diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2018-03-16 08:06:41 +0000 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2018-03-16 08:06:41 +0000 |
| commit | 883204452b19b92cf969590986bdc3dd391291ca (patch) | |
| tree | 403b3c0cc2e831ced8bc874ee678a2f81afae208 /gcc/tree-ssa-reassoc.c | |
| parent | 5f0887476adae7adbd12ce4d72af098eda0b4895 (diff) | |
PR tree-optimization/84841
* tree-ssa-reassoc.c (INTEGER_CONST_TYPE): Change to 1 << 4 from
1 << 3.
(FLOAT_ONE_CONST_TYPE): Define.
(constant_type): Return FLOAT_ONE_CONST_TYPE for -1.0 and 1.0.
(sort_by_operand_rank): Put entries with higher constant_type last
rather than first to match comments.
* gcc.dg/pr84841.c: New test.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@258586 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-reassoc.c')
| -rw-r--r-- | gcc/tree-ssa-reassoc.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c index f41b1207ed8..0e59bb595ea 100644 --- a/gcc/tree-ssa-reassoc.c +++ b/gcc/tree-ssa-reassoc.c @@ -470,7 +470,8 @@ get_rank (tree e) /* We want integer ones to end up last no matter what, since they are the ones we can do the most with. */ -#define INTEGER_CONST_TYPE 1 << 3 +#define INTEGER_CONST_TYPE 1 << 4 +#define FLOAT_ONE_CONST_TYPE 1 << 3 #define FLOAT_CONST_TYPE 1 << 2 #define OTHER_CONST_TYPE 1 << 1 @@ -482,7 +483,14 @@ constant_type (tree t) if (INTEGRAL_TYPE_P (TREE_TYPE (t))) return INTEGER_CONST_TYPE; else if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (t))) - return FLOAT_CONST_TYPE; + { + /* Sort -1.0 and 1.0 constants last, while in some cases + const_binop can't optimize some inexact operations, multiplication + by -1.0 or 1.0 can be always merged with others. */ + if (real_onep (t) || real_minus_onep (t)) + return FLOAT_ONE_CONST_TYPE; + return FLOAT_CONST_TYPE; + } else return OTHER_CONST_TYPE; } @@ -504,7 +512,7 @@ sort_by_operand_rank (const void *pa, const void *pb) if (oea->rank == 0) { if (constant_type (oeb->op) != constant_type (oea->op)) - return constant_type (oeb->op) - constant_type (oea->op); + return constant_type (oea->op) - constant_type (oeb->op); else /* To make sorting result stable, we use unique IDs to determine order. */ |