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: I8d1f620872d1241cf582fb4f3b45b5091b790146
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>
2 files changed
