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My only concern would be whether or not we should make your change somehow conditional on whether or not the target abi uses function descriptors. It'd be a shame to pessimize all those embedded targets which don't have to deal with such hair.
Jakub also expressed this viewpoint. However, it's just not clear to me how much this actually pessimizes embedded targets. I think the only code that actually needs to test the least significant bits of function pointers is ABI/runtime specific.
-- Mark Mitchell CodeSourcery mark@codesourcery.com (650) 331-3385 x713
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