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Author SHA1 Message Date
Tim Northover 0e6afbdd77 GlobalISel: legalize G_INSERT instructions 
We don't handle all cases yet (see arm64-fallback.ll for an example), but this
is enough to cover most common C++ code so it's a good place to start.

llvm-svn: 294247
 2017-02-06 21:56:47 +00:00
Kristof Beyls 65a12c012f [GlobalISel] Add support for indirectbr 
Differential Revision: https://reviews.llvm.org/D28079

llvm-svn: 293470
 2017-01-30 09:13:18 +00:00
Quentin Colombet 24203cf997 [AArch64][LegalizerInfo] Specify the type of the opcode. 
This is an attempt to fix the win7 bot that does not seem to be very
good at infering the type when it gets used in an initiliazer list.

llvm-svn: 293246
 2017-01-27 01:13:30 +00:00
Quentin Colombet e15e460c05 Revert "[AArch64][LegalizerInfo] Specify the type of the initialization list." 
This reverts commit r293238.
Even with that the win7 bot is still failing:
http://lab.llvm.org:8011/builders/lld-x86_64-win7/builds/3862

llvm-svn: 293245
 2017-01-27 01:13:25 +00:00
Quentin Colombet 86fc8305ec [AArch64][LegalizerInfo] Specify the type of the initialization list. 
This is an attempt to fix the win7 bot that does not seem to be very
good at infering the type.

llvm-svn: 293238
 2017-01-27 00:39:03 +00:00
Ahmed Bougacha b6137063eb [AArch64][GlobalISel] Legalize narrow scalar fp->int conversions. 
Since we're now avoiding operations using narrow scalar integer types,
we have to legalize the integer side of the FP conversions.

This requires teaching the legalizer how to do that.

llvm-svn: 292828
 2017-01-23 21:10:14 +00:00
Ahmed Bougacha cfb384d39d [AArch64][GlobalISel] Legalize narrow scalar ops again. 
Since r279760, we've been marking as legal operations on narrow integer
types that have wider legal equivalents (for instance, G_ADD s8).
Compared to legalizing these operations, this reduced the amount of
extends/truncates required, but was always a weird legalization decision
made at selection time.

So far, we haven't been able to formalize it in a way that permits the
selector generated from SelectionDAG patterns to be sufficient.

Using a wide instruction (say, s64), when a narrower instruction exists
(s32) would introduce register class incompatibilities (when one narrow
generic instruction is selected to the wider variant, but another is
selected to the narrower variant).

It's also impractical to limit which narrow operations are matched for
which instruction, as restricting "narrow selection" to ranges of types
clashes with potentially incompatible instruction predicates.

Concerns were also raised regarding  MIPS64's sign-extended register
assumptions, as well as wrapping behavior.
See discussions in https://reviews.llvm.org/D26878.

Instead, legalize the operations.

Should we ever revert to selecting these narrow operations, we should
try to represent this more accurately: for instance, by separating
a "concrete" type on operations, and an "underlying" type on vregs, we
could move the "this narrow-looking op is really legal" decision to the
legalizer, and let the selector use the "underlying" vreg type only,
which would be guaranteed to map to a register class.

In any case, we eventually should mitigate:
- the performance impact by selecting no-op extract/truncates to COPYs
  (which we currently do), and the COPYs to register reuses (which we
  don't do yet).
- the compile-time impact by optimizing away extract/truncate sequences
  in the legalizer.

llvm-svn: 292827
 2017-01-23 21:10:05 +00:00
Ahmed Bougacha d294823930 [AArch64][GlobalISel] Widen scalar int->fp conversions. 
It's incorrect to ignore the higher bits of the integer source.
Teach the legalizer how to widen it.

llvm-svn: 292563
 2017-01-20 01:37:24 +00:00
Kristof Beyls e9412b4d47 [GlobalISel] Pointers are legal operands for G_SELECT on AArch64 
Differential Revision: https://reviews.llvm.org/D28805

llvm-svn: 292481
 2017-01-19 13:32:14 +00:00
Tim Northover 037af52c8b GlobalISel: allow truncating pointer casts on AArch64. 
llvm-svn: 285615
 2016-10-31 18:31:09 +00:00
Tim Northover 69fa84a6e9 GlobalISel: rename legalizer components to match others. 
The previous names were both misleading (the MachineLegalizer actually
contained the info tables) and inconsistent with the selector & translator (in
having a "Machine") prefix. This should make everything sensible again.

The only functional change is the name of a couple of command-line options.

llvm-svn: 284287
 2016-10-14 22:18:18 +00:00