[PATCH, i386]: Further ADD/LEA improvements

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

Attached patch splits three-operand ADD instructions to clobber-less
LEA rtx and further improves a couple of add patterns. It also
introduces the same LEA avoidance alternatives to addsi_1_zext,
addhi_1_lea and addqi_1_lea patterns as were already introduced to
add{si,di}_1.

2010-08-18  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/i386.md (*add<mode>_1) <TYPE_LEA>: Split insn to lea.
	<default>:  Swap operands 1 and 2 for alternative 2 to use existing
	code to output insn mnemonic.  Fix comment.
	(*addsi_1_zext): Add r-r-0 alternative 1.
	<TYPE_LEA>: Split insn to lea.
	<default>: Handle alternative 1.
	(*addhi_1_lea): Add r-r-0 alternative 2.  Use cond RTX instead of
	multi-level if_then_else RTX to set "type" attribute.
	<default>: Handle alternative 2.
	(*addqi_1_lea): Add q-q-0 alternative 2 and r-r-0 alternative 4.
	Use cond RTX instead of multi-level if_then_else RTX to set
	"type" attribute.
	<default>: Handle alternatives 2 and 4.
	(lea splitters): Update calls to ix86_lea_for_add_ok.

	* config/i386/i386.c (ix86_lea_for_add_ok): Remove unused "code"
	argument.
	* config/i386/i386-protos.h (ix86_lea_for_add_ok): Update prototype.

Patch was bootstrapped and regression tested on x86_64-pc-linux-gnu
{,-m32} with and without --with-cpu=atom configure option. Committed
to SVN mainline.

Uros.

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