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[PATCH, AArch64] Support SBC in the backend


We couldn't generate SBC for AArch64 ... until now!

This really patch includes the main pattern, a zero_extend form
of it and a test.

Full regression testing for Linux and bare-metal passed.

OK for trunk stage-1?

Thanks,
Ian


2013-03-14  Ian Bolton  <ian.bolton@arm.com>

gcc/
	* config/aarch64/aarch64.md (*sub<mode>3_carryin): New pattern.
	(*subsi3_carryin_uxtw): Likewise.

testsuite/
	* gcc.target/aarch64/sbc.c: New test.

Attachment: aarch64-sbc.txt
Description: Text document


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