Re: Assigning multiple contiguous registers to a virtual register

Thats some good data except I am not sure how general it is esp
considering new languages.


On a different note, if its an architecture without alignment
restrictions, then would it be a possibility to present to the
register allocator a homogeneous virtual register world ? Something
like if x86 could allow AL, BH to be allocated to a 64 bit instead of
(AH, Al)/ AX.


Of course,. register allocator has to be taught how to still consider
contiguous registers.
Is there any existing work along those lines ?




thanks
shrey






On Mar 15, 6:45 pm, Fernando <prone...@gmail.com> wrote:
> Usually we do not see many virtuals with different sizes. I have some
> numbers in here:
>
> http://www2.dcc.ufmg.br/laboratorios/llp/wiki/doku.php?id=benchmarkpz...
>
> This page above talks about register allocation by puzzle solving,
> i.e, we use this abstraction called puzzles:
>
> http://compilers.cs.ucla.edu/fernando/projects/puzzles/tutorial/
>
> If a puzzle has pieces of different sizes, then it means that you are
> using virtuals of different sizes, i.e, 32 and 64-bit floating point
> values, for instance. But most of the floating point benchmarks that I
> know are too homogeneous: either all the pieces are 32-bits, or 64-
> bits.

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