Add -m8bit-idiv for x86.

Add -m8bit-idiv for x86.

gcc/

2010-09-16  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386-protos.h (ix86_split_idivmod): New prototype.

	* config/i386/i386.c (predict_jump): Add prototype.
	(flag_opts): Add -m8bit-idiv.
	(ix86_split_idivmod): New.

	* config/i386/i386.md (UNSPEC_DIV_ALREADY_SPLIT): New.
	Add 2 splitters for SI/DI mode divide.
	(divmod<mode>4_1): New pattern.
	(udivmod<mode>4_1): Likewise.
	(testdi_ccno_1): Likewise.

	* config/i386/i386.opt (m8bit-idiv): New.

	* doc/invoke.texi: Document -m8bit-idiv.

gcc/testsuite/

2010-09-16  H.J. Lu  <hongjiu.lu@intel.com>

	* gcc.target/i386/divmod-1.c: New.
	* gcc.target/i386/divmod-2.c: Likewise.
	* gcc.target/i386/divmod-3.c: Likewise.
	* gcc.target/i386/divmod-4.c: Likewise.
	* gcc.target/i386/divmod-4a.c: Likewise.
	* gcc.target/i386/divmod-5.c: Likewise.
	* gcc.target/i386/divmod-6.c: Likewise.
	* gcc.target/i386/divmod-7.c: Likewise.
	* gcc.target/i386/divmod-8.c: Likewise.
	* gcc.target/i386/udivmod-1.c: Likewise.
	* gcc.target/i386/udivmod-2.c: Likewise.
	* gcc.target/i386/udivmod-3.c: Likewise.
	* gcc.target/i386/udivmod-4.c: Likewise.
	* gcc.target/i386/udivmod-4a.c: Likewise.
	* gcc.target/i386/udivmod-5.c: Likewise.
	* gcc.target/i386/udivmod-6.c: Likewise.
	* gcc.target/i386/udivmod-7.c: Likewise.
	* gcc.target/i386/udivmod-8.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@164346 138bc75d-0d04-0410-961f-82ee72b054a4