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* [gcc r13-1586] [RFA] Improve initialization of objects when the initializer has trailing zeros.
@ 2022-07-09 15:11 Jeff Law
0 siblings, 0 replies; only message in thread
From: Jeff Law @ 2022-07-09 15:11 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:46dc26fdfbf3e64f82188e21aa6a13ec23108e8e
commit r13-1586-g46dc26fdfbf3e64f82188e21aa6a13ec23108e8e
Author: Jeff Law <jeffreyalaw@gmail.com>
Date: Sat Jul 9 11:11:00 2022 -0400
[RFA] Improve initialization of objects when the initializer has trailing zeros.
gcc/
* expr.cc (store_expr): Identify trailing NULs in a STRING_CST
initializer and use clear_storage rather than copying the
NULs to the destination array.
Diff:
---
gcc/expr.cc | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/gcc/expr.cc b/gcc/expr.cc
index eb280e6cac3..f9753d48245 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -6088,6 +6088,17 @@ store_expr (tree exp, rtx target, int call_param_p,
}
str_copy_len = TREE_STRING_LENGTH (str);
+
+ /* Trailing NUL bytes in EXP will be handled by the call to
+ clear_storage, which is more efficient than copying them from
+ the STRING_CST, so trim those from STR_COPY_LEN. */
+ while (str_copy_len)
+ {
+ if (TREE_STRING_POINTER (str)[str_copy_len - 1])
+ break;
+ str_copy_len--;
+ }
+
if ((STORE_MAX_PIECES & (STORE_MAX_PIECES - 1)) == 0)
{
str_copy_len += STORE_MAX_PIECES - 1;
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2022-07-09 15:11 [gcc r13-1586] [RFA] Improve initialization of objects when the initializer has trailing zeros Jeff Law
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