re PR target/30315 (optimize unsigned-add overflow test on x86 to use cpu flags from...

re PR target/30315 (optimize unsigned-add overflow test on x86 to use cpu flags from addl)

	PR target/30315
	* config/i386/i386.h (CANONICALIZE_COMPARISON): New.
	* config/i386/i386.md (plusminus)(addsub)(SWI): New.
	(*<addsub><mode>3_cc_overflow): New.
	(*add<mode>3_cconly_overflow): New.
	(*sub<mode>3_cconly_overflow): New.
	(*<addsub>si3_zext_cc_overflow): New.
	* config/i386/predicates.md (fcmov_comparison_operator): Accept
	CCCmode for LTU, GTU, LEU and GEU.
	(ix86_comparison_operator): Likewise.
	(ix86_carry_flag_operator): Carry flag is set if LTU or GTU in CCCmode.
	* gcc/config/i386/i386.c (put_condition_code): Support CCCmode.
	(ix86_cc_mode): Use CCCmode when testing for overflow of PLUS
	or MINUS expressions.

testsuite/
	PR target/30315
	* gcc.target/i386/pr30315.c: New.

From-SVN: r127481