[Mono-devel-list] [mini] 64bit mini patch

[Laurent Morichetti]

Hi,

Attached is a patch to get mini up on 64bit platforms. I also tested it on
x86 and did not see any performance/tests degradation with it applied.
Here's how it works:

In order to track the registers that might contain a pointer, I added a new
non-terminal "regp". All the rules that consume/produce pointers are now
using this new non-terminal instead of the regular "reg". I also added a new
opcode (OP_REGPTR) for physical registers and OP_PCALL for a call that
returns a pointer.

On ILP32 platforms there is a direct equivalence between "reg" and "regp"
regp: reg "0"
reg: regp "0"

On LP64 platforms there is a direct equivalence between "lreg" and "regp"
and a conversion rule for "regp" promotion from "reg" (sign extension)
lreg: regp "0"
regp: lreg "0"
regp: reg { SIGN_EXT rule }

It could've been done without adding the new "regp" but having it gives the
following advantages:
- can have a closure "regp" rule that can implicitly convert reg->regp on
LP64.
- will catch bugs if the wrong type is used (loss of the upper 32bit on
LP64)
- if an exact gc is used, tracking pointer in the LIR will be a lot easier.

I used to keep the changes in sync with the ppc and sparc port but since I
cannot make sure that is works correctly I did not include those files in
the patch.

-Laurent
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