[cfe-commits] [PATCH] ARM strexd and ldrexd intrinsics

[Bruno Cardoso Lopes]

Hi,

Add support for ARM ldrexd/strexd intrinsics. ldrexd and strexd both
use register pairs to load/store i64 values. The register pair
constraint specifies that the first register should be even and the
second the following odd. Teach the pre-regalloc LoadStoreOptimizer to
use register allocator hints to respect the constraint and teach the
post-reagalloc to fix the pair (with a very conservative approach)
when the hint fails. A testcase is also present.

OK to commit?

-- 
Bruno Cardoso Lopes
http://www.brunocardoso.cc
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