X86: expand atomics in IR instead of as MachineInstrs.

Description

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

Details

Committed
tnorthoverJul 1 2014, 11:53 AM
Parents
rL212118: Make baseline color more distinguishable
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