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[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.
This commit is contained in:
Jeff Law 2022-07-09 11:11:00 -04:00
parent 8f1802003d
commit 46dc26fdfb
1 changed files with 11 additions and 0 deletions
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11
gcc/expr.cc
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@ -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;