[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.
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11
gcc/expr.cc
11
gcc/expr.cc
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@ -6088,6 +6088,17 @@ store_expr (tree exp, rtx target, int call_param_p,
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}
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str_copy_len = TREE_STRING_LENGTH (str);
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/* Trailing NUL bytes in EXP will be handled by the call to
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clear_storage, which is more efficient than copying them from
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the STRING_CST, so trim those from STR_COPY_LEN. */
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while (str_copy_len)
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{
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if (TREE_STRING_POINTER (str)[str_copy_len - 1])
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break;
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str_copy_len--;
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}
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if ((STORE_MAX_PIECES & (STORE_MAX_PIECES - 1)) == 0)
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{
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str_copy_len += STORE_MAX_PIECES - 1;
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