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Plan for new slot computations:
- reverse the allocation of all stack slots
so that isel slots go below spill locations
- the fast allocs must be allocated by decreasing
alignment constraints
- instead of the svec vector, we simply need two
numbers that contain the size of both the locals
and spills (stk0, stk1)
- maybe it's time to include small alignments
- use Tmp.spill == -1 to mark unallocated slots
- issue: how do we reach for the arguments?
1. an answer to that could be proper support
for memory references accesses
2. a more hackish solution is to keep using
negative numbers (but not -1) for argument
slots and add a special case in emit.c
- could be time to clean the tests on the size
of allocs (there are two and they are non-
uniform)
Layout:
---------- rbp = 0 [16]
| << padding 1 >>
| .. spills ..
| <- enforce align 16
| .. align 16 ..
| .. align 8 ..
| .. align 4 ..
| << padding 0 >>
---------- rsp = 0 [16]
padding 0: inserted at last minute by the code
emitter to respect the ABI
padding 1: inserted at the end of spill it can
be 4 or 0
Examples:
if the first local is aligned 4 of size 4, its slot
number will be set 0, to emit the proper offset to
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