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Add more tests. Apparently our algorithm does not do a good job.

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Chris Pressey 2018-04-06 13:24:04 +01:00
parent 350bab42d7
commit a5d946734a
1 changed files with 79 additions and 4 deletions
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83
tests/SixtyPical Fallthru.md
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@ -81,7 +81,7 @@ through to it.
= ]
= ]
If main does a `goto foo`, then it can fall through to `foo`.
If `main` does a `goto foo`, then it can fall through to `foo`.
| define foo routine trashes a, z, n
| {
@ -102,9 +102,6 @@ If main does a `goto foo`, then it can fall through to `foo`.
More than one routine can fall through to a routine. We pick one
of them to fall through, when selecting the order of routines.
Also note, `main` is always serialized first, so that the entry
point of the entire program appears at the beginning of the code.
| define foo routine trashes a, z, n
| {
| ld a, 0
@ -130,6 +127,29 @@ point of the entire program appears at the beginning of the code.
= ]
= ]
Because `main` is always serialized first (so that the entry
point of the entire program appears at the beginning of the code),
nothing ever falls through to `main`.
| define foo routine trashes a, z, n
| {
| ld a, 0
| goto main
| }
|
| define main routine trashes a, z, n
| {
| ld a, 1
| }
= [
= [
= "main"
= ],
= [
= "foo"
= ]
= ]
There is nothing stopping two routines from tail-calling each
other, but we will only be able to make one of them, at most,
fall through to the other.
@ -226,6 +246,61 @@ because we don't necessarily know what actual routine the vector contains.
= ]
= ]
Our algorithm might not be strictly optimal, but it does a good job.
| define r1 routine trashes a, z, n
| {
| ld a, 0
| goto r2
| }
|
| define r2 routine trashes a, z, n
| {
| ld a, 0
| goto r3
| }
|
| define r3 routine trashes a, z, n
| {
| ld a, 0
| goto r4
| }
|
| define r4 routine trashes a, z, n
| {
| ld a, 0
| }
|
| define r5 routine trashes a, z, n
| {
| ld a, 0
| goto r6
| }
|
| define r6 routine trashes a, z, n
| {
| ld a, 0
| goto r3
| }
|
| define main routine trashes a, z, n
| {
| goto r1
| }
= [
= [
= "main",
= "r1",
= "r2",
= "r3",
= "r4"
= ],
= [
= "r5",
= "r6"
= ]
= ]
-> Tests for functionality "Compile SixtyPical program with fallthru optimization"
Basic test for actually applying this optimization when compiling SixtyPical programs.