Pad short functions with NOPs for Atom.

Pad short functions with NOPs for Atom.

gcc/

2010-09-17  H.J. Lu  <hongjiu.lu@intel.com>
	    Richard Henderson  <rth@redhat.com>

	* config/i386/i386.c (initial_ix86_tune_features): Add
	X86_TUNE_PAD_SHORT_FUNCTION.
	(ix86_code_end): Pad with 8 NOPs for TARGET_PAD_SHORT_FUNCTION.
	(ix86_count_insn): New.
	(ix86_pad_short_function): Likewise.
	(ix86_reorg): Support TARGET_PAD_SHORT_FUNCTION.

	* config/i386/i386.h (ix86_tune_indices): Add
	X86_TUNE_PAD_SHORT_FUNCTION.
	(TARGET_PAD_SHORT_FUNCTION): New.

	* config/i386/i386.md (UNSPEC_NOPS): New.
	(nops): Likewise.

gcc/testsuite/

2010-09-17  H.J. Lu  <hongjiu.lu@intel.com>

	* gcc.target/i386/pad-1.c: New.
	* gcc.target/i386/pad-2.c: Likewise.
	* gcc.target/i386/pad-3.c: Likewise.
	* gcc.target/i386/pad-4.c: Likewise.
	* gcc.target/i386/pad-5a.c: Likewise.
	* gcc.target/i386/pad-5b.c: Likewise.
	* gcc.target/i386/pad-6a.c: Likewise.
	* gcc.target/i386/pad-6b.c: Likewise.
	* gcc.target/i386/pad-7.c: Likewise.
	* gcc.target/i386/pad-8.c: Likewise.
	* gcc.target/i386/pad-9.c: Likewise.
	* gcc.target/i386/pad-10.c: Likewise.

Co-Authored-By: Richard Henderson <rth@redhat.com>
From-SVN: r164379