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fold-const.c (div_if_zero_remainder): Honor that sizetypes are sign-extending. 

2009-12-02  Richard Guenther  <rguenther@suse.de>

	* fold-const.c (div_if_zero_remainder): Honor that sizetypes
	are sign-extending.  Simplify.

From-SVN: r154926
This commit is contained in:
Richard Guenther 2009-12-02 22:49:43 +00:00 committed by Richard Biener
parent fc81a3692d
commit 793e86a71b
2 changed files with 15 additions and 14 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-12-02 Richard Guenther <rguenther@suse.de>
* fold-const.c (div_if_zero_remainder): Honor that sizetypes
are sign-extending. Simplify.
2009-12-02 Richard Henderson <rth@redhat.com>
PR tree-opt/42215

24
gcc/fold-const.c
View File

@ -881,22 +881,18 @@ div_if_zero_remainder (enum tree_code code, const_tree arg1, const_tree arg2)
HOST_WIDE_INT int1h, int2h;
unsigned HOST_WIDE_INT quol, reml;
HOST_WIDE_INT quoh, remh;
tree type = TREE_TYPE (arg1);
int uns = TYPE_UNSIGNED (type);
int uns;
/* The sign of the division is according to operand two, that
does the correct thing for POINTER_PLUS_EXPR where we want
a signed division. */
uns = TYPE_UNSIGNED (TREE_TYPE (arg2));
if (TREE_CODE (TREE_TYPE (arg2)) == INTEGER_TYPE
&& TYPE_IS_SIZETYPE (TREE_TYPE (arg2)))
uns = false;
int1l = TREE_INT_CST_LOW (arg1);
int1h = TREE_INT_CST_HIGH (arg1);
/* &obj[0] + -128 really should be compiled as &obj[-8] rather than
&obj[some_exotic_number]. */
if (POINTER_TYPE_P (type))
{
uns = false;
type = signed_type_for (type);
fit_double_type (int1l, int1h, &int1l, &int1h,
type);
}
else
fit_double_type (int1l, int1h, &int1l, &int1h, type);
int2l = TREE_INT_CST_LOW (arg2);
int2h = TREE_INT_CST_HIGH (arg2);
@ -905,7 +901,7 @@ div_if_zero_remainder (enum tree_code code, const_tree arg1, const_tree arg2)
if (remh != 0 || reml != 0)
return NULL_TREE;
return build_int_cst_wide (type, quol, quoh);
return build_int_cst_wide (TREE_TYPE (arg1), quol, quoh);
}
/* This is nonzero if we should defer warnings about undefined