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# --- SDE-COPYRIGHT-NOTE-BEGIN ---# This copyright note is auto-generated by ./scripts/Create-CopyPatch.## Filename: package/.../gcc/extract_muldiv.patch# Copyright (C) 2007 The OpenSDE Project## More information can be found in the files COPYING and README.## This patch file is dual-licensed. It is available under the license the# patched project is licensed under, as long as it is an OpenSource license# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms# of the GNU General Public License as published by the Free Software# Foundation; either version 2 of the License, or (at your option) any later# version.# --- SDE-COPYRIGHT-NOTE-END ---
Take from http://gcc.gnu.org/ml/gcc-patches/2007-11/msg00948.html
2007-11-17 Richard Guenther <rguenther@suse.de>
PR middle-end/34130 * fold-const.c (extract_muldiv_1): Do not move negative constants inside ABS_EXPR.
* gcc.c-torture/execute/pr34130.c: New testcase.
Index: ./gcc/fold-const.c
===================================================================
*** ./gcc/fold-const.c (revision 130238)--- ./gcc/fold-const.c (working copy)
*************** extract_muldiv_1 (tree t, tree c, enum t*** 6095,6100 ****--- 6095,6103 ----
} break; }+ /* If the constant is negative, we cannot simplify this. */
+ if (tree_int_cst_sgn (c) == -1)
+ break;
/* FALLTHROUGH */ case NEGATE_EXPR: if ((t1 = extract_muldiv (op0, c, code, wide_type, strict_overflow_p))Index: ./gcc/testsuite/gcc.c-torture/execute/pr34130.c
===================================================================
*** ./gcc/testsuite/gcc.c-torture/execute/pr34130.c (revision 0)--- ./gcc/testsuite/gcc.c-torture/execute/pr34130.c (revision 0)
****************** 0 ****--- 1,12 ----
+ extern void abort (void);
+ int foo (int i)
+ {
+ return -2 * __builtin_abs(i - 2);
+ }
+ int main()
+ {
+ if (foo(1) != -2
+ || foo(3) != -2)
+ abort ();
+ return 0;
+ }
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