[Patch] Teach genrecog/genoutput that scratch registers require write constraint modifiers
gcc/ * doc/md.texi (Modifiers): Consistently use "read/write" nomenclature rather than "input/output". * genrecog.c (constraints_supported_in_insn_p): New. (validate_pattern): If needed, also check constraints on MATCH_SCRATCH operands. * genoutput.c (validate_insn_alternatives): Catch earlyclobber operands with no '=' or '+' modifier. From-SVN: r215388
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