Add llvm.xcore.waitevent intrinsic. The effect of this intrinsic is to enable

events on the thread and wait until a resource is ready to event. The vector
of the resource that is ready is returned.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126320 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/XCore/events.ll

@@ -0,0 +1,21 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+
+declare void @llvm.xcore.setv.p1i8(i8 addrspace(1)* %r, i8* %p)
+declare i8* @llvm.xcore.waitevent()
+
+define i32 @f(i8 addrspace(1)* %r) nounwind {
+; CHECK: f:
+entry:
+  call void @llvm.xcore.setv.p1i8(i8 addrspace(1)* %r, i8* blockaddress(@f, %L1))
+  call void @llvm.xcore.setv.p1i8(i8 addrspace(1)* %r, i8* blockaddress(@f, %L2))
+  %goto_addr = call i8* @llvm.xcore.waitevent()
+; CHECK: waiteu
+  indirectbr i8* %goto_addr, [label %L1, label %L2]
+L1:
+  br label %ret
+L2:
+  br label %ret
+ret:
+  %retval = phi i32 [1, %L1], [2, %L2]
+  ret i32 %retval
+}