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This was noticed in PR122843 were sometimes reassociation would create the uncanonical order of operands. This fixes the problem by swapping the order as the rewrite happens. Wstringop-overflow.c needed to be xfailed since it started not to warn because well the warning is too dependent on the order of operands to MIN_EXPR. This testcase failed if we had supplied -fno-tree-reassoc before too; but nothing in the IR changes except the order of 2 operands of MIN_EXPR. I filed PR 122881 for this xfail. Bootstrapped and tested on x86_64-linux-gnu. gcc/ChangeLog: * tree-ssa-reassoc.cc (rewrite_expr_tree): Swap oe1 and oe2 if commutative code and not in canonical order. gcc/testsuite/ChangeLog: * c-c++-common/Wstringop-overflow.c: Xfail, PR 122881. Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
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