blob: 4eec245816e18335da7764772afc062d799aef58 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
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
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 beginning 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
|
