
+    unsigned StackPtr = MF->getSubtarget()
+                            .getTargetLowering()
+                            ->getStackPointerRegisterToSaveRestore();
+
+    // If the target doesn't specify a stack pointer, then fall back.
+    if (!StackPtr)
+      return false;
+
+    MIRBuilder.buildCopy(StackPtr, Reg);
+    return true;
+  }
   case Intrinsic::cttz:
   case Intrinsic::ctlz: {
     ConstantInt *Cst = cast<ConstantInt>(CI.getArgOperand(1));