tree c92f8ccffd491650b6b487156c4ddb5fec2442aa
parent a21a6092cfc0c7e7cb8c0273e5f94d54c0e0eabd
author Rich Felker <dalias@aerifal.cx> 1539884225 -0400
committer Rich Felker <dalias@aerifal.cx> 1539884485 -0400

optimize internal putc_unlocked macro used in putc

to check whether flush due to line buffering is needed, the int-type
character argument must be truncated to unsigned char for comparison.
if the original value is subsequently passed to __overflow, it must be
preserved, adding to register pressure. since it doesn't matter,
truncate all uses so the original value is no longer live.