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re PR tree-optimization/19944 (cris-elf testsuite failures: gcc.dg/pr15784-1.c, gcc.dg/pr15784-2.c)

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2005-02-13  James A. Morrison  <phython@gcc.gnu.org>

       PR tree-optimization/19944
       * fold-const.c (fold): Re-add ABS_EXPR folding.

From-SVN: r95002
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James A. Morrison 2005-02-14 02:27:18 +00:00
parent d9099901ad
commit 623049aa3c
2 changed files with 25 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2005-02-13 James A. Morrison <phython@gcc.gnu.org>
PR tree-optimization/19944
* fold-const.c (fold): Re-add ABS_EXPR folding.
2005-02-13 David Edelsohn <edelsohn@gnu.org>
PR target/19019

20
gcc/fold-const.c
View file

@ -8973,6 +8973,26 @@ fold (tree expr)
build2 (LE_EXPR, type,
TREE_OPERAND (arg0, 0), arg1)));
/* Convert ABS_EXPR<x> >= 0 to true. */
else if (code == GE_EXPR
&& tree_expr_nonnegative_p (arg0)
&& (integer_zerop (arg1)
|| (! HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0)))
&& real_zerop (arg1))))
return omit_one_operand (type, integer_one_node, arg0);
/* Convert ABS_EXPR<x> < 0 to false. */
else if (code == LT_EXPR
&& tree_expr_nonnegative_p (arg0)
&& (integer_zerop (arg1) || real_zerop (arg1)))
return omit_one_operand (type, integer_zero_node, arg0);
/* Convert ABS_EXPR<x> == 0 or ABS_EXPR<x> != 0 to x == 0 or x != 0. */
else if ((code == EQ_EXPR || code == NE_EXPR)
&& TREE_CODE (arg0) == ABS_EXPR
&& (integer_zerop (arg1) || real_zerop (arg1)))
return fold (build2 (code, type, TREE_OPERAND (arg0, 0), arg1));
/* If this is an EQ or NE comparison with zero and ARG0 is
(1 << foo) & bar, convert it to (bar >> foo) & 1. Both require
two operations, but the latter can be done in one less insn