[llvm-commits] [patch] X86FastISel can't handle loads through %fs or %gs

[Nelson Elhage]

This patch causes X86FastIsel to bail out on loads through %fs or %gs
(i.e. address spaces > 255), which lets us fall back to regular isel and
correctly compile loads through those segment registers at -O0.

The addrspace(256) -> %GS feature is still buggy (See PR3966), but this
seems like a strict improvement, and I expect that feature is used
rarely enough that the performance cost of going through regular
instruction selection is probably acceptable.

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