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re PR tree-optimization/20470 (Branching sequence generated for ABS(x-y)) 

2005-03-25  Pat Haugen  <pthaugen@us.ibm.com>

        PR tree-optimization/20470
        * fold-const.c (fold_cond_expr_with_comparison): Recognize/fold
        ABS(x-y).

From-SVN: r97062
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Pat Haugen 2005-03-25 20:08:30 +00:00 committed by David Edelsohn
parent d5bdce497f
commit a10d70babd
2 changed files with 16 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-03-25 Pat Haugen <pthaugen@us.ibm.com>
PR tree-optimization/20470
* fold-const.c (fold_cond_expr_with_comparison): Recognize/fold
ABS(x-y).
2005-03-25 Mike Stump <mrs@apple.com>
* config/darwin.h (ASM_OUTPUT_ALIGNED_DECL_LOCAL): Don't allow 0

12
gcc/fold-const.c
View File

@ -4187,8 +4187,16 @@ fold_cond_expr_with_comparison (tree type, tree arg0, tree arg1, tree arg2)
if ((FLOAT_TYPE_P (TREE_TYPE (arg01))
? real_zerop (arg01)
: integer_zerop (arg01))
&& TREE_CODE (arg2) == NEGATE_EXPR
&& operand_equal_p (TREE_OPERAND (arg2, 0), arg1, 0))
&& ((TREE_CODE (arg2) == NEGATE_EXPR
&& operand_equal_p (TREE_OPERAND (arg2, 0), arg1, 0))
/* In the case that A is of the form X-Y, '-A' (arg2) may
have already been folded to Y-X, check for that. */
|| (TREE_CODE (arg1) == MINUS_EXPR
&& TREE_CODE (arg2) == MINUS_EXPR
&& operand_equal_p (TREE_OPERAND (arg1, 0),
TREE_OPERAND (arg2, 1), 0)
&& operand_equal_p (TREE_OPERAND (arg1, 1),
TREE_OPERAND (arg2, 0), 0))))
switch (comp_code)
{
case EQ_EXPR: