[MS] Add support for __ud2 and __int2c MSVC intrinsics

This was requested in PR31958 and elsewhere.

llvm-svn: 297057

2 files changed, 15 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 19b9c9b1d59..1c7ee2e6d49 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -7982,6 +7982,21 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
     // instruction, but it will create a memset that won't be optimized away.
     return Builder.CreateMemSet(Ops[0], Ops[1], Ops[2], 1, true);
   }
+  case X86::BI__ud2:
+    // llvm.trap makes a ud2a instruction on x86.
+    return EmitTrapCall(Intrinsic::trap);
+  case X86::BI__int2c: {
+    // This syscall signals a driver assertion failure in x86 NT kernels.
+    llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
+    llvm::InlineAsm *IA =
+        llvm::InlineAsm::get(FTy, "int $$0x2c", "", /*SideEffects=*/true);
+    llvm::AttributeSet NoReturnAttr =
+        AttributeSet::get(getLLVMContext(), llvm::AttributeSet::FunctionIndex,
+                          llvm::Attribute::NoReturn);
+    CallSite CS = Builder.CreateCall(IA);
+    CS.setAttributes(NoReturnAttr);
+    return CS.getInstruction();
+  }
   }
 }
 
diff --git a/clang/lib/Headers/intrin.h b/clang/lib/Headers/intrin.h
index 930d46552f4..af87914a9a0 100644
--- a/clang/lib/Headers/intrin.h
+++ b/clang/lib/Headers/intrin.h
@@ -79,7 +79,6 @@ void __incfsdword(unsigned long);
 void __incfsword(unsigned long);
 unsigned long __indword(unsigned short);
 void __indwordstring(unsigned short, unsigned long *, unsigned long);
-void __int2c(void);
 void __invlpg(void *);
 unsigned short __inword(unsigned short);
 void __inwordstring(unsigned short, unsigned short *, unsigned long);
@@ -141,7 +140,6 @@ void __svm_stgi(void);
 void __svm_vmload(size_t);
 void __svm_vmrun(size_t);
 void __svm_vmsave(size_t);
-void __ud2(void);
 unsigned __int64 __ull_rshift(unsigned __int64, int);
 void __vmx_off(void);
 void __vmx_vmptrst(unsigned __int64 *);