commit 2a78fa5209ad5bf86dd29a9e75d12802ff907495
author Gor Nishanov <GorNishanov@gmail.com> Mon Apr 02 17:35:37 2018 +0000
committer Gor Nishanov <GorNishanov@gmail.com> Mon Apr 02 17:35:37 2018 +0000
tree a14ac5ef8aec21ff6a92d64e3b79a7e1928a60d8
parent 868112181b596ec4f310dc4442e93379d0217bdd

[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

llvm-svn: 328993

clang/include/clang/Basic/Builtins.def

diff --git a/clang/include/clang/Basic/Builtins.def b/clang/include/clang/Basic/Builtins.def
index 36b72ba..b5a1cbc 100644
--- a/clang/include/clang/Basic/Builtins.def
+++ b/clang/include/clang/Basic/Builtins.def
@@ -1391,6 +1391,7 @@
 
 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")

clang/lib/CodeGen/CGBuiltin.cpp

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 79e571c..2692088 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -2796,6 +2796,8 @@
     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:

clang/test/CodeGenCoroutines/coro-builtins.c

diff --git a/clang/test/CodeGenCoroutines/coro-builtins.c b/clang/test/CodeGenCoroutines/coro-builtins.c
index 9ec2147..9800eef 100644
--- a/clang/test/CodeGenCoroutines/coro-builtins.c
+++ b/clang/test/CodeGenCoroutines/coro-builtins.c
@@ -17,6 +17,9 @@
   // 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]])