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[fixed-point] Patch to disable association for saturating types

From: "Fu, Chao-Ying" <fu at mips dot com>
To: <gcc-patches at gcc dot gnu dot org>
Cc: "Thekkath, Radhika" <radhika at mips dot com>, "Stephens, Nigel" <nigel at mips dot com>
Date: Thu, 29 Mar 2007 16:35:29 -0700
Subject: [fixed-point] Patch to disable association for saturating types

Hi,

  This patch updates constant folding to not associate operations
for saturating types, because it affects the result.
One new test is added.  Thanks!

Regards,
Chao-ying

gcc/ChangeLog
2007-03-29  Chao-ying Fu  <fu@mips.com>

	* fold-const.c (split_tree): Support FIXED_CST.
	(operand_equal_p): Support FIXED_CST.
	(fold_binary): Make sure the type is not saturating, before
	associating operations.  Ex: A + B + C, A * B * C,
	(A1 * C1) +/- (A2 * C2).

gcc/testsuite/ChangeLog
2007-03-29  Chao-ying Fu  <fu@mips.com>

        * gcc.dg/fixed-ponit/noassoc.c: New test.

Attachment: gcc.diff
Description: gcc.diff

Attachment: noassoc.c
Description: noassoc.c

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