re PR middle-end/30364 (Wrong variable ranges due to constant folding)
2007-02-28 Richard Guenther <rguenther@suse.de> PR middle-end/30364 * fold-const.c (fold_binary): Do not associate expressions with more than one variable for integer types that do not wrap. * gcc.dg/torture/pr30364-1.c: New testcase. * gcc.dg/torture/pr30364-2.c: Likewise. * gcc.dg/torture/pr30364-3.c: Likewise. From-SVN: r122414
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2007-02-28 Richard Guenther <rguenther@suse.de>
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PR middle-end/30364
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* fold-const.c (fold_binary): Do not associate expressions
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with more than one variable for integer types that do not wrap.
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2007-02-28 Sandra Loosemore <sandra@codesourcery.com>
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* builtins.c (fold_builtin_call_list, fold_builtin_call_valist):
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@ -9424,6 +9424,7 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
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{
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tree var0, con0, lit0, minus_lit0;
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tree var1, con1, lit1, minus_lit1;
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bool ok = true;
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/* Split both trees into variables, constants, and literals. Then
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associate each group together, the constants with literals,
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@ -9434,12 +9435,32 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
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var1 = split_tree (arg1, code, &con1, &lit1, &minus_lit1,
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code == MINUS_EXPR);
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/* With undefined overflow we can only associate constants
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with one variable. */
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if ((POINTER_TYPE_P (type)
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|| (INTEGRAL_TYPE_P (type) && !TYPE_OVERFLOW_WRAPS (type)))
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&& var0 && var1)
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{
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tree tmp0 = var0;
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tree tmp1 = var1;
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if (TREE_CODE (tmp0) == NEGATE_EXPR)
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tmp0 = TREE_OPERAND (tmp0, 0);
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if (TREE_CODE (tmp1) == NEGATE_EXPR)
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tmp1 = TREE_OPERAND (tmp1, 0);
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/* The only case we can still associate with two variables
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is if they are the same, modulo negation. */
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if (!operand_equal_p (tmp0, tmp1, 0))
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ok = false;
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}
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/* Only do something if we found more than two objects. Otherwise,
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nothing has changed and we risk infinite recursion. */
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if (2 < ((var0 != 0) + (var1 != 0)
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if (ok
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&& (2 < ((var0 != 0) + (var1 != 0)
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+ (con0 != 0) + (con1 != 0)
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+ (lit0 != 0) + (lit1 != 0)
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+ (minus_lit0 != 0) + (minus_lit1 != 0)))
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+ (minus_lit0 != 0) + (minus_lit1 != 0))))
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{
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/* Recombine MINUS_EXPR operands by using PLUS_EXPR. */
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if (code == MINUS_EXPR)
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@ -1,3 +1,10 @@
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2007-02-28 Richard Guenther <rguenther@suse.de>
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PR middle-end/30364
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* gcc.dg/torture/pr30364-1.c: New testcase.
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* gcc.dg/torture/pr30364-2.c: Likewise.
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* gcc.dg/torture/pr30364-3.c: Likewise.
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2007-02-28 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
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* gcc.dg/torture/builtin-frexp-1.c: On mips*-*-irix6* and
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@ -0,0 +1,19 @@
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/* { dg-do run } */
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extern void abort (void);
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int f(int a, int b)
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{
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if (a > 0x7FFFFFF0) return 0;
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if (b > 0x7FFFFFF0) return 0;
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int c = (a - 20) + (b - 20);
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return c > 0x7FFFFFF0;
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}
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int main()
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{
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if (f (0x7FFFFFF0, 41) != 1)
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abort ();
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return 0;
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}
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@ -0,0 +1,19 @@
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/* { dg-do run } */
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extern void abort (void);
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int f(unsigned int a, unsigned int b)
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{
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if (a > 0x7FFFFFF0) return 0;
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if (b > 0x7FFFFFF0) return 0;
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int c = (a - 20) + (b - 20);
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return c > 0x7FFFFFF0;
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}
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int main()
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{
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if (f (0x7FFFFFF0, 41) != 1)
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abort ();
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return 0;
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}
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@ -0,0 +1,20 @@
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/* { dg-do run } */
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/* { dg-options "-fwrapv" } */
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extern void abort (void);
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int f(int a, int b)
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{
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if (a > 0x7FFFFFF0) return 0;
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if (b > 0x7FFFFFF0) return 0;
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int c = (a - 20) + (b - 20);
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return c > 0x7FFFFFF0;
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}
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int main()
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{
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if (f (0x7FFFFFF0, 41) != 1)
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abort ();
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return 0;
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}
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