llvm-project

Commit Graph

Author	SHA1	Message	Date
Tim Northover	6c647eae8b	X86: remove temporary atomicrmw used during lowering. We construct a temporary "atomicrmw xchg" instruction when lowering atomic stores for widths that aren't supported natively. This isn't on the top-level worklist though, so it won't be removed automatically and we have to do it ourselves once that itself has been lowered. Thanks Saleem for pointing this out! llvm-svn: 212948	2014-07-14 15:31:13 +00:00
Tim Northover	277066ab43	X86: expand atomics in IR instead of as MachineInstrs. The logic for expanding atomics that aren't natively supported in terms of cmpxchg loops is much simpler to express at the IR level. It also allows the normal optimisations and CodeGen improvements to help out with atomics, instead of using a limited set of possible instructions.. rdar://problem/13496295 llvm-svn: 212119	2014-07-01 18:53:31 +00:00

Author

SHA1

Message

Date

Tim Northover

6c647eae8b

X86: remove temporary atomicrmw used during lowering.

We construct a temporary "atomicrmw xchg" instruction when lowering atomic
stores for widths that aren't supported natively. This isn't on the top-level
worklist though, so it won't be removed automatically and we have to do it
ourselves once that itself has been lowered.

Thanks Saleem for pointing this out!

llvm-svn: 212948

2014-07-14 15:31:13 +00:00

Tim Northover

277066ab43

X86: expand atomics in IR instead of as MachineInstrs.

The logic for expanding atomics that aren't natively supported in
terms of cmpxchg loops is much simpler to express at the IR level. It
also allows the normal optimisations and CodeGen improvements to help
out with atomics, instead of using a limited set of possible
instructions..

rdar://problem/13496295

llvm-svn: 212119

2014-07-01 18:53:31 +00:00

2 Commits