[coroutines] Add __builtin_coro_noop => llvm.coro.noop

A recent addition to Coroutines TS (https://wg21.link/p0913) adds a pre-defined
coroutine noop_coroutine that does nothing. To implement this feature, we implemented
an llvm.coro.noop intrinsic that returns a coroutine handle to a coroutine that
does nothing when resumed or destroyed.

This patch adds a builtin __builtin_coro_noop() that maps to llvm.coro.noop intrinsic.

Related llvm change: https://reviews.llvm.org/D45114

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@328993 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/Builtins.def b/include/clang/Basic/Builtins.def
index 36b72ba385bcf91372601011c1890ba1b609a2d0..b5a1cbc9c710783634fbada0f2e13f045da85277 100644 (file)
--- a/include/clang/Basic/Builtins.def
+++ b/include/clang/Basic/Builtins.def
@@ -1391,6 +1391,7 @@ BUILTIN(__builtin_coro_promise, "v*v*IiIb", "n")
 
 BUILTIN(__builtin_coro_size, "z", "n")
 BUILTIN(__builtin_coro_frame, "v*", "n")
+BUILTIN(__builtin_coro_noop, "v*", "n")
 BUILTIN(__builtin_coro_free, "v*v*", "n")
 
 BUILTIN(__builtin_coro_id, "v*Iiv*v*v*", "n")

diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index 79e571c2a6e74ec1e985d199a47202b93317be2d..2692088d6b2092f94b6a7255584e8ad4028828f4 100644 (file)
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -2796,6 +2796,8 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
     return EmitCoroutineIntrinsic(E, Intrinsic::coro_resume);
   case Builtin::BI__builtin_coro_frame:
     return EmitCoroutineIntrinsic(E, Intrinsic::coro_frame);
+  case Builtin::BI__builtin_coro_noop:
+    return EmitCoroutineIntrinsic(E, Intrinsic::coro_noop);
   case Builtin::BI__builtin_coro_free:
     return EmitCoroutineIntrinsic(E, Intrinsic::coro_free);
   case Builtin::BI__builtin_coro_destroy:

diff --git a/test/CodeGenCoroutines/coro-builtins.c b/test/CodeGenCoroutines/coro-builtins.c
index 9ec2147642588e8fa1d2f1c6321cbbc1639a0f73..9800eef0ed819c47bed6cc3706078d12cca78444 100644 (file)
--- a/test/CodeGenCoroutines/coro-builtins.c
+++ b/test/CodeGenCoroutines/coro-builtins.c
@@ -17,6 +17,9 @@ void f(int n) {
   // CHECK-NEXT: call i1 @llvm.coro.alloc(token %[[COROID]])
   __builtin_coro_alloc();
 
+  // CHECK-NEXT: call i8* @llvm.coro.noop()
+  __builtin_coro_noop();
+
   // CHECK-NEXT: %[[SIZE:.+]] = call i64 @llvm.coro.size.i64()
   // CHECK-NEXT: %[[MEM:.+]] = call i8* @myAlloc(i64 %[[SIZE]])
   // CHECK-NEXT: %[[FRAME:.+]] = call i8* @llvm.coro.begin(token %[[COROID]], i8* %[[MEM]])