Revert "GlobalISel: Handle llvm.read_register"

This reverts commit r373294. It broke Clang's
CodeGen/arm64-microsoft-status-reg.cpp:
http://lab.llvm.org:8011/builders/clang-x86_64-debian-fast/builds/18483

llvm-svn: 373310

1 files changed, 0 insertions, 15 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index e1cfb96e13c..37ac96e5290 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1523,21 +1523,6 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
   case Intrinsic::sideeffect:
     // Discard annotate attributes, assumptions, and artificial side-effects.
     return true;
-  case Intrinsic::read_register: {
-    Value *Arg = CI.getArgOperand(0);
-    const Metadata *MD = cast<MetadataAsValue>(Arg)->getMetadata();
-    const MDString *RegStr = cast<MDString>(cast<MDNode>(MD)->getOperand(0));
-
-    auto *TLI = MF->getSubtarget().getTargetLowering();
-    Register Dst = getOrCreateVReg(CI);
-    EVT VT = TLI->getValueType(*DL, CI.getType());
-    Register Reg = TLI->getRegisterByName(RegStr->getString().data(), VT, *MF);
-    if (!Reg.isValid())
-      return false;
-
-    MIRBuilder.buildCopy(Dst, Reg);
-    return true;
-  }
   }
   return false;
 }