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| author | Richard Sandiford <richard.sandiford@arm.com> | 2016-12-24 14:30:18 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2016-12-24 14:30:18 +0000 |
| commit | e7960be786ae786c6fc2ec48480bfb279c6d99e2 (patch) | |
| tree | c7c60297d704befab04918f7214aaabe3e997af7 /gcc/gimple-expr.h | |
| parent | 284a35df5d759e4ed0c7e03b5354dbfafddd67df (diff) | |
Make it cheaper to test whether an SSA name is a virtual operand
virtual_operand_p handled SSA names by looking at the flags of the
underlying variable. This seems to be a relatively common source
of cache misses, mainly because virtual_operand_p is the first thing
tested by is_gimple_reg.
This patch caches the information in the SSA name itself. Several
flags seem to be free so the patch arbitrarily uses public_flag.
Tested on aarch64-linux-gnu and x86_64-linux-gnu. It improves
compile time by a small (<1%) but reproducable amount on the
tests I've tried.
gcc/
* tree-core.h (tree_base): Document the meaning of public_flag
for SSA names.
* tree.h (SSA_NAME_IS_VIRTUAL_OPERAND): New macro.
(SET_SSA_NAME_VAR_OR_IDENTIFIER): Record whether the variable
is a virtual operand.
* gimple-expr.h (virtual_operand_p): Use SSA_NAME_IS_VIRTUAL_OPERAND.
From-SVN: r243916
Diffstat (limited to 'gcc/gimple-expr.h')
| -rw-r--r-- | gcc/gimple-expr.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/gcc/gimple-expr.h b/gcc/gimple-expr.h index f2ccd29a94a..faf4c53db30 100644 --- a/gcc/gimple-expr.h +++ b/gcc/gimple-expr.h @@ -105,11 +105,7 @@ static inline bool virtual_operand_p (tree op) { if (TREE_CODE (op) == SSA_NAME) - { - op = SSA_NAME_VAR (op); - if (!op) - return false; - } + return SSA_NAME_IS_VIRTUAL_OPERAND (op); if (TREE_CODE (op) == VAR_DECL) return VAR_DECL_IS_VIRTUAL_OPERAND (op); |