[COFF] Add ARM64 intrinsics: __yield, __wfe, __wfi, __sev, __sevl

[mgrang]

Summary

These intrinsics result in hint instructions. They are provided here for MSVC ARM64 compatibility.

[mstorsjo]

LGTM

cfe/trunk/include/clang/Basic/BuiltinsAArch64.def

 // System Registers
 BUILTIN(__builtin_arm_rsr, "UicC*", "nc")
 BUILTIN(__builtin_arm_rsr64, "LUicC*", "nc")
 BUILTIN(__builtin_arm_rsrp, "v*cC*", "nc")
 BUILTIN(__builtin_arm_wsr, "vcC*Ui", "nc")
 BUILTIN(__builtin_arm_wsr64, "vcC*LUi", "nc")
 BUILTIN(__builtin_arm_wsrp, "vcC*vC*", "nc")
 
+// MSVC
 LANGBUILTIN(__dmb, "vUi", "nc", ALL_MS_LANGUAGES)
 LANGBUILTIN(__dsb, "vUi", "nc", ALL_MS_LANGUAGES)
 LANGBUILTIN(__isb, "vUi", "nc", ALL_MS_LANGUAGES)
+LANGBUILTIN(__yield, "v", "",   ALL_MS_LANGUAGES)
+LANGBUILTIN(__wfe,   "v", "",   ALL_MS_LANGUAGES)
+LANGBUILTIN(__wfi,   "v", "",   ALL_MS_LANGUAGES)
+LANGBUILTIN(__sev,   "v", "",   ALL_MS_LANGUAGES)
+LANGBUILTIN(__sevl,  "v", "",   ALL_MS_LANGUAGES)
 
 // MSVC intrinsics for volatile but non-acquire/release loads and stores
 LANGBUILTIN(__iso_volatile_load8,   "ccCD*",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_load16,  "ssCD*",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_load32,  "iiCD*",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_load64,  "LLiLLiCD*", "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_store8,  "vcD*c",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_store16, "vsD*s",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_store32, "viD*i",     "n", ALL_MS_LANGUAGES)
 LANGBUILTIN(__iso_volatile_store64, "vLLiD*LLi", "n", ALL_MS_LANGUAGES)
 
 #undef BUILTIN
 #undef LANGBUILTIN

cfe/trunk/lib/CodeGen/CGBuiltin.cpp

Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
                                                llvm::Triple::ArchType Arch) {
   unsigned HintID = static_cast<unsigned>(-1);
   switch (BuiltinID) {
   default: break;
   case AArch64::BI__builtin_arm_nop:
     HintID = 0;
     break;
   case AArch64::BI__builtin_arm_yield:
+  case AArch64::BI__yield:
     HintID = 1;
     break;
   case AArch64::BI__builtin_arm_wfe:
+  case AArch64::BI__wfe:
     HintID = 2;
     break;
   case AArch64::BI__builtin_arm_wfi:
+  case AArch64::BI__wfi:
     HintID = 3;
     break;
   case AArch64::BI__builtin_arm_sev:
+  case AArch64::BI__sev:
     HintID = 4;
     break;
   case AArch64::BI__builtin_arm_sevl:
+  case AArch64::BI__sevl:
     HintID = 5;
     break;
   }
 
   if (HintID != static_cast<unsigned>(-1)) {
     Function *F = CGM.getIntrinsic(Intrinsic::aarch64_hint);
     return Builder.CreateCall(F, llvm::ConstantInt::get(Int32Ty, HintID));
   }

cfe/trunk/test/CodeGen/arm64-microsoft-intrinsics.c

 // CHECK-LINUX: error: implicit declaration of function '__dsb'
 
 void check__isb(void) {
   __isb(0);
 }
 
 // CHECK-MSVC: @llvm.aarch64.isb(i32 0)
 // CHECK-LINUX: error: implicit declaration of function '__isb'
+
+void check__yield(void) {
+  __yield();
+}
+
+// CHECK-MSVC: @llvm.aarch64.hint(i32 1)
+// CHECK-LINUX: error: implicit declaration of function '__yield'
+
+void check__wfe(void) {
+  __wfe();
+}
+
+// CHECK-MSVC: @llvm.aarch64.hint(i32 2)
+// CHECK-LINUX: error: implicit declaration of function '__wfe'
+
+void check__wfi(void) {
+  __wfi();
+}
+
+// CHECK-MSVC: @llvm.aarch64.hint(i32 3)
+// CHECK-LINUX: error: implicit declaration of function '__wfi'
+
+void check__sev(void) {
+  __sev();
+}
+
+// CHECK-MSVC: @llvm.aarch64.hint(i32 4)
+// CHECK-LINUX: error: implicit declaration of function '__sev'
+
+void check__sevl(void) {
+  __sevl();
+}
+
+// CHECK-MSVC: @llvm.aarch64.hint(i32 5)
+// CHECK-LINUX: error: implicit declaration of function '__sevl'