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| author | Richard Biener <rguenther@suse.de> | 2020-04-14 13:16:25 +0200 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2020-04-15 09:19:26 +0200 |
| commit | e71b408aa242ffc76ffd19ebcdbd40279a1d9349 (patch) | |
| tree | 19da1ef7ccdb744483811f95be28b003256bd893 | |
| parent | 5b6551bc6049b34425fb96e8d91eb15b04f87f62 (diff) | |
| download | gcc-e71b408aa242ffc76ffd19ebcdbd40279a1d9349.zip gcc-e71b408aa242ffc76ffd19ebcdbd40279a1d9349.tar.gz gcc-e71b408aa242ffc76ffd19ebcdbd40279a1d9349.tar.bz2 | |
middle-end/94539 - void * aliases every other pointer
This makes same_type_for_tbaa_p conservative in the same way
get_alias_set is about void * which we allow to alias all other
pointers.
2020-04-15 Richard Biener <rguenther@suse.de>
PR middle-end/94539
* tree-ssa-alias.c (same_type_for_tbaa): Defer to
alias_sets_conflict_p for pointers.
* gcc.dg/alias-14.c: Make dg-do run.
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/alias-14.c | 2 | ||||
| -rw-r--r-- | gcc/tree-ssa-alias.c | 11 |
4 files changed, 22 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3c6a45e..2d6c5c8 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2020-04-15 Richard Biener <rguenther@suse.de> + + PR middle-end/94539 + * tree-ssa-alias.c (same_type_for_tbaa): Defer to + alias_sets_conflict_p for pointers. + 2020-04-14 Max Filippov <jcmvbkbc@gmail.com> PR target/94584 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 69f9b93..0e4eea3 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2020-04-15 Richard Biener <rguenther@suse.de> + + PR middle-end/94539 + * gcc.dg/alias-14.c: Make dg-do run. + 2020-04-13 Max Filippov <jcmvbkbc@gmail.com> PR target/94584 diff --git a/gcc/testsuite/gcc.dg/alias-14.c b/gcc/testsuite/gcc.dg/alias-14.c index 1ca1c09..24f0d1c 100644 --- a/gcc/testsuite/gcc.dg/alias-14.c +++ b/gcc/testsuite/gcc.dg/alias-14.c @@ -1,4 +1,4 @@ -/* { dg-do compile } */ +/* { dg-do run } */ /* { dg-options "-O2" } */ #include <stddef.h> void *a; diff --git a/gcc/tree-ssa-alias.c b/gcc/tree-ssa-alias.c index df9ba0d..ede4f19 100644 --- a/gcc/tree-ssa-alias.c +++ b/gcc/tree-ssa-alias.c @@ -839,7 +839,16 @@ same_type_for_tbaa (tree type1, tree type2) would mean that conversions between them are useless, whereas they are not (e.g. type and subtypes can have different modes). So, in the end, they are only guaranteed to have the same alias set. */ - if (get_alias_set (type1) == get_alias_set (type2)) + alias_set_type set1 = get_alias_set (type1); + alias_set_type set2 = get_alias_set (type2); + if (set1 == set2) + return -1; + + /* Pointers to void are considered compatible with all other pointers, + so for two pointers see what the alias set resolution thinks. */ + if (POINTER_TYPE_P (type1) + && POINTER_TYPE_P (type2) + && alias_sets_conflict_p (set1, set2)) return -1; /* The types are known to be not equal. */ |