From: Mandeep Singh Grang <mgrang@codeaurora.org>
Date: Fri, 5 Oct 2018 21:57:41 +0000 (+0000)
Subject: [COFF, ARM64] Add _InterlockedAdd intrinsic
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=339ff47af8084b99b9968f078e66f62d6adfafab;p=clang

[COFF, ARM64] Add _InterlockedAdd intrinsic

Reviewers: rnk, mstorsjo, compnerd, TomTan, haripul, javed.absar, efriedma

Reviewed By: efriedma

Subscribers: efriedma, kristof.beyls, chrib, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D52811

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@343894 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/BuiltinsAArch64.def b/include/clang/Basic/BuiltinsAArch64.def
index 2b6fcdabdc..49bf8313df 100644
--- a/include/clang/Basic/BuiltinsAArch64.def
+++ b/include/clang/Basic/BuiltinsAArch64.def
@@ -94,6 +94,7 @@ TARGET_HEADER_BUILTIN(_BitScanReverse, "UcUNi*UNi", "nh", "intrin.h", ALL_MS_LAN
 TARGET_HEADER_BUILTIN(_BitScanForward64, "UcUNi*ULLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_BitScanReverse64, "UcUNi*ULLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 
+TARGET_HEADER_BUILTIN(_InterlockedAdd,           "LiLiD*Li",    "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_InterlockedAnd64,         "LLiLLiD*LLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_InterlockedDecrement64,   "LLiLLiD*",    "nh", "intrin.h", ALL_MS_LANGUAGES, "")
 TARGET_HEADER_BUILTIN(_InterlockedExchange64,    "LLiLLiD*LLi", "nh", "intrin.h", ALL_MS_LANGUAGES, "")
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 8e23b22f78..18b300bf11 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -8517,6 +8517,15 @@ Value *CodeGenFunction::EmitAArch64BuiltinExpr(unsigned BuiltinID,
     return EmitMSVCBuiltinExpr(MSVCIntrin::_InterlockedDecrement, E);
   case AArch64::BI_InterlockedIncrement64:
     return EmitMSVCBuiltinExpr(MSVCIntrin::_InterlockedIncrement, E);
+
+  case AArch64::BI_InterlockedAdd: {
+    Value *Arg0 = EmitScalarExpr(E->getArg(0));
+    Value *Arg1 = EmitScalarExpr(E->getArg(1));
+    AtomicRMWInst *RMWI = Builder.CreateAtomicRMW(
+      AtomicRMWInst::Add, Arg0, Arg1,
+      llvm::AtomicOrdering::SequentiallyConsistent);
+    return Builder.CreateAdd(RMWI, Arg1);
+  }
   }
 }
 
diff --git a/lib/Headers/intrin.h b/lib/Headers/intrin.h
index c5b4ff4d7d..6f753ba125 100644
--- a/lib/Headers/intrin.h
+++ b/lib/Headers/intrin.h
@@ -869,6 +869,7 @@ __nop(void) {
 \*----------------------------------------------------------------------------*/
 #if defined(__aarch64__)
 unsigned __int64 __getReg(int);
+long _InterlockedAdd(long volatile *Addend, long Value);
 #endif
 
 /*----------------------------------------------------------------------------*\
diff --git a/test/CodeGen/arm64-microsoft-intrinsics.c b/test/CodeGen/arm64-microsoft-intrinsics.c
index c8516079eb..eeb09e8972 100644
--- a/test/CodeGen/arm64-microsoft-intrinsics.c
+++ b/test/CodeGen/arm64-microsoft-intrinsics.c
@@ -4,6 +4,16 @@
 // RUN: not %clang_cc1 -triple arm64-linux -Werror -S -o /dev/null %s 2>&1 \
 // RUN:    | FileCheck %s -check-prefix CHECK-LINUX
 
+long test_InterlockedAdd(long volatile *Addend, long Value) {
+  return _InterlockedAdd(Addend, Value);
+}
+
+// CHECK-LABEL: define {{.*}} i32 @test_InterlockedAdd(i32* %Addend, i32 %Value) {{.*}} {
+// CHECK-MSVC: %[[OLDVAL:[0-9]+]] = atomicrmw add i32* %1, i32 %2 seq_cst
+// CHECK-MSVC: %[[NEWVAL:[0-9]+]] = add i32 %[[OLDVAL:[0-9]+]], %2
+// CHECK-MSVC: ret i32 %[[NEWVAL:[0-9]+]]
+// CHECK-LINUX: error: implicit declaration of function '_InterlockedAdd'
+
 void check__dmb(void) {
   __dmb(0);
 }