[cfe-commits] [PATCH] Add __builtin_readcyclecounter

[Hal Finkel]

Hello,

Please review this patch which adds a __builtin_readcyclecounter()
intrinsic. LLVM provides i64 @llvm.readcyclecounter(), but clang does
not have a corresponding intrinsic.

Thanks in advance,
Hal

-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory

diff --git a/include/clang/Basic/Builtins.def b/include/clang/Basic/Builtins.def
index 63e8d08..1b060a5 100644
--- a/include/clang/Basic/Builtins.def
+++ b/include/clang/Basic/Builtins.def
@@ -476,6 +476,7 @@ BUILTIN(__builtin___vprintf_chk, "iicC*a", "FP:1:")
 
 BUILTIN(__builtin_expect, "LiLiLi"   , "nc")
 BUILTIN(__builtin_prefetch, "vvC*.", "nc")
+BUILTIN(__builtin_readcyclecounter, "ULLi", "n")
 BUILTIN(__builtin_trap, "v", "nr")
 BUILTIN(__builtin_unreachable, "v", "nr")
 BUILTIN(__builtin_shufflevector, "v."   , "nc")
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index e47a9a3..65c782e 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -365,6 +365,10 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
     Value *F = CGM.getIntrinsic(Intrinsic::prefetch);
     return RValue::get(Builder.CreateCall4(F, Address, RW, Locality, Data));
   }
+  case Builtin::BI__builtin_readcyclecounter: {
+    Value *F = CGM.getIntrinsic(Intrinsic::readcyclecounter);
+    return RValue::get(Builder.CreateCall(F));
+  }
   case Builtin::BI__builtin_trap: {
     Value *F = CGM.getIntrinsic(Intrinsic::trap);
     return RValue::get(Builder.CreateCall(F));
diff --git a/test/CodeGen/builtins.c b/test/CodeGen/builtins.c
index fca087e..65b9ad1 100644
--- a/test/CodeGen/builtins.c
+++ b/test/CodeGen/builtins.c
@@ -203,3 +203,9 @@ void test_builtin_longjmp(void **buffer) {
   __builtin_longjmp(buffer, 1);
   // CHECK-NEXT: unreachable
 }
+
+// CHECK: define i64 @test_builtin_readcyclecounter
+long long test_builtin_readcyclecounter() {
+  // CHECK: call i64 @llvm.readcyclecounter()
+  return __builtin_readcyclecounter();
+}

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