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fold-const.c (fold): The transformation "X % -Y" -> "X % Y" is only valid for TRUNC_MOD_EXPR. 

* fold-const.c (fold) <TRUNC_MOD_EXPR>: The transformation "X % -Y"
	-> "X % Y" is only valid for TRUNC_MOD_EXPR.

From-SVN: r85443
This commit is contained in:
Roger Sayle 2004-08-02 17:11:42 +00:00 committed by Roger Sayle
parent 25b656e733
commit 3159762032
2 changed files with 11 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-08-02 Roger Sayle <roger@eyesopen.com>
* fold-const.c (fold) <TRUNC_MOD_EXPR>: The transformation "X % -Y"
-> "X % Y" is only valid for TRUNC_MOD_EXPR.
2004-08-02 Gabriel Dos Reis <gdr@integrable-solutions.net>
* vec.h (DEF_VEC_P): Add proper cast to uses of vec_o_reserve and

10
gcc/fold-const.c
View File

@ -7624,8 +7624,9 @@ fold (tree expr)
fold_convert (type, arg0), mask));
}
/* X % -C is the same as X % C (for all rounding moduli). */
if (!TYPE_UNSIGNED (type)
/* X % -C is the same as X % C. */
if (code == TRUNC_MOD_EXPR
&& !TYPE_UNSIGNED (type)
&& TREE_CODE (arg1) == INTEGER_CST
&& TREE_INT_CST_HIGH (arg1) < 0
&& !flag_trapv
@ -7634,8 +7635,9 @@ fold (tree expr)
return fold (build2 (code, type, fold_convert (type, arg0),
fold_convert (type, negate_expr (arg1))));
/* X % -Y is the same as X % Y (for all rounding moduli). */
if (!TYPE_UNSIGNED (type)
/* X % -Y is the same as X % Y. */
if (code == TRUNC_MOD_EXPR
&& !TYPE_UNSIGNED (type)
&& TREE_CODE (arg1) == NEGATE_EXPR
&& !flag_trapv)
return fold (build2 (code, type, fold_convert (type, arg0),