[MS] Add support for __ud2 and __int2c MSVC intrinsics

This was requested in PR31958 and elsewhere.

llvm-svn: 297057

4 files changed, 32 insertions, 3 deletions

diff --git a/clang/include/clang/Basic/BuiltinsX86.def b/clang/include/clang/Basic/BuiltinsX86.def
index 839122c4bba..dc9fb8ab448 100644
--- a/clang/include/clang/Basic/BuiltinsX86.def
+++ b/clang/include/clang/Basic/BuiltinsX86.def
@@ -1829,6 +1829,8 @@ TARGET_HEADER_BUILTIN(__emulu, "ULLiUiUi", "nh", "intrin.h", ALL_MS_LANGUAGES, "
 TARGET_HEADER_BUILTIN(_AddressOfReturnAddress, "v*", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 
 TARGET_HEADER_BUILTIN(__stosb, "vUc*Ucz", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
+TARGET_HEADER_BUILTIN(__int2c, "v",       "nr", "intrin.h", ALL_MS_LANGUAGES, "")
+TARGET_HEADER_BUILTIN(__ud2,   "v",       "nr", "intrin.h", ALL_MS_LANGUAGES, "")
 
 #undef BUILTIN
 #undef TARGET_BUILTIN
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 *);
diff --git a/clang/test/CodeGen/ms-intrinsics.c b/clang/test/CodeGen/ms-intrinsics.c
index 7b03035615e..2d4ca5c272a 100644
--- a/clang/test/CodeGen/ms-intrinsics.c
+++ b/clang/test/CodeGen/ms-intrinsics.c
@@ -28,6 +28,20 @@ void test__stosb(unsigned char *Dest, unsigned char Data, size_t Count) {
 // CHECK-X64:   tail call void @llvm.memset.p0i8.i64(i8* %Dest, i8 %Data, i64 %Count, i32 1, i1 true)
 // CHECK-X64:   ret void
 // CHECK-X64: }
+
+void test__ud2(void) {
+  __ud2();
+}
+// CHECK-INTEL-LABEL: define{{.*}} void @test__ud2()
+// CHECK-INTEL: call void @llvm.trap()
+
+void test__int2c(void) {
+  __int2c();
+}
+// CHECK-INTEL-LABEL: define{{.*}} void @test__int2c()
+// CHECK-INTEL: call void asm sideeffect "int $$0x2c", ""() #[[NORETURN:[0-9]+]]
+
+
 #endif
 
 void *test_ReturnAddress() {
@@ -425,7 +439,7 @@ void test__fastfail() {
 }
 // CHECK-LABEL: define{{.*}} void @test__fastfail()
 // CHECK-ARM: call void asm sideeffect "udf #251", "{r0}"(i32 42) #[[NORETURN:[0-9]+]]
-// CHECK-INTEL: call void asm sideeffect "int $$0x29", "{cx}"(i32 42) #[[NORETURN:[0-9]+]]
+// CHECK-INTEL: call void asm sideeffect "int $$0x29", "{cx}"(i32 42) #[[NORETURN]]
 
 // Attributes come last.