mgrang created this revision.
mgrang added reviewers: rnk, mstorsjo, compnerd, TomTan, haripul.
Herald added a reviewer: javed.absar.
Herald added subscribers: chrib, kristof.beyls.
Repository:
rC Clang
https://reviews.llvm.org/D52838
Files:
include/clang/Basic/BuiltinsAArch64.def
lib/CodeGen/CGBuiltin.cpp
lib/Headers/intrin.h
test/CodeGen/arm64-microsoft-intrinsics.c
Index: test/CodeGen/arm64-microsoft-intrinsics.c
===================================================================
--- test/CodeGen/arm64-microsoft-intrinsics.c
+++ test/CodeGen/arm64-microsoft-intrinsics.c
@@ -66,3 +66,42 @@
// CHECK-MSVC: fence syncscope("singlethread")
// CHECK-LINUX: error: implicit declaration of function '_ReadWriteBarrier'
+
+unsigned __int64 check_getReg() {
+ unsigned volatile __int64 reg;
+ reg = __getReg(0);
+ reg = __getReg(1);
+ reg = __getReg(2);
+ reg = __getReg(3);
+ reg = __getReg(4);
+ reg = __getReg(5);
+ reg = __getReg(6);
+ reg = __getReg(7);
+ reg = __getReg(8);
+ reg = __getReg(9);
+ reg = __getReg(10);
+ reg = __getReg(11);
+ reg = __getReg(12);
+ reg = __getReg(13);
+ reg = __getReg(14);
+ reg = __getReg(15);
+ reg = __getReg(16);
+ reg = __getReg(17);
+ reg = __getReg(18);
+ reg = __getReg(19);
+ reg = __getReg(20);
+ reg = __getReg(21);
+ reg = __getReg(22);
+ reg = __getReg(23);
+ reg = __getReg(24);
+ reg = __getReg(25);
+ reg = __getReg(26);
+ reg = __getReg(27);
+ reg = __getReg(28);
+ reg = __getReg(29);
+ reg = __getReg(30);
+ reg = __getReg(31);
+ return reg;
+}
+
+// CHECK-MSVC: llvm.read_register.i64
Index: lib/Headers/intrin.h
===================================================================
--- lib/Headers/intrin.h
+++ lib/Headers/intrin.h
@@ -865,6 +865,13 @@
#endif
/*----------------------------------------------------------------------------*\
+|* MS AArch64 specific
+\*----------------------------------------------------------------------------*/
+#if defined(__aarch64__)
+unsigned __int64 __getReg(int);
+#endif
+
+/*----------------------------------------------------------------------------*\
|* Privileged intrinsics
\*----------------------------------------------------------------------------*/
#if defined(__i386__) || defined(__x86_64__)
Index: lib/CodeGen/CGBuiltin.cpp
===================================================================
--- lib/CodeGen/CGBuiltin.cpp
+++ lib/CodeGen/CGBuiltin.cpp
@@ -6582,6 +6582,30 @@
return Builder.CreateCall(F, {StoreVal, StoreAddr}, "stxr");
}
+ if (BuiltinID == AArch64::BI__getReg) {
+ APSInt Value;
+ if (!E->getArg(0)->EvaluateAsInt(Value, CGM.getContext()))
+ CGM.Error(E->getArg(0)->getBeginLoc(),
+ "__getReg expects a constant input parameter");
+
+ if (Value < 0 || Value > 31)
+ CGM.Error(E->getArg(0)->getBeginLoc(),
+ "__getReg expects an input parameter between 0 and 31");
+
+ LLVMContext &Context = CGM.getLLVMContext();
+ SmallString<8> StrVal;
+ Value.toString(StrVal);
+ std::string Reg = "x" + std::string(StrVal.c_str());
+
+ llvm::Metadata *Ops[] = {llvm::MDString::get(Context, Reg)};
+ llvm::MDNode *RegName = llvm::MDNode::get(Context, Ops);
+ llvm::Value *Metadata = llvm::MetadataAsValue::get(Context, RegName);
+
+ llvm::Value *F =
+ CGM.getIntrinsic(llvm::Intrinsic::read_register, {Int64Ty});
+ return Builder.CreateCall(F, Metadata);
+ }
+
if (BuiltinID == AArch64::BI__builtin_arm_clrex) {
Function *F = CGM.getIntrinsic(Intrinsic::aarch64_clrex);
return Builder.CreateCall(F);
Index: include/clang/Basic/BuiltinsAArch64.def
===================================================================
--- include/clang/Basic/BuiltinsAArch64.def
+++ include/clang/Basic/BuiltinsAArch64.def
@@ -104,6 +104,7 @@
TARGET_HEADER_BUILTIN(_InterlockedXor64, "LLiLLiD*LLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
TARGET_HEADER_BUILTIN(_ReadWriteBarrier, "v", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
+TARGET_HEADER_BUILTIN(__getReg, "ULLii", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
#undef BUILTIN
#undef LANGBUILTIN
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