[PATCH] ARM: Enable DP copy, load and store instructions for FPv4-SP

[Tim Northover]

A common way to get around those issues is to add a temporary option, -arm-enable-dp-sp or whatever, which is off by default while the code is still buggy but can be enabled in tests.

It seems slightly excessive in this case if we're just going to remove it again a few days later, but it would definitely make revision control simpler if anyone does ever need to "git blame" the situation. And it'd make each individual patch easier to review and pair up with its tests (though I'm going to be away for the next week anyway, so if Renato doesn't mind...).

Cheers.

Tim.

http://reviews.llvm.org/D4907