6 Commits

Author	SHA1	Message	Date
Joe Groff	7b2a6e5e8d	IRGen: Emit the "done" check for Builtin.once inline. ... This matches how dispatch_once works in C, dramatically cutting the cost of a global accessor by avoiding the runtime call in the hot path and giving the global a unique branch for the CPU to predict away. For now, only do this for Darwin; non-ObjC platforms don't necessarily expose their "done" value as ABI like ours do. While we're here, change "once" to take a thin function pointer. We don't ever emit global initializers with context dependencies, and this simplifies the runtime glue between swift_once and dispatch_once/std::call_once a bit. Swift SVN r28166	2015-05-05 15:35:57 +00:00
Graham Batty	eba89b15fe	Implemented swift_once with C++11 call_once. ... Swift SVN r22972	2014-10-27 17:16:26 +00:00
Dmitri Hrybenko	c2d80c2589	Change swift_once_t to be actually pointer-sized on non-Darwin ... Swift SVN r22384	2014-09-30 13:19:16 +00:00
Dmitri Hrybenko	0197e15a0e	Runtime: untie swift_once from libdispatch ... <rdar://problem/18499385> [Linux] Implement swift_once Swift SVN r22383	2014-09-30 12:02:15 +00:00
Dave Zarzycki	a85b2a3d78	Runtime: Rename Alloc.* to HeapObject.* (NFC) ... Swift SVN r14228	2014-02-21 20:12:07 +00:00
Joe Groff	562e2bfff6	Runtime: Add swift_once function. ... For now, just shim over dispatch_once. Swift SVN r10514	2013-11-16 03:11:17 +00:00