awk: speed improvementsawk_faster

Improve performance in certain cases at the cost of an additional
144 bytes in the binary.

- Reinstate (and fix) the original code to speed up assignment of a
  temporary string to a variable.

- Replace use of xasprintf() for string concatentation with explicit
  string manipulation.  This could be faster still if Windows had an
  optimised stpcpy().

The enhancement is not enabled by default.

This test case:

   BEGIN{while(++i<30000) s=s i}

is 18 times faster.  The less extreme:

   BEGIN{while(++i<1000000) s="abc " i}

is 30% faster.

See GitHub issue #193.

0 files changed, 0 insertions, 0 deletions