tree 5e512b5da7d7c290d69e4437436feb15ccad5ffc
parent 8fff8c66738b35bafc5318e408afa21c34c57ff3
author Serban Constantinescu <serban.constantinescu@arm.com> 1424642881 +0000
committer Serban Constantinescu <serban.constantinescu@arm.com> 1426589271 +0000

Opt Compiler: Materialise constants that cannot be encoded

The VIXL MacroAssembler deals gracefully with any immediate. However
when the constant has multiple uses and cannot be encoded in the
instruction's immediate field we are better off using a register for
the constant and thus sharing the constant generation between multiple
uses.

Eg:
  var += #Const;    // #Const cannot be encoded.
  var += #Const;

Before:                 After:
  mov wip0, #Const        mov w4, #Const
  add w0, w0, wip0        add w0, w0, w4
  mov wip0, #Const        add w0, w0, w4
  add w0, w0, wip0

Change-Id: Ied8577c879845777e52867aced16b2b45e06ac6c
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>