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Hello! I would like to backport recent alias fixes to correctly handle memory references with AND-alignment to 4.9 branch. These patches fix hundreds of failures in gfortran testsuite on alpha-linux-gnu due to invalid aliasing of AND-aligned memory references of two QImode flags. These patches were baking for a couple of weeks in the mainline without problems. Modulo removal of old and unnecessary functionality, these changes affect only alpha target. 2014-10-30 Uros Bizjak <ubizjak@gmail.com> Backport from mainline: 2014-10-20 Uros Bizjak <ubizjak@gmail.com> * varasm.c (const_alias_set): Remove. (init_varasm_once): Remove initialization of const_alias_set. (build_constant_desc): Do not set alias set to const_alias_set. Backport from mainline: 2014-10-14 Uros Bizjak <ubizjak@gmail.com> PR rtl-optimization/63475 * alias.c (true_dependence_1): Always use get_addr to extract true address operands from x_addr and mem_addr. Use extracted address operands to check for references with alignment ANDs. Use extracted address operands with find_base_term and base_alias_check. For noncanonicalized operands call canon_rtx with extracted address operand. (write_dependence_1): Ditto. (may_alias_p): Ditto. Remove unused calls to canon_rtx. Backport from mainline: 2014-10-10 Uros Bizjak <ubizjak@gmail.com> PR rtl-optimization/63483 * alias.c (true_dependence_1): Do not exit early for MEM_READONLY_P references when alignment ANDs are involved. (write_dependence_p): Ditto. (may_alias_p): Ditto. The complete backport was tested on alpha-linux-gnu, alphaev68-linux-gnu and x86_64-linux-gnu on 4.9 branch. OK for branch? Uros.
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