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| author | Jakub Jelinek <jakub@redhat.com> | 2021-10-28 20:10:15 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2021-10-28 20:10:15 +0200 |
| commit | 6123b998b185572abac7d7224b34f03955bb91a2 (patch) | |
| tree | 37da95c6b820de59031915d527b40bb48263829e /gcc/fold-const.h | |
| parent | d123daec0c237533cf974334d98bc6d357d4273e (diff) | |
| download | gcc-6123b998b185572abac7d7224b34f03955bb91a2.zip gcc-6123b998b185572abac7d7224b34f03955bb91a2.tar.gz gcc-6123b998b185572abac7d7224b34f03955bb91a2.tar.bz2 | |
match.pd: Optimize MIN_EXPR <addr1, addr2> etc. addr1 < addr2 would be simplified [PR102951]
This patch outlines the decision whether address comparison can be folded
or not from the match.pd simple comparison simplification and uses it
both there and in a new minmax simplification, such that we fold e.g.
MAX (&a[2], &a[1]) etc.
Some of the Wstringop-overflow-62.c changes might look weird, but that
seems to be mainly due to gimple_fold_builtin_memset not bothering to
copy over location, will fix that incrementally.
2021-10-28 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/102951
* fold-const.h (address_compare): Declare.
* fold-const.c (address_compare): New function.
* match.pd (cmp (convert1?@2 addr@0) (convert2? addr@1)): Use
address_compare helper.
(minmax cmp (convert1?@2 addr@0) (convert2?@3 addr@1)): New
simplification.
* gcc.dg/tree-ssa/pr102951.c: New test.
* gcc.dg/Wstringop-overflow-62.c: Adjust expected diagnostics.
Diffstat (limited to 'gcc/fold-const.h')
| -rw-r--r-- | gcc/fold-const.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/fold-const.h b/gcc/fold-const.h index 7bac84b..fed4768 100644 --- a/gcc/fold-const.h +++ b/gcc/fold-const.h @@ -213,6 +213,8 @@ extern bool negate_mathfn_p (combined_fn); extern const char *getbyterep (tree, unsigned HOST_WIDE_INT *); extern const char *c_getstr (tree); extern wide_int tree_nonzero_bits (const_tree); +extern int address_compare (tree_code, tree, tree, tree, tree &, tree &, + poly_int64 &, poly_int64 &, bool); /* Return OFF converted to a pointer offset type suitable as offset for POINTER_PLUS_EXPR. Use location LOC for this conversion. */ |