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[Xtensa] backport some fixes for 4.2.2

From: Bob Wilson <bwilson at tensilica dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 10 Sep 2007 14:45:21 -0700
Subject: [Xtensa] backport some fixes for 4.2.2

I've committed the following 2 patches for Xtensa to the 4.2 branch.

2007-05-09  Bob Wilson  <bob.wilson@acm.org>
	
	* config/xtensa/xtensa.c (xtensa_output_literal): Mask out high bits
	for floating-point values if HOST_BITS_PER_LONG > 32.  Use
	split_double instead of operand_subword.
	
2007-05-04  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/xtensa.md (adddi3, adddi_carry): Delete.
	(subdi3, subdi_carry): Delete.

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