[COFF, ARM64] Add __break intrinsic

https://docs.microsoft.com/en-us/cpp/intrinsics/arm64-intrinsics?view=msvc-170

Reviewed By: rnk, mstorsjo

Differential Revision: https://reviews.llvm.org/D124032

3 files changed, 14 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 464dcc2..fc2d32f 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -9823,6 +9823,15 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return Builder.CreateCall(F, Metadata);
   }
 
+  if (BuiltinID == AArch64::BI__break) {
+    Expr::EvalResult Result;
+    if (!E->getArg(0)->EvaluateAsInt(Result, CGM.getContext()))
+      llvm_unreachable("Sema will ensure that the parameter is constant");
+
+    llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::aarch64_break);
+    return Builder.CreateCall(F, {EmitScalarExpr(E->getArg(0))});
+  }
+
   if (BuiltinID == AArch64::BI__builtin_arm_clrex) {
     Function *F = CGM.getIntrinsic(Intrinsic::aarch64_clrex);
     return Builder.CreateCall(F);
diff --git a/clang/lib/Headers/intrin.h b/clang/lib/Headers/intrin.h
index 741b21e..07fcae3 100644
--- a/clang/lib/Headers/intrin.h
+++ b/clang/lib/Headers/intrin.h
@@ -560,6 +560,8 @@ unsigned __int64 __cdecl _byteswap_uint64(unsigned __int64 val);
 
 __int64 __mulh(__int64 __a, __int64 __b);
 unsigned __int64 __umulh(unsigned __int64 __a, unsigned __int64 __b);
+
+void __break(int);
 #endif
 
 /*----------------------------------------------------------------------------*\
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index f575c07..467edd3 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -2948,6 +2948,9 @@ bool Sema::CheckAArch64BuiltinFunctionCall(const TargetInfo &TI,
   if (BuiltinID == AArch64::BI__getReg)
     return SemaBuiltinConstantArgRange(TheCall, 0, 0, 31);
 
+  if (BuiltinID == AArch64::BI__break)
+    return SemaBuiltinConstantArgRange(TheCall, 0, 0, 0xffff);
+
   if (CheckNeonBuiltinFunctionCall(TI, BuiltinID, TheCall))
     return true;