[LLVMdev] Broken PLT on ARM from R183966
Gordon Keiser
gkeiser at arxan.com
Tue Aug 20 18:10:08 PDT 2013
For ARM targets on linux, revision 183966 made Fast ISel default. Unfortunately, Fast ISel is broken in terms of applying the ARMII::MO_PLT flags to calls in PIC mode (at least when emitting assembly); it never does this. The normal ISel pass handles this situation correctly so a temporary local change to disable FastISel for linux / NaCl targets is working for me right now.
I'm not very familiar with the ISel passes. I'm guessing the correct thing to do here would be to apply the attribute correctly in FastISel so it works, but I'm kind of unfamiliar with this part of the code and won't have time to dig into it right now, although I'm willing to do it if someone points me to the right area of code.
In the meantime, would it be worthwhile to submit in a modification to disable FastISel for non-darwin targets, or is it likely to be fixed quickly?
-Gordon
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