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Author SHA1 Message Date
Diana Picus f53865daa4 [ARM] GlobalISel: Legalize s8 and s16 G_(S|U)DIV 
We have to widen the operands to 32 bits and then we can either use
hardware division if it is available or lower to a libcall otherwise.

At the moment it is not enough to set the Legalizer action to
WidenScalar, since for libcalls it won't know what to do (it won't be
able to find what size to widen to, because it will find Libcall and not
Legal for 32 bits). To hack around this limitation, we request Custom
lowering, and as part of that we widen first and then we run another
legalizeInstrStep on the widened DIV.

llvm-svn: 301166
 2017-04-24 09:12:19 +00:00
Diana Picus 7cab0786bd [ARM] GlobalISel: Use Subtarget in Legalizer 
Start using the Subtarget to make decisions about what's legal. In particular,
we only mark floating point operations as legal if we have VFP2, which is
something we should've done from the very start.

llvm-svn: 295439
 2017-02-17 11:25:17 +00:00
Diana Picus 22274934f4 [ARM] Add plumbing for GlobalISel 
Add GlobalISel skeleton, up to the point where we can select a ret void.

llvm-svn: 286573
 2016-11-11 08:27:37 +00:00