re PR target/82361 (Useless "mov eax, eax" in generated code)

re PR target/82361 (Useless "mov eax, eax" in generated code)

	PR target/82361
	* config/i386/i386.md
	(TARGET_USE_8BIT_IDIV zext divmodsi4 splitter): New define_split.
	(divmodsi4_zext_1, divmodsi4_zext_2, *divmodsi4_zext_1,
	*divmodsi4_zext_2): New define_insn_and_split.
	(*divmodsi4_noext_zext_1, *divmodsi4_noext_zext_2): New define_insn.
	(TARGET_USE_8BIT_IDIV zext udivmodsi4 splitter): New define_split.
	(udivmodsi4_zext_1, udivmodsi4_zext_2, *udivmodsi4_zext_1,
	*udivmodsi4_zext_2, *udivmodsi4_pow2_zext_1, *udivmodsi4_pow2_zext_2):
	New define_insn_and_split.
	(*udivmodsi4_noext_zext_1, *udivmodsi4_noext_zext_2): New define_insn.
	* config/i386/i386.c (ix86_split_idivmod): Handle operands[0] or
	operands[1] having DImode when mode is SImode.

	* gcc.target/i386/pr82361-1.c: New test.
	* gcc.target/i386/pr82361-2.c: New test.

From-SVN: r253317