mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-20 11:54:02 +00:00
796f7f7436
Estimated hours taken: 16 Fix a bug which caused the code generator to fail on certain examples involving predicates with determinism `erroneous'. compiler/inst_match.m: Change `inst_is_bound' so that it succeeds for `not_reached' insts. This change is so that the behaviour of the predicate matches the documentation, and so that it is consistent with the behaviour of `inst_is_ground'. compiler/liveness.m: When computing the value-giving occurrences, check explicitly for unreachable instmaps. This is necessary to handle the above change to `inst_is_bound'. Fix a bug in detect_deadness: it was applying the deaths before the births, but it should be done in the other order. Normally deaths must be applied before births, but in detect_deadness we are traversing the goal backwards, so we must apply births first and then deaths. The old solution of just cancelling out any vars that occur in both the post-death and post-birth set was not quite right; instead we just need to apply them in the correct order. compiler/code_info.m: Change the code so that it applies the pre/post deaths before applying the corresponding births. compiler/live_vars.m: compiler/store_alloc.m: compiler/hlds_goal.m: Add some comments about making sure we always apply the deaths before applying the births. (The code here was already correct, I just added some documentation.) compiler/hlds_out.m: Print out the pre/post deaths before the pre/post births, so that the order that they are printed out in matches the order in which they should be applied. tests/hard_coded/Mmake: tests/hard_coded/erroneous_liveness.m: tests/hard_coded/erroneous_liveness.exp: tests/hard_coded/erroneous_liveness.inp: Regression test for the above-mentioned bug fix.
2 lines
17 B
Plaintext
2 lines
17 B
Plaintext
Total cost was 0
|